High-precision inner pull rod rotary clamp

Abstract

The utility model relates to a high accuracy inner pull rod rotary clamp, and relates to the technical field of mechanical assembly, it includes the chassis, and the clamping unit that can clamp and drive the rotation of the screwdriver is driven connection through three -axis drive mechanism on the chassis, three -axis drive mechanism takes XYZ right angle coordinate system as benchmark, including X direction compensation mechanism, Y direction compensation mechanism and Z direction compensation mechanism, through the compensation effect of three -axis drive mechanism, can fine adjustment the position deviation between screwdriver and target fastener, improve the efficiency of assembly, and the clamping unit includes the main frame and the clamp that rotates in its one side, and the clamp one side is equipped with the pressure tight power unit that can clamp the screwdriver, and the pressure tight power unit connects the pull rod structure and is connected with telescopic drive mechanism transmission, and telescopic drive mechanism will drive force convert into the pressure tight force to screwdriver and the screwing target, continuously press the screwdriver in the assembly process, and further reduce the engagement deviation of screwdriver head and target slot position.

Description

Technical Field

[0001] This utility model relates to the technical field of mechanical assembly, and in particular to a high-precision internal tie rod rotating clamp. Background Technology

[0002] In the process of precision mechanical assembly, the tightening of fasteners requires extremely high positioning accuracy and coaxiality, and affects the service life of the fasteners.

[0003] Currently, conventional fixtures first clamp the screwdriver and then align it with the target for tightening. However, the screwdriver's positioning compensation capability is insufficient after clamping, making it impossible to make real-time fine adjustments based on the tightening position. Manual adjustment is difficult and inefficient. In addition, existing assembly structures usually only restrict the screwdriver's screwing direction, resulting in a meshing deviation between the screwdriver head and the target slot, making it difficult to achieve high-precision tightening. Utility Model Content

[0004] In order to improve the problems mentioned above, this utility model provides a high-precision internal tie rod rotating clamp.

[0005] The high-precision internal tie rod rotating clamp provided by this utility model adopts the following technical solution: A high-precision internal tie rod rotary clamp is characterized by: a base frame, on which a clamping unit capable of clamping and driving a screwdriver to rotate is driven by a three-axis drive mechanism; the clamping unit includes a main frame and a clamp rotatably disposed on one side and driven by a rotary drive mechanism, the clamp being configured to accommodate the screwdriver; a clamping power unit capable of clamping the screwdriver is provided on the side of the clamp away from the rotary drive mechanism, the clamping power unit being connected to tie rod structures on both sides of the clamp and driven by a telescopic drive mechanism disposed on the three-axis drive mechanism.

[0006] Preferably, the clamping power unit includes a limiting block clamped outside the screwdriver, with a sliding groove on its outer side inclined to the axial direction of the clampdriver, and a connecting piece on the side of the pull rod structure and engaged in the sliding groove.

[0007] More preferably, the telescopic drive mechanism includes a cylinder, which abuts against the push block through a floating joint to compensate for installation errors. The push block is connected to a follower through a rod, and the follower rolls along its axis and abuts against one side of the rotating sensing ring. The other side of the rotating sensing ring is perpendicularly connected to the pull rod structure.

[0008] More preferably, the rotary drive mechanism includes a drive shaft, the rear section of which is fixed in the tightening gun mounting base and cooperates with the tightening gun, and the front section of which passes through the bearing connecting clamp inside the bearing housing. The bearing reduces the rotational friction of the drive shaft, ensuring smooth rotation and accurately transmitting the torque and rotational motion of the tightening gun.

[0009] Preferably, the three-axis drive mechanism is based on the XYZ rectangular coordinate system and includes an X-direction compensation mechanism that can slide along the X direction, a Y-direction compensation mechanism that can slide along the Y direction, and a Z-direction compensation mechanism that can slide along the Z direction. Each of the X-direction compensation mechanism, the Y-direction compensation mechanism, and the Z-direction compensation mechanism is provided with an elastic limiting member to restrict sliding.

[0010] The X-direction compensation mechanism and the Y-direction compensation mechanism respectively realize automatic correction of deviation in the X and Y directions, and the Z-direction compensation mechanism performs vertical elastic compensation to realize automatic correction of deviation in the Z direction, so as to avoid deviation from affecting the quality of operation.

[0011] More preferably, the X-direction compensation mechanism, Y-direction compensation mechanism and Z-direction compensation mechanism are arranged sequentially from bottom to top.

[0012] Preferably, the base frame is also provided with a motion mechanism, which is driven by an electric cylinder to feed the clamping unit along the X direction.

[0013] In summary, this utility model has the following beneficial technical effects: 1. This utility model mounts the clamping unit on a three-axis drive mechanism. Through the compensation effect of the three-axis drive mechanism, the positional deviation between the screwdriver and the target fastener can be finely adjusted to achieve coaxial alignment between the screwdriver and the target fastener, thereby adapting to the tightening requirements of different depths and positions of the target fastener and improving assembly efficiency.

[0014] 2. In the assembly process, the screwdriver contacts the tightening target, and the telescopic drive mechanism outputs and, through the cooperation of the pull rod structure and the clamping power unit, converts the driving force into a clamping force on the screwdriver and the tightening target. During the assembly process, the screwdriver is continuously clamped, and at the same time, the screwdriver is pushed to contact the tightening target, thereby reducing the engagement deviation between the screwdriver head and the target groove and significantly improving the accuracy of the tightening operation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of a high-precision internal tie rod rotating clamp according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the motion mechanism and multi-directional compensation mechanism according to an embodiment of the present utility model; Figure 3 This is a schematic diagram of the clamping unit according to an embodiment of the present invention; Figure 4 yes Figure 3 Schematic diagram of the structure at point A in the middle.

[0016] Explanation of reference numerals in the attached drawings: 1. Clamping unit; 11. Fixture; 12. Clamping power unit; 121. Limiting block; 122. Slide groove; 123. Connecting part; 13. Pull rod structure; 14. Telescopic drive mechanism; 141. Cylinder; 142. Push block; 143. Rod; 144. Follower; 145. Rotary induction ring; 15. Main frame; 16. Drive mechanism; 161. Transmission shaft; 162. Tightening gun fixing seat; 163. Bearing seat; 2. Three-axis drive mechanism; 21. X 211. Directional compensation mechanism; 212. X-compensation base plate; 213. Second linear guide; 214. Second slider; 22. Y-direction compensation mechanism; 221. Y-compensation base plate; 222. Third linear guide; 223. Third slider; 23. Z-direction compensation mechanism; 231. Z-compensation base plate; 232. Third spring column; 233. Lifting plate; 234. Guide rod; 235. Third limiting plate; 24. Elastic limiting component; 3. Base frame; 31. First linear guide; 32. First slider; 4. Screwdriver. Detailed Implementation

[0017] The following combination Figures 1-4 The present invention will be described in further detail below.

[0018] This utility model discloses a high-precision internal tie rod rotating clamp.

[0019] Reference Figure 1 , Figure 3 A high-precision internal tie rod rotary clamp includes a base frame 3. A clamping unit 1, which can clamp and drive a screwdriver 4 to rotate, is connected to the base frame 3 via a three-axis drive mechanism 2. The clamping unit 1 includes a main frame 15 and a clamp 11 rotatably disposed on one side and connected to a rotary drive mechanism 16. The clamp 11 is configured to accommodate the screwdriver 4.

[0020] Furthermore, combined Figure 2 The rotary drive mechanism 16 includes a drive shaft 161. The rear section of the drive shaft 161 is fixed in the tightening gun mounting base 162 and cooperates with the tightening gun. The front section of the drive shaft 161 passes through the bearing inside the bearing housing 163 and is connected to the clamp 11 through a pin, thereby realizing the rotation of the entire clamping unit 1.

[0021] Furthermore, combined Figure 2 The clamp 11 is provided with a clamping power unit 12 on the side away from the rotary drive mechanism 16, which can clamp the screwdriver 4. The clamping power unit 12 is connected to the pull rod structure 13 on both sides of the clamp 11 and is connected to the telescopic drive mechanism 14 on the three-axis drive mechanism 2.

[0022] Furthermore, combining Figure 4The clamping power unit 12 includes a limiting block 121 clamped outside the screwdriver 4. A groove 122 inclined to the axial direction of the clamp 11 is provided on its outer side. A connecting piece 123 is provided on the side of the pull rod structure 13 and is engaged in the groove 122. The driving force of the telescopic drive mechanism 14 is transmitted to the limiting block 121 through the pull rod structure 13. The limiting block 121 moves under force and the clamping power unit 12 converts the driving force of the telescopic drive mechanism 14 into a radial clamping force on the screwdriver 4, ensuring that the screwdriver 4 is stably connected to the tightening target.

[0023] Furthermore, the telescopic drive mechanism 14 includes a cylinder 141, which abuts against a push block 142 via a floating joint. The push block 142 is connected to a follower 144 via a rod 143. The follower 144 rolls along its axis and abuts against one side of the rotating sensing ring 145. When the clamping unit 1 rotates, the cylinder 141 pushes the rotating sensing ring 145. The other side of the rotating sensing ring 145 is perpendicularly connected to the pull rod structure 13.

[0024] The pull rod structure 13 is a telescopic mechanism, including an inner rod and an outer cylinder. The inner rod extends and retracts inside the outer cylinder. A spring is installed on the outer sleeve of the inner rod. The pushing force of the cylinder 141 is converted into the compression force of the spring, which in turn pushes the pull rod structure 13 to extend, adapting to the clamping of the screwdriver 4 and the tightening target. This clamping is flexible and will not be affected by the concentricity of the screwdriver 4 and the tightening target due to workpiece assembly tolerance, workpiece wear, etc.

[0025] Reference Figure 1 , Figure 2 The three-axis drive mechanism 2 is mounted on the base frame 3. The three-axis drive mechanism 2 is based on the XYZ rectangular coordinate system. It includes an X-direction compensation mechanism 21 that can slide along the X direction, a Y-direction compensation mechanism 22 that can slide along the Y direction, and a Z-direction compensation mechanism 23 that can slide along the Z direction. Each of the X-direction compensation mechanism 21, the Y-direction compensation mechanism 22, and the Z-direction compensation mechanism 23 is provided with an elastic limiting member 24 to restrict sliding.

[0026] The X, Y, and Z directions are defined based on the Cartesian coordinate system. The three directions are orthogonal to each other and correspond to the three linear motion dimensions in three-dimensional space.

[0027] Furthermore, the X-direction compensation mechanism 21, the Y-direction compensation mechanism 22, and the Z-direction compensation mechanism 23 are arranged sequentially from bottom to top.

[0028] Furthermore, the X-direction compensation mechanism 21 is mounted on the base frame 3 via the X-compensation base plate 211. The X-direction compensation mechanism 21 includes a second linear rail 212 laid along the X direction on the X-compensation base plate 211. A second slider 213 is slidably disposed on the second linear rail 212. The top of the second slider 213 is connected to the Y-compensation base plate 221.

[0029] The X-direction compensation mechanism 21 is provided with a first elastic limiting member, and a first mounting plate is provided at the front end of the base plate 211 along the X direction. The first limiting plate is connected to the Y-compensation base plate 221 by a first spring column, thereby restricting the movement of the X-direction compensation mechanism 21 on the second linear guide 212.

[0030] Furthermore, the Y-direction compensation mechanism 22 is installed on the Y-compensation base plate 221, which includes a third linear rail 222 laid along the Y direction on the Y-compensation base plate 221, a third slider 223 slidably disposed on the third linear rail 222, and the top of the third slider 223 is connected to the Z-compensation base plate 231.

[0031] The Y-direction compensation mechanism 22 is provided with a second elastic limiting member, and a second mounting plate is provided on both sides of the Y-compensation base plate 221 along the Y direction. The second limiting plate is connected to the Z-compensation base plate 231 by a second spring column, thereby restricting the movement of the Y-direction compensation mechanism 22 on the third linear guide 222.

[0032] Furthermore, the Z-direction compensation mechanism 23 is installed on the Z-compensation base plate 231, which includes a third spring column 232 vertically arranged on the Z-compensation base plate 231 and connected to the lifting plate 233. The internal guide rod 234 of the third spring column 232 extends vertically out of the lifting plate 233 and the external part of the protruding part is fitted with a linear bearing. The top end of the guide rod 234 is connected to a third limiting plate 235 movably installed on the lifting plate 233.

[0033] A third elastic limiting member is provided vertically between the Z-compensation base plate 231 and the lifting plate 233 to limit the lifting height of the lifting plate 233.

[0034] The above scheme automatically corrects the deviation in the X direction through the X-direction compensation mechanism 21, automatically corrects the deviation in the Y direction through the Y-direction compensation mechanism 22, and automatically corrects the deviation in the Z direction through the Z-direction compensation mechanism 23.

[0035] Reference Figure 1 The base frame 3 is also equipped with a motion mechanism, which is driven by an electric cylinder to feed the clamping unit 1 along the X direction.

[0036] Based on the XYZ rectangular coordinate system, the motion mechanism includes a first linear rail 31 laid on the base plate along the X direction, a first slider 32 slidably disposed on the first linear rail 31 and driven by an electric cylinder, and the top of the first slider 32 is connected to the X compensation base plate 211.

[0037] The implementation principle of a high-precision internal tie rod rotating clamp according to this utility model embodiment is as follows: the screwdriver 4 is inserted into the clamp 11 along the axial direction, and the front end of the screwdriver 4 is extended by a preset length according to the tightening depth; the electric cylinder drive of the base frame 3 moves the overall structure to the vicinity of the tightening target, the external tightening gun is started, and the torque is transmitted to the clamp 11 through the transmission shaft 161. The clamp 11 rotates, and then pushes the clamping screwdriver 4 through the telescopic drive mechanism 14 to make the screwdriver 4 contact and press against the tightening target. The three-axis drive mechanism 2 responds to the deviation and performs position compensation in the XYZ directions. After tightening is completed, it is reset.

Claims

1. A high-precision internal tie rod rotating clamp, characterized in that: Includes a base frame (3), on which a clamping unit (1) capable of clamping and driving the screwdriver (4) to rotate is connected via a three-axis drive mechanism (2); The clamping unit (1) includes a main frame (15) and a clamp (11) rotatably disposed on one side thereof and connected to a rotary drive mechanism (16). The clamp (11) is configured to accommodate the screwdriver (4) when it is inserted. The clamp (11) is provided with a clamping power unit (12) on the side away from the rotary drive mechanism (16) that can clamp the screwdriver (4). The clamping power unit (12) is connected to the pull rod structure (13) on both sides of the clamp (11) and is connected to the telescopic drive mechanism (14) on the three-axis drive mechanism (2).

2. The high-precision internal tie rod rotating clamp according to claim 1, characterized in that: The clamping power unit (12) includes a limiting block (121) clamped outside the screwdriver (4), and a groove (122) inclined to the axial direction of the clamp (11) is provided on its outer side. The pull rod structure (13) is provided with a connector (123) on its side and is engaged in the groove (122).

3. The high-precision internal tie rod rotating clamp according to claim 1, characterized in that: The telescopic drive mechanism (14) includes a cylinder (141), which abuts against a push block (142) via a floating joint. The push block (142) is connected to a follower (144) via a rod (143). The follower (144) rolls along its axis and abuts against one side of a rotating sensing ring (145). The other side of the rotating sensing ring (145) is perpendicularly connected to a pull rod structure (13).

4. The high-precision internal tie rod rotating clamp according to claim 1, characterized in that: The rotary drive mechanism (16) includes a drive shaft (161), the rear section of which is fixed in the tightening gun mounting base (162) and cooperates with the tightening gun, and the front section of which passes through the bearing connecting clamp (11) inside the bearing housing (163).

5. A high-precision internal tie rod rotating clamp according to claim 1, characterized in that: The three-axis drive mechanism (2) is based on the XYZ rectangular coordinate system and includes an X-direction compensation mechanism (21) that can slide along the X direction, a Y-direction compensation mechanism (22) that can slide along the Y direction, and a Z-direction compensation mechanism (23) that can slide along the Z direction. Each of the X-direction compensation mechanism (21), the Y-direction compensation mechanism (22), and the Z-direction compensation mechanism (23) is provided with an elastic limiter (24) to restrict sliding.

6. A high-precision internal tie rod rotating clamp according to claim 5, characterized in that: The X-direction compensation mechanism (21), Y-direction compensation mechanism (22) and Z-direction compensation mechanism (23) are arranged from bottom to top.

7. A high-precision internal tie rod rotating clamp according to claim 1, characterized in that: The base frame (3) is also equipped with a motion mechanism, which is driven by an electric cylinder and drives the clamping unit (1) to feed along the X direction.

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