CN104626112B - a mechanical arm - Google Patents

Abstract

The invention provides a mechanical arm, and belongs to the technical field of machinery. It has solved the current poor problem of arm leakproofness. This arm includes the body and passes through the end cover that the screw linked firmly mutually with the body, the head that has annular groove and screw on the end cover outer fringe is located the annular groove, be equipped with a plurality of through-holes that distribute along circumference on the lateral wall of annular groove, the through-hole is including the spacing hole that steps down the hole that can let the screwhead pass and can prevent the screwhead to pass, spacing hole is linked together with the hole of stepping down, be equipped with the snap ring that links firmly mutually with the screwhead in the annular groove, the snap ring is the ring form and has the breach, cup jointed the rubber circle that can seal the notch of annular groove on the lateral wall of snap ring is located the annular groove and this snap ring lateral. The mechanical arm has the advantage of good sealing effect.

Description

a mechanical arm

technical field

The invention belongs to the technical field of machinery and relates to a mechanical arm.

Background technique

The robotic arm is currently the most widely used automated mechanical device in the field of robotics. It can be seen in industrial manufacturing, medical treatment, entertainment services, military, semiconductor manufacturing, and space exploration. Although their shapes are different, they all have a common feature, that is, they can accept instructions and precisely locate a certain point in three-dimensional (or two-dimensional) space for operation.

In the prior art, the joints on the mechanical arm or the connections between the joints and the end caps or between the joints and other components are directly connected by fasteners such as screws, so that the screws are directly exposed on the mechanical arm. When the mechanical arm is used under relatively harsh working conditions, impurities such as dust and water can easily enter the mechanical arm through the joint of the screw, affecting the normal operation of the mechanical arm. At the same time, since there are many joints on the mechanical arm, and there are many positions that need to be connected, the number of screws used is also large, so that more impurities such as dust and water enter the mechanical arm through the joints of the screws, greatly Affect the normal work of the robot arm.

Contents of the invention

The object of the present invention is to solve the above-mentioned problems in the prior art, and propose a mechanical arm that hides screws.

The purpose of the present invention can be achieved through the following technical solutions: a mechanical arm, including a body and an end cover fixed to the body through screws, characterized in that the outer edge of the end cover has an annular groove and the The head of the screw is located in the annular groove, and the side wall of the annular groove is provided with a number of through holes distributed along the circumferential direction, and the through holes include holes for the screw head to pass through. A positioning hole and a limiting hole capable of preventing the screw head from passing through, the limiting hole communicates with the relief hole, and a snap ring fixedly connected with the screw head is provided in the annular groove , the snap ring is in the shape of a ring and has a gap, the outer wall of the snap ring is located in the annular groove, and the outer wall of the snap ring is sleeved with a seal that can seal the notch of the annular groove rubber band.

When in use, pre-tighten the screw shank and the body first, then the screw head passes through the relief hole and is located in the annular groove, then turn the end cover so that the screw shank is in the limit hole, and then extend the wrench into the Tighten the screw into the ring groove, then open the snap ring through the notch into the ring groove and fix it with the screw head to hide the screw head, and finally put a rubber ring on the outside of the snap ring to seal the ring groove. Groove notch seal.

Through the above structure, the head of the screw is hidden in the annular groove, and the body and the end cover are screwed together through the screw, so that the screw is completely hidden and the sealing performance of the mechanical arm is improved; at the same time, under the support of the snap ring, The rubber ring is stably positioned so that the annular groove is always sealed, effectively preventing impurities such as dust and water from entering the annular groove and entering into the body through the connection between the screw and each component to affect the work of the robot arm; especially when When the mechanical arm is used in a relatively harsh working environment, the sealing effect of the mechanical arm achieved by completely hiding the screws is more prominent.

In the above-mentioned mechanical arm, the rubber ring is circular and the outer sidewall of the rubber ring is flush with the outer sidewall of the end cap.

The outer wall of the rubber ring is flush with the outer wall of the end cover, which effectively reduces the chance of the rubber ring colliding with other components, thereby stably positioning the rubber ring and keeping the ring groove always sealed, effectively preventing dust, water and other impurities from entering In the annular groove, the sealing effect of the mechanical arm is further improved, and at the same time, the head of the screw is better hidden in the annular groove.

In the aforementioned mechanical arm, the annular groove includes two opposite side walls, and the two side walls of the clasp are in contact with the two side walls of the annular groove respectively.

Under the action of friction, the snap ring is positioned more stably, thereby supporting the rubber ring more stably, so that the annular groove is always sealed, which further improves the sealing effect of the mechanical arm, and at the same time makes the screw head better. The ground is hidden in the annular groove.

In the above-mentioned mechanical arm, the inner side of the snap ring has a number of protruding teeth uniformly distributed along the circumference, and a positioning groove is formed between two adjacent protruding teeth, and the head of the screw is clamped in the positioning position. in the slot.

The head of the screw is clamped in the positioning groove, so that the snap ring is stably positioned, so that the rubber ring is better supported by the snap ring, so that the annular groove is always sealed, which further improves the sealing effect of the mechanical arm, and at the same time makes The screw heads are better concealed in the annular groove.

In the aforementioned mechanical arm, the annular groove includes a bottom wall located between two side walls, and each of the protruding teeth abuts against the bottom wall of the annular groove.

The protruding teeth are offset against the bottom wall of the annular groove, which increases the contact area between the snap ring and the end cap, and makes the snap ring be positioned more stably, thereby improving the sealing effect of the mechanical arm, and at the same time, the screw head is better secured. Hidden in the ring groove.

In the above mechanical arm, the relief hole is circular, the limiting hole is arc-shaped, and there is a smooth transition between the limiting hole and the relief hole.

The limit hole and the relief hole are smoothly fixed, so that the screw can be rotated smoothly during installation.

Compared with the prior art, this mechanical arm has the following advantages:

1. The head of the screw is hidden through the cooperation of the annular groove, the snap ring and the rubber ring, and the body and the end cover are screwed together by the screw, so that the screw is completely hidden and the airtightness of the mechanical arm is improved.

2. Under the support of the snap ring, the rubber ring is stably positioned so that the annular groove is always sealed, effectively preventing impurities such as dust and water from entering the annular groove and entering through the connection between the screw and each component. The body affects the work of the robot arm; especially when the robot arm is used in a relatively harsh working environment, the sealing effect of the robot arm achieved by completely hiding the screws is more prominent.

3. The outer wall of the rubber ring is flush with the outer wall of the end cover, which effectively reduces the chance of the rubber ring colliding with other components, thereby stably positioning the rubber ring and keeping the ring groove always sealed, effectively avoiding dust, water and other impurities Entering into the annular groove, the sealing effect of the mechanical arm is further improved, and at the same time, the head of the screw is better hidden in the annular groove.

Description of drawings

FIG. 1 is a schematic diagram of a three-dimensional structure of a mechanical arm.

Figure 2 is a schematic diagram of the exploded structure of the robotic arm.

Fig. 3 is a schematic diagram of the connection structure between the screw and the through hole.

Fig. 4 is a schematic diagram of the connection structure between the screw and the snap ring.

Fig. 5 is a schematic cross-sectional structure diagram of the mechanical arm.

In the figure, 1, body; 1a, connecting cylinder; 1b, limit post; 1b1, threaded hole; 2, end cap; 2a, annular groove; 2b, through hole; 2b1, limit hole; 2b2, relief hole ; 3, screw; 4, snap ring; 4a, convex tooth; 4b, positioning groove; 5, rubber ring.

detailed description

The following are specific embodiments of the present invention and in conjunction with the accompanying drawings, further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

As shown in FIGS. 1 and 2 , the mechanical arm includes a main body 1 , an end cover 2 , a snap ring 4 , and a rubber ring 5 , wherein the main body 1 and the end cover 2 are fixedly connected by screws 3 .

Specifically, as shown in Figure 2, there is a protruding and cylindrical connecting cylinder 1a on the outer wall of the main body 1, and several limiting columns 1b are connected in the connecting cylinder 1a, and several limiting columns 1b are distributed along the circumferential direction. And the lower end of the limit column 1b is connected with the body 1 as a whole. A threaded hole 1b1 is axially provided at the upper end of each limiting column 1b, and ribs are connected to the outer wall of each limiting column 1b to strengthen the strength of the limiting column 1b.

The connecting cylinder 1 a is located between the end cap 2 and the body 1 and the connecting cylinder 1 a is opposite to the end cap 2 . The outer edge of the end cover 2 has an annular groove 2a arranged coaxially therewith, and a plurality of through holes 2b distributed along the circumferential direction are opened on the side wall of the annular groove 2a.

As shown in Figure 3, each through hole 2b includes a relief hole 2b2 that allows the head of the screw 3 to pass through and a limiting hole 2b1 that can prevent the head of the screw 3 from passing through. The above-mentioned relief hole 2b2 is connected. In this embodiment, the relief hole 2b2 is circular and the diameter of the relief hole 2b2 is larger than the diameter of the head of the screw 3, the limiting hole 2b1 is arc-shaped and the diameter of the limiting hole 2b1 is smaller than the diameter of the head of the screw 3 But it is larger than the diameter of the screw 3 shank. The smooth transition between the limiting hole 2b1 and the relief hole 2b2 enables the screw 3 to rotate smoothly during installation. The number of limiting columns 1b is the same as the number of through holes 2b and the positions are opposite to the limiting holes 2b1.

The snap ring 4 is located in the annular groove 2 a and the snap ring 4 is fixedly connected with the head of the screw 3 . In this embodiment, as shown in FIG. 2 , FIG. 4 and FIG. 5 , the snap ring 4 is circular and has a notch, and the head of the screw 3 is located inside the snap ring 4 during installation.

To further illustrate, as shown in FIG. 5 , the annular groove 2 a includes two opposite side walls and a bottom wall located between the two side walls. The two sidewalls of the snap ring 4 and the two side walls of the annular groove 2a abut against each other, so that the snap ring 4 is stably positioned in the annular groove 2a, and the head of the screw 3 is better hidden inside the snap ring 4 .

As shown in FIG. 2 and FIG. 4 , the inner side of the snap ring 4 has a plurality of protruding teeth 4 a uniformly distributed along the circumferential direction, and a positioning groove 4 b is formed between two adjacent protruding teeth 4 a. Each protruding tooth 4a abuts against the bottom wall of the annular groove 2a, increasing the contact area between the snap ring 4 and the end cover 2, so that the snap ring 4 is positioned more stably.

The positioning groove 4b includes opposite side walls and a bottom wall positioned between the two side walls, wherein the both side walls of the positioning groove 4b are an inclined surface, the bottom wall of the positioning groove 4b is an arc surface, and the positioning groove There is a smooth transition between the two side walls of 4b and the bottom wall of the positioning groove 4b. The head of the screw 3 is clamped in the positioning groove 4b, thereby stably positioning the snap ring 4, so that the rubber ring 5 is better supported by the snap ring 4, and the annular groove 2a is always kept sealed, thereby further improving the mechanical arm. The sealing effect is better, and at the same time, the head of the screw 3 is better hidden in the annular groove 2a.

To further illustrate, the outer wall of the snap ring 4 is located in the said annular groove 2a. That is, the snap ring 4 is completely located in the annular groove 2a. A rubber ring 5 capable of sealing the notch of the annular groove 2a is sheathed on the outer wall of the snap ring 4 . In this embodiment, the rubber ring 5 is in the shape of a ring, and the two sides of the rubber ring 5 are respectively attached to the two side walls of the annular groove 2a, and the outer side wall of the rubber ring 5 is flush with the outer side wall of the end cover 2 , so that the rubber ring 5 is stably positioned, so that the screw 3 is better hidden inside the snap ring 5, and the sealing effect of the mechanical arm is further improved.

As shown in Figure 5, when installing, first screw the stem of the screw 3 into the limit column 1b, then insert the lower end of the end cover 2 into the connecting cylinder 1a and abut against the limit column 1b, and at this time, the screw 3 The head passes through the relief hole 2b2 on the through hole 2b and is located in the annular groove 2a. Then the end cover 2 is rotated so that the screw 3 is located in the limiting hole 2b1 on the through hole 2b. Then the wrench extends into the annular groove 2a and tightens the screw 3. Since the diameter of the head of the screw 3 is larger than the diameter of the limiting hole 2b1, the screw 3 is stably positioned. Then, the snap ring 4 is opened through the gap and inserted into the annular groove 2a, and the head of the screw 3 is snapped into the positioning groove 4b to fix the snap ring 4, and finally the rubber ring 5 is sleeved on the outside of the snap ring, so that the ring The groove 2a is sealed, and the head of the screw 3 is hidden in the annular groove 2a.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which the present invention belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, but they will not deviate from the spirit of the present invention or go beyond the definition of the appended claims range.

Claims (6)

1. a mechanical arm, the end cap (2) comprising body (1) and be connected mutually by screw (3) with body (1), it is characterized in that, described end cap (2) outer rim has annular groove (2a) and the head of described screw (3) is positioned at described annular groove (2a), the sidewall of described annular groove (2a) is provided with some through holes (2b) circumferentially distributed, described through hole (2b) comprises the resigning hole (2b2) that screw (3) head can be allowed to pass and the spacing hole (2b1) that screw (3) head can be stoped to pass, described spacing hole (2b1) is connected with described resigning hole (2b2), the snap ring (4) be connected mutually with screw (3) head is provided with in described annular groove (2a), described snap ring (4) is in circular and have breach, the lateral wall of described snap ring (4) is positioned at described annular groove (2a) and this snap ring (4) lateral wall is socketed with the rubber ring (5) that the notch of annular groove (2a) can be sealed.

2. mechanical arm according to claim 1, is characterized in that, described rubber ring (5) in annular and the lateral wall of this rubber ring (5) and described end cap (2) lateral wall flush.

3. mechanical arm according to claim 1 and 2, it is characterized in that, described annular groove (2a) comprises relative two side, and the two sides of described snap ring (4) recline mutually with the two side of described annular groove (2a) respectively.

4. mechanical arm according to claim 3, it is characterized in that, described snap ring (4) inner side has some circumferentially uniform double wedges (4a), form a locating slot (4b) between double wedge (4a) described in adjacent two, described screw (3) head is connected in described locating slot (4b).

5. mechanical arm according to claim 4, it is characterized in that, described annular groove (2a) comprises a diapire between two side, and each described double wedge (4a) all leans with described annular groove (2a) diapire.

6. mechanical arm according to claim 1, it is characterized in that, described resigning hole (2b2) is rounded, and described spacing hole (2b1) is in circular arc and by seamlessly transitting between described spacing hole (2b1) and described resigning hole (2b2).