CN103872425A - Tension cable close constant tension compensation device - Google Patents

Abstract

The invention relates to a nearly constant tension compensation device for tension cables, comprising a first connecting piece, a sliding sleeve, a sliding column, a compression spring, two stop pins and a second connecting piece, wherein the first connecting piece is connected to the rigid structure of the antenna, and the second connecting piece The second connecting piece is connected to the antenna tension cable, and the first connecting piece is connected to the sliding sleeve, so that the sliding sleeve can rotate freely around the joint to meet the angle change when the antenna tension cable is adjusted, and one end of the compression spring is fixedly installed on the sliding column. The large-diameter section is set on the small-diameter section of the sliding column. The sliding column and the compression spring are assembled inside the sliding sleeve. The two stop pins are fixedly connected with the sliding column and can slide freely in the sliding groove of the sliding sleeve. , the second connecting piece is fixedly connected to one end of the small-diameter section of the sliding column, so that the change in the tension of the antenna tension cable is transmitted to the compression spring. Stability of cable tension.

Description

A near-constant tension compensation device for tension cables

technical field

The invention relates to a near-constant tension compensation device for a tension cable. The invention provides a way to maintain the stability of the pretension of the antenna tension cable under the condition of space temperature variation, and belongs to the technical field of mechanisms.

Background technique

The cable net system is an important part and key component of a large-scale mesh deployable antenna. It is mainly composed of flexible tension cables, which are connected to the main body of the antenna structure in a certain way, and the required antenna profile is formed through design.

Among them, the stability of the pretension of the tension cable in the cable net system has a great influence on the forming and maintenance of the antenna profile, the stiffness of the cable net system, the gravity deformation of the cable net system, the temperature deformation of the cable net system, and the deployment power of the antenna. The stability of pretension is one of the important performance indexes of tension cable net.

At present, the connection of antenna tension cables at home and abroad is mainly connected directly to the antenna structure. The tension changes greatly due to the influence of temperature in space work, which leads to the deterioration of the stability of the antenna cable network system and the antenna profile.

Contents of the invention

The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art, and provide a tension cable near-constant tension compensation device, which can overcome the huge change in the tension of the tension cable under the change of space temperature, and can maintain the stability of the tension of the tension cable , and the compensation device has a simple structure and high reliability.

Above-mentioned purpose of the present invention is mainly achieved through the following technical solutions:

A near-constant tension compensation device for tension cables, comprising a first connecting piece, a sliding sleeve, a sliding post, a compression spring, two stop pins and a second connecting piece, wherein the first connecting piece is used to connect the rigid structure of the antenna, and the second The connecting piece is used to connect the antenna tension cable, and the first connecting piece is connected to the sliding sleeve, so that the sliding sleeve can rotate freely around the first connecting piece to meet the angle change when the antenna tension cable is adjusted, and one end of the compression spring is fixed Installed on the large-diameter section of the sliding column and sleeved on the small-diameter section of the sliding column. The sliding column and the compression spring are coaxially fixedly connected and then assembled into the sliding sleeve. The two stop pins are fixedly connected to the sliding column and can be used in The stopper pin sliding groove provided by the sliding sleeve slides freely, the gap fit between the compression spring and the sliding sleeve, the compression spring and the small diameter section of the sliding column, the second connecting piece and the small diameter section of the sliding column One end is fixedly connected so that changes in the tension of the antenna tension cable are transmitted to the compression spring.

In the tension cable near-constant tension compensation device, the first connecting piece includes two lugs with through holes, and the first connecting piece is connected by pins between the two lugs with through holes and the sliding sleeve. , so that the sliding sleeve can freely rotate around the first connecting piece.

In the tension cable near-constant tension compensation device, the sliding sleeve can freely rotate around the first connecting member within the range of -90° to 90°.

In the above tension cable nearly constant tension compensating device, the second connecting piece includes a screw and two mutually perpendicular lugs with a through hole, the screw passes through the through hole of one of the lugs and is fixed on the lug, and the sliding column is small One end of the diameter section is provided with a terminal screw hole, which is fixedly connected with the screw through threads.

In the above-mentioned near-constant tension compensation device for tension cables, the materials of the first connecting piece, the sliding sleeve, the sliding column and the second connecting piece are all made of titanium alloy or aluminum alloy.

In the above tension cable near-constant tension compensation device, the outer diameter of the sliding sleeve is D _t and the inner diameter is d _t ; the diameter of the large diameter section of the sliding column is D _z , and the diameter of the small diameter section is d _z ; the middle diameter of the compression spring is The diameter is D and the wire diameter is d, then the following relationship is satisfied:

$\left\{\begin{array}{c}{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; z</span>}}<span\; class="notranslate">\; <</span>\mathrm{<span\; class="notranslate">\; D.</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; d</span>}\\ {\mathrm{<span\; class="notranslate">\; D.</span>}}_{\mathrm{<span\; class="notranslate">\; z</span>}}<span\; class="notranslate">\; ></span>\mathrm{<span\; class="notranslate">\; D.</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; d</span>}\\ {\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; t</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; min</span>}}<span\; class="notranslate">\; \&le;</span>{\mathrm{<span\; class="notranslate">\; D.</span>}}_{\mathrm{<span\; class="notranslate">\; t</span>}}<span\; class="notranslate">\; \&le;</span>{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; t</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; max</span>}}\\ {\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; t</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; D.</span>}}_{\mathrm{<span\; class="notranslate">\; z</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 0.04</span>}\mathrm{<span\; class="notranslate">\; mm</span>}<span\; class="notranslate">\; ~</span>\mathrm{<span\; class="notranslate">\; 0.12</span>}\mathrm{<span\; class="notranslate">\; mm</span>}\end{array}\right.<span\; class="notranslate">\; ;</span>$

Among them: h _min is the minimum value of the sliding sleeve wall thickness, h _max is the maximum value of the sliding sleeve wall thickness.

In the above-mentioned near-constant tension compensation device for tension cables, the minimum value h _min of the wall thickness of the sliding sleeve is 0.8 mm, and the maximum value h _max of the wall thickness of the sliding sleeve is 1.2 mm.

In the tension cable near-constant tension compensation device described above, the stiffness of the compression spring is 0.2N/m-1N/m, and the length of the large-diameter section of the sliding column is 2mm-10mm; the inner diameter of the sliding sleeve and the surface of the sliding column are rough The degree parameter value is not greater than 1.6.

Compared with the prior art, the present invention has the following beneficial effects:

(1) In view of the huge change in the tension of the tension cable under the change of the space temperature, which leads to the relaxation of the tension cable and the deterioration of the antenna profile, the present invention innovatively designs a near-constant tension compensation device for the tension cable. The compensation device is The combined structure formed by the first connecting piece, the second connecting piece, the sliding sleeve, the sliding column and the compression spring, wherein the first connecting piece is connected to the rigid structure of the antenna, and the second connecting piece is connected to the tension cable. The compensation device is simple in structure and ingenious in design , which can overcome the huge change of the tension of the tension cable under the change of the space temperature, and can maintain the stability of the tension of the tension cable;

(2), in the tension cable near-constant tension compensation device of the present invention, the change of the tension cable length is reflected by the change of the compression amount of the compression spring, and the tension change amount of the tension cable is reflected by the elastic force change amount of the compression spring, because the compression spring The stiffness of the tension cable can be much smaller than the stiffness of the tension cable by design, so the change of the tension cable tension is very small at this time, almost negligible, and the purpose of tension compensation is achieved. The maintenance of cable pretension stability provides a tension compensation device with simple structure and reliable operation, which overcomes the shortcomings caused by the hard connection between the tension cable and the antenna structure.

Description of drawings

Fig. 1 is the structural exploded view of tension cable nearly constant tension compensation device of the present invention;

Fig. 2 is the structural assembly drawing of tension cable nearly constant tension compensation device of the present invention;

Fig. 3 is a schematic diagram of the installation position of the tension cable near-constant tension compensation device on the antenna of the present invention;

Fig. 4 is a schematic diagram of the state of the near-constant tension compensation device of the present invention under the tension cable relaxation state;

Fig. 5 is a schematic diagram of the state of the near-constant tension compensation device in the tensioned state of the tension cable according to the present invention.

Detailed ways:

Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

Fig. 1 is an exploded view of the structure of the tension cable nearly constant tension compensation device of the present invention, and Fig. 2 is a structural assembly diagram of the tension cable nearly constant tension compensation device of the present invention. It can be seen from the figure that the compensating device is composed of six parts: a first connecting piece 1, a sliding sleeve 2, a sliding column 3, a compression spring 4, two stop pins 5 and a second connecting piece 6, wherein the first connecting piece 1 is used to connect The external antenna rigid structure, the second connecting piece 6 is used to connect the external antenna tension cable, the specific connection relationship of the compensation device is as follows:

The first connecting piece 1 includes two lugs with through holes, and the first connecting piece 1 is connected with the sliding sleeve 2 by means of pins through the two lugs with through holes, so that the sliding sleeve 2 can be wound around The first connecting part 1 is free to rotate within the range of -90° to 90° (the position of 0° is shown in FIG. 2 ). It is used to meet the needs of angle change when the tension cable is adjusted. The sliding sleeve 2 is a cylindrical structure with an open inner diameter at one end and an interface connected with the antenna structure connector 1, allowing the sliding column 3 and the compression spring 4 to be loaded from this end, and the other end is a diameter smaller than the sliding sleeve 2. The inner diameter and the circular hole concentric with the inner diameter are used to support the deformation of the compression spring 4 and slide with the sliding column 3, and there are sliding grooves 9 along the axial direction on both sides. The sliding column 3 is a stepped cylindrical structure with a large diameter at one end, which fits with the inner diameter of the sliding sleeve 2 in clearance, and there are mutually symmetrical stop pin mounting holes on it, and the rest is a cylinder with a smaller diameter, which can be used for compression The inner diameter of the spring 4 and the circular hole of the sliding sleeve 2 are clearance-fitted and can slide freely. There is a threaded hole in the center along the axis at the end, which can be connected with the second connecting piece 6 by screws.

The compression spring 4 is coaxially fixed on the large-diameter section of the sliding column 3, and is set on the small-diameter section of the sliding column 3. The sliding column 3 and the compression spring 4 are coaxially fixedly connected and then assembled into the sliding sleeve 2. , and the sliding sleeve 2 are connected by a sliding rod and realize a clearance fit, specifically, the outer diameter of the compression spring 4 and the inner diameter of the sliding sleeve 2 have a clearance fit, and the inner diameter and the small diameter section of the sliding column 3 have a clearance fit, which can withstand the influence of external factors Under the free deformation, under the condition of the same deformation length, the change of the elastic force of the compression spring 4 is much smaller than the change of the tension of the tension cable to complete the compensation for the tension of the tension cable, so that the tension of the tension cable hardly changes, reducing the tension caused by the change of the tension cable Harsh effects on the antenna profile.

As shown in Figures 1 and 2, two stop pins 5 can be installed on the large-diameter end of the sliding column 3, and can slide freely in the stop pin sliding groove 9 provided by the sliding sleeve 2, which can prevent the sliding column 3 from Slide the sleeve 2 out. Between the compression spring 4 and the inner wall of the sliding sleeve 2, between the compression spring 4 and the outer wall of the small-diameter section of the sliding column 3 are clearance fits.

As shown in Figures 1 and 2, the second connector 6 includes a screw 10 and two mutually perpendicular lugs with through holes, the screw 10 passes through the through hole of one of the lugs and is fixed on the lug, and the sliding post 3 One end of the small-diameter section is provided with a terminal screw hole, which is fixedly connected with the screw 10 of the second connecting member 6 through threads, so that the change of the tension of the antenna tension cable is transmitted to the compression spring 4 .

The materials of the first connecting part 1 , the sliding sleeve 2 , the sliding column 3 and the second connecting part 6 are titanium alloy or aluminum alloy.

The stiffness of the compression spring 4 in the compensation device should be as small as possible under the premise of satisfying the force compensation, so as to meet the requirement of nearly constant tension, and its stiffness is preferably 0.2N/m-1N/m. Note that the outer diameter of the sliding sleeve 2 is D _t , the inner diameter is d _t , the diameter of the large diameter section of the sliding column 3 is D _z , the diameter of the small diameter section is d _z , the middle diameter of the compression spring 4 is D and the wire diameter is d ; The minimum value of the wall thickness of the sliding sleeve 2 is h _min , and the maximum value of the wall thickness of the sliding sleeve 2 is h _max , so it is appropriate to satisfy the following relationship:

$\left\{\begin{array}{c}{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; z</span>}}<span\; class="notranslate">\; <</span>\mathrm{<span\; class="notranslate">\; D.</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; d</span>}\\ {\mathrm{<span\; class="notranslate">\; D.</span>}}_{\mathrm{<span\; class="notranslate">\; z</span>}}<span\; class="notranslate">\; ></span>\mathrm{<span\; class="notranslate">\; D.</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; d</span>}\\ {\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; t</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; min</span>}}<span\; class="notranslate">\; \&le;</span>{\mathrm{<span\; class="notranslate">\; D.</span>}}_{\mathrm{<span\; class="notranslate">\; t</span>}}<span\; class="notranslate">\; \&le;</span>{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; t</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; max</span>}}\\ {\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; t</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; D.</span>}}_{\mathrm{<span\; class="notranslate">\; z</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 0.04</span>}\mathrm{<span\; class="notranslate">\; mm</span>}<span\; class="notranslate">\; ~</span>\mathrm{<span\; class="notranslate">\; 0.12</span>}\mathrm{<span\; class="notranslate">\; mm</span>}\end{array}\right.<span\; class="notranslate">\; ;</span>$

In the present invention, the minimum value h _min of the wall thickness of the sliding sleeve 2 is 0.8 mm, and the maximum value h _max of the wall thickness of the sliding sleeve 2 is 1.2 mm.

The large diameter section of the sliding column 3 mainly plays a guiding role. According to the different inner diameters of the sliding sleeve 2, its length is preferably 2mm-10mm. The inner diameter of the sliding sleeve 2 and the surface roughness parameter value of the sliding column 3 are not greater than 1.6.

The tension cable near-constant tension compensation device of the present invention connects the tension cable of the antenna cable network system and the rigid structure of the antenna. When the antenna is folded, the tension cable is in a relaxed state, and the compression spring in the tension compensation device is in an initial state. As the antenna unfolds, the tension cable is gradually tensioned, and the tension cable drives the tension cable connector and drives the sliding column and the sliding sleeve to slide. At this time, the compression spring undergoes elastic deformation to generate elastic force. When the antenna is fully unfolded, the compression spring occurs The elastic force produced by elastic deformation is equal to the tension of the tension cable, and the two reach a balanced state. The tension of the tension cable at this time is the pretension of the tension cable required by the design. When the length of the tension cable is changed (increased or shortened) due to temperature changes in space, the tension of the tension cable will change accordingly (decrease or increase), because the elastic force of the compression spring in the tension compensation device and the tension of the tension cable are always If they are equal, the elastic force of the compression spring also changes to the same degree at this time, and the compression amount of the compression spring changes, so that a corresponding sliding occurs between the sliding sleeve and the sliding post. The change of the length of the tension cable is reflected by the change of the compression amount of the compression spring. The change of the tension of the tension cable during the time is very small, almost negligible, and the purpose of tension compensation is achieved.

Taking the umbrella-shaped antenna cable network system as an example, Fig. 3 is a schematic diagram of the installation and connection of the near-constant tension compensation device on the antenna of the present invention, and a compensation device is connected to both ends of the main tension cable and the auxiliary tension cable.

In the antenna cable network design stage, through the calculation and analysis of the cable network system, the lofting length of the tension cable is obtained, and the two ends of the tension cable are respectively connected to the compensation devices at both ends. As shown in Figure 4, the present invention is under the tension cable relaxation state. Schematic diagram of the state of the near-constant tension compensation device. When the antenna is folded, the tension cable is in a relaxed state, and the compression spring 4 of the tension compensation device is in an initial state. As the antenna is unfolded, the tension cable is gradually tensioned, and the tension cable drives the sliding column 3 and the sliding sleeve 2 to slide relative to each other, forcing the compression spring 4 to undergo elastic deformation to generate elastic force. When the antenna is fully deployed, the elastic force generated by the elastic deformation of the compression spring 4 is equal to the tension of the tension cable, and the two reach a balanced state. The tension of the tension cable at this time is the pretension of the tension cable required by the design, as shown in Figure 5 It is a schematic diagram of the state of the near-constant tension compensation device in the tensioned state of the tension cable of the present invention.

Taking a tension cable of a certain material as an example, assuming that its section diameter is 2mm, its modulus is 50GP, its thermal expansion coefficient is -2e-6, the ambient temperature change is ±150°C, the pretension at room temperature (20°C) is 20N, and its length is 1m, the two ends of the cable are respectively hard connected to the antenna structure. Then, when the ambient temperature is 150°C, the tension cable is shortened by 0.26mm, and the tension of the tension cable increases to 40.8N at this time, the tension variation is 20.8N, and the change rate is 104%. When the ambient temperature is -150°C, the length of the tension cable is 0.34mm. According to the initial condition of 20N tension, the length of the cable is 1m, and the natural length of the tension cable is 999.87mm. At this time, 1000mm-0.34mm=999.66mm, which is less than the natural length of the tension cable , and eventually tension cable relaxation occurs, resulting in deterioration of the antenna profile.

After the compensation device of the present invention is installed at both ends of the tension cable, still take the above calculation example as an example, if the compression spring stiffness is 1N/mm, considering the thermal deformation of the tension compensation device itself, assuming that the device length is 30mm, the comprehensive thermal deformation coefficient is 20e-6, when the tension cable is shortened by 0.26mm, the devices at both ends become longer by 0.078mm, then the length change of the tension cable and the compensation device is 0.104, the change of the tension cable tension is 0.104N, and the change rate is only 0.52% ; When the tension cable becomes longer by 0.34mm, the devices at both ends are shortened by 0.102mm, then the length variation of the tension cable and the compensation device is integrated to be 0.136, the variation of the tension cable tension is 0.136N, and the rate of change is only 0.68%.

It can be seen from the above examples that after adding the near-constant tension compensation device, the change in the tension of the tension cable due to temperature changes is very small, which is negligible compared with the original pre-tension, ensuring the stability of the tension of the tension cable in space .

The above description is only the best specific implementation mode of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of changes or modifications within the technical scope disclosed in the present invention. Replacement should be covered within the protection scope of the present invention.

The content that is not described in detail in the specification of the present invention belongs to the well-known technology of those skilled in the art.

Claims (8)

1. A near-constant tension compensation device for tension cables, comprising a first connecting piece (1), a sliding sleeve (2), a sliding column (3), a compression spring (4), two stop pins (5) and a second Connecting parts (6), wherein the first connecting part (1) is used to connect the antenna rigid structure (8), the second connecting part (6) is used to connect the antenna tension cable (7), and the first connecting part (1) and The sliding sleeve (2) is connected so that the sliding sleeve (2) can freely rotate around the first connecting piece (1) to meet the angle change when the antenna tension cable (7) is adjusted, and one end of the compression spring (4) is fixed Installed on the large-diameter section of the sliding column (3), and set on the small-diameter section of the sliding column (3), the sliding column (3) and the compression spring (4) are fixedly connected on the same axis and then assembled to the sliding sleeve (2 ) inside, two retaining pins (5) are fixedly connected with the sliding column (3) and can slide freely in the retaining pin sliding groove (9) provided by the sliding sleeve (2), the compression spring (4) and the sliding sleeve ( 2), between the compression spring (4) and the small-diameter section of the sliding column (3) are clearance fits, and the second connecting piece (6) is fixedly connected with one end of the small-diameter section of the sliding column (3), so that Changes in the tension of the antenna tension cable (7) are transmitted to the compression spring (4). 2. A near-constant tension compensation device for tension cables according to claim 1, characterized in that: the first connecting piece (1) includes two lugs with through holes, and the first connecting piece (1) The two lugs with through holes are connected with the sliding sleeve (2) by means of pins, so that the sliding sleeve (2) can freely rotate around the first connecting piece (1). 3. A near-constant tension compensation device for tension cables according to claim 1, characterized in that: the sliding sleeve (2) can freely rotate around the first connecting piece (1) within the range of -90° to 90° turn. 4. A tension cable near-constant tension compensation device according to claim 1, characterized in that: the second connecting piece (6) includes a screw (10) and two mutually perpendicular lugs with through holes , the screw (10) passes through the through hole of one of the lugs and is fixed on the lug, and one end of the small diameter section of the sliding column (3) has a terminal screw hole, which is fixedly connected with the screw (10) by threads. 5. A near-constant tension compensation device for tension cables according to claim 1, characterized in that: the first connecting piece (1), the sliding sleeve (2), the sliding column (3), and the second connecting piece (6) All materials are titanium alloy or aluminum alloy. 6. A tension cable near-constant tension compensation device according to claim 1, characterized in that: the outer diameter of the sliding sleeve (2) is D _t , the inner diameter is d _t ; the large diameter of the sliding column (3) The diameter of the segment is D _z , the diameter of the small diameter segment is d _z ; the middle diameter of the compression spring (4) is D and the wire diameter is d, then the following relationship is satisfied: $\left\{\begin{array}{c}{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; z</span>}}<span\; class="notranslate">\; <</span>\mathrm{<span\; class="notranslate">\; D.</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; d</span>}\\ {\mathrm{<span\; class="notranslate">\; D.</span>}}_{\mathrm{<span\; class="notranslate">\; z</span>}}<span\; class="notranslate">\; ></span>\mathrm{<span\; class="notranslate">\; D.</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; d</span>}\\ {\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; t</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; min</span>}}<span\; class="notranslate">\; \&le;</span>{\mathrm{<span\; class="notranslate">\; D.</span>}}_{\mathrm{<span\; class="notranslate">\; t</span>}}<span\; class="notranslate">\; \&le;</span>{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; t</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; max</span>}}\\ {\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; t</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; D.</span>}}_{\mathrm{<span\; class="notranslate">\; z</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 0.04</span>}\mathrm{<span\; class="notranslate">\; mm</span>}<span\; class="notranslate">\; ~</span>\mathrm{<span\; class="notranslate">\; 0.12</span>}\mathrm{<span\; class="notranslate">\; mm</span>}\end{array}\right.<span\; class="notranslate">\; ;</span>$ Where: h _min is the minimum value of the wall thickness of the sliding sleeve (2), h _max is the maximum value of the wall thickness of the sliding sleeve (2). 7. A near-constant tension compensation device for tension cables according to claim 6, characterized in that: the minimum value h _min of the wall thickness of the sliding sleeve (2) is 0.8 mm, and the sliding sleeve (2) The maximum value h _max of the wall thickness is 1.2 mm. 8. A tension cable near-constant tension compensation device according to any one of claims 1-7, characterized in that: the stiffness of the compression spring (4) is 0.2N/m-1N/m, and the The length of the large diameter section of the sliding column (3) is 2mm-10mm; the inner diameter of the sliding sleeve (2) and the surface roughness parameter value of the sliding column (3) are not greater than 1.6.

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