A clamping mechanism and a fixing device for machining a needle bar frame.

Abstract

This invention discloses a clamping mechanism, comprising: a clamping cylinder, a transmission rod, a clamping rod, a first transmission structure, a second transmission structure, and a self-locking structure; the first transmission structure drives the piston rod of the clamping cylinder and the transmission rod, causing the piston rod and the transmission rod to move axially synchronously and in the same direction, and the travel stroke of the transmission rod is less than that of the piston rod; the second transmission structure drives the transmission rod and the clamping rod, causing the transmission rod and the clamping rod to move axially synchronously and in opposite directions; the self-locking structure is disposed on the transmission rod and can lock the clamping rod when it moves to the clamping point. The beneficial effect of this invention is that it avoids mechanical damage while achieving clamping.

Description

Technical Field

[0001] This invention relates to a clamping mechanism and a fixing device for machining needle bar frames, belonging to the technical field of tooling for machining needle bar frames. Background Technology

[0002] The needle bar holder is an indispensable component of a computerized embroidery machine. It has multiple processing features such as needle bar mounting holes, thread clamping top rod holes, thread take-up rod mounting holes, and bead frame guide rail mounting surfaces. It is the basis for the installation of other parts, so there are high requirements for the dimensional accuracy, geometric accuracy, and mutual positional accuracy of the needle bar holder.

[0003] Currently, needle bar frames are mainly processed by rough machining of the reference surface in a machining center, followed by precision machining and drilling. Before machining, the needle bar frame usually needs to be clamped and fixed. The commonly used clamping tools, together with other workpieces, clamp the needle bar frame. When the clamping tools are clamped on the needle bar frame, they can easily cause mechanical damage to the surface of the needle bar frame, such as dents or cracks, which will affect the quality of the product. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a clamping mechanism and a fixing device for processing the needle bar frame, which can clamp the needle bar while avoiding mechanical damage.

[0005] The present invention is achieved through the following technical solution.

[0006] A clamping mechanism includes: a clamping cylinder, a transmission rod, a clamping rod, a first transmission structure, a second transmission structure, and a self-locking structure; the first transmission structure drives the piston rod of the clamping cylinder and the transmission rod, causing the piston rod and the transmission rod to move axially synchronously in the same direction, and the travel stroke of the transmission rod is less than that of the piston rod; the second transmission structure drives the transmission rod and the clamping rod, causing the transmission rod and the clamping rod to move axially synchronously in opposite directions; the self-locking structure is disposed on the transmission rod and can lock the clamping rod when it moves to the clamping point.

[0007] As a further improvement of the present invention, the self-locking structure includes a self-locking connector and a self-locking rod; the self-locking connector is connected to the transmission rod, and the self-locking rod is connected to the self-locking connector and spaced apart from the transmission rod; as the clamping rod moves axially and gradually approaches the clamping point, the self-locking rod gradually approaches the clamping rod; when the clamping rod moves to the clamping point, one end of the self-locking rod abuts against the rod body of the clamping rod.

[0008] As a further improvement of the present invention, the end face of the self-locking rod used to abut the clamping rod is an arc-shaped surface with a central bulge.

[0009] As a further improvement of the present invention, it also includes a support base; the transmission rod and the clamping rod both pass through the support base, the self-locking rod passes through the support base, and one end of the self-locking rod can abut against the body of the clamping rod.

[0010] As a further improvement of the present invention, the bracket is provided with a guide sleeve that is slidably sleeved on the self-locking rod.

[0011] As a further improvement of the present invention, the second transmission structure includes a first connecting member, a second connecting member, and a second connecting rod; the first connecting member and the second connecting member are respectively connected to the transmission rod and the clamping rod, and the two ends of the second connecting rod are respectively rotatably connected to the first connecting member and the second connecting member.

[0012] As a further improvement of the present invention, the piston rod, transmission rod, and self-locking rod are all parallel to the horizontal plane, and the clamping rod and the second connecting rod are inclined to the horizontal plane; or the piston rod, transmission rod, and self-locking rod are all parallel to the vertical plane, and the clamping rod and the second connecting rod are inclined to the vertical plane.

[0013] As a further improvement of the present invention, the end face of the clamping rod used for clamping is an arc-shaped surface with a central bulge.

[0014] As a further improvement of the present invention, an elastic reset member is provided between the clamping rod and the support seat, and the elastic force generated therefrom is used to drive the clamping rod to move axially in a direction away from the clamping point.

[0015] As a further improvement of the present invention, the first transmission structure includes a first connecting rod and a support; one end of the first connecting rod is rotatably connected to the support, the first connecting rod has a first connection point and a second connection point, and the distance between the first connection point and the support is greater than the distance between the second connection point and the support; one end of the piston rod is rotatably connected to the first connection point, and one end of the transmission rod is rotatably connected to the second connection point.

[0016] As a further improvement of the present invention, the piston rod and the transmission rod are provided with connecting rod connectors at the ends of the first connection point and the second connection point, respectively; the first connecting rod is provided with waist holes at the first connection point and the second connection point, and the connecting rod connector has a pin that passes through the waist hole and can slide along the waist hole.

[0017] A fixing device for machining a needle bar frame includes a machining table; the machining table is provided with at least two side frame support platforms for supporting two side frames of the needle bar frame; the machining table is provided with a front frame clamping platform for abutting against the front frame of the needle bar frame; the machining table is provided with the clamping mechanism for clamping the rear frame of the needle bar frame.

[0018] As a further improvement of the present invention, the processing table is provided with a clamping mechanism for at least two side frames of the needle bar holder.

[0019] As a further improvement of the present invention, the clamping mechanism includes a clamping cylinder, two grippers, and a gripper connector; the gripper connector is disposed at the end of the piston rod of the clamping cylinder, and the two grippers are rotatably connected to the gripper connector; each of the two grippers is provided with a waist hole, and the side frame support platform is provided with two positioning pins that pass through the two waist holes and can slide along the waist holes; the axial movement of the piston rod of the clamping cylinder can drive the opening and closing of the two grippers to release or clamp the side frame of the needle bar holder.

[0020] As a further improvement of the present invention, at least one positioning pin is provided on the front frame clamping platform, and the positioning pin is engaged with the needle bar hole on the front frame of the needle bar holder.

[0021] As a further improvement of the present invention, the processing table is provided with a middle clamping platform, which is used to abut against the middle of the needle bar frame.

[0022] As a further improvement of the present invention, at least one positioning pin is provided on the intermediate clamping platform, and the positioning pin is engaged with the needle bar hole on the intermediate section of the needle bar holder.

[0023] The beneficial effects of this invention are:

[0024] Under the action of the first transmission structure, the moving speed of the transmission rod is lower than that of the piston rod, so that the clamping rod clamps at a moderate speed, which can reduce the mechanical damage caused. Under the action of the second transmission structure, the transmission direction is changed. During the synchronous movement of the transmission rod and the clamping rod, the self-locking structure can approach the clamping rod and lock the clamping rod at the clamping point, thereby preventing the locking rod from exceeding the clamping point and realizing the protection of the needle bar frame. Attached Figure Description

[0025] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings to aid in understanding the objectives and advantages of the present invention, wherein:

[0026] Figure 1 A three-dimensional schematic diagram of the tightening mechanism for implementing Case 1;

[0027] Figure 2 A front view diagram of the tightening mechanism for implementing Case 1;

[0028] Figure 3 A side view diagram of the tightening mechanism for implementing Case 1;

[0029] Figure 4 A schematic diagram of the support structure for implementing Case 1;

[0030] Figure 5 A schematic diagram of the second transmission structure and self-locking structure for implementing Case 1;

[0031] Figure 6 A schematic diagram of the first link in Case 1;

[0032] Figure 7 A schematic diagram of the fixing device for implementing Case 2;

[0033] Figure 8 A schematic diagram of the fixing device and needle bar holder for implementing Case 2;

[0034] Figure 9 A schematic diagram of the clamping mechanism for implementing Case 2. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0036] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to the construction shown in the accompanying drawings. The terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively. These are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive.

[0037] Implementation Case 1:

[0038] A clamping mechanism is mainly used in the drilling process of needle bar holders. Its function is to clamp onto a preset position on the needle bar holder and cooperate with other components to clamp and fix the needle bar holder. Of course, the clamping mechanism in this embodiment can also be applied to the processing of other products to clamp and fix the products by clamping.

[0039] In this embodiment, the tightening mechanism includes a tightening cylinder 11, a transmission rod 12, a tightening rod 13, a first transmission structure, a second transmission structure, and a self-locking structure. The transmission rod 12 is an intermediate transmission component, and the tightening rod 13 is the component that ultimately performs the tightening task. The first transmission structure drives the piston rod 111 of the tightening cylinder 11 and the transmission rod 12, causing the piston rod 111 and the transmission rod 12 to move axially synchronously in the same direction, and the travel of the transmission rod 12 is less than that of the piston rod 111. The second transmission structure drives the transmission rod 12 and the tightening rod 13, causing the transmission rod 12 and the tightening rod 13 to move axially synchronously in opposite directions. The self-locking structure is provided on the transmission rod 12 and can lock the tightening rod 13 when it moves to the tightening point. In this embodiment, the tightening rod 13 has an end face 13a for tightening, and the tightening point refers to the end face 13a to which the tightening rod 13 moves to tighten with a preset force.

[0040] In this embodiment, the clamping mechanism, under the action of the first transmission structure, makes the travel of the transmission rod 12 less than that of the piston rod 111, so that the travel speed of the transmission rod 12 is lower than that of the piston rod 111, thereby slowing down the travel speed of the clamping rod 13. This allows the clamping rod 13 to gradually approach the needle bar frame at a more moderate speed. The process from contacting the needle bar frame to moving to the clamping point of the clamping rod 13 is slow and smooth, which can reduce the mechanical damage to the clamping part of the needle bar frame and avoid dents and deformations.

[0041] In this embodiment, the tightening mechanism uses a cylinder as the drive source, giving the tightening cylinder 11 advantages such as strong versatility, easy installation, reliable quality, high working efficiency, and simple maintenance. However, it suffers from poor precision, mainly manifested in the inaccurate movement stroke of the cylinder. Specifically, in the tightening mechanism of this embodiment, the final moving position of the tightening rod 13 may exceed the tightening point, resulting in excessive tightening and mechanical damage to the tightening part. In this embodiment, under the action of the second transmission structure, the transmission direction changes, causing the axial movement directions of the transmission rod 12 and the tightening rod 13 to be different. Thus, during the synchronous movement of the transmission rod 12 and the tightening rod 13, the self-locking structure can approach the tightening rod 13. Finally, when the tightening rod 13 moves to the tightening point, the self-locking structure can lock the tightening rod 13, preventing the locking rod from exceeding the tightening point and achieving the protection of the needle bar frame.

[0042] In this embodiment, the problem of poor cylinder precision can also cause the tension rod 13 to fail to reach the tensioning point, resulting in a loosening of the tensioning action of the tension rod 13. Therefore, in practical applications, the tensioning cylinder 11 can be set so that the axial movement of the tension rod 13 driven by the tensioning cylinder 11 slightly exceeds the tensioning point. Through the self-locking structure, the tension rod 13 can be accurately moved to the tensioning point, thereby avoiding over-tightening or loosening of the tension.

[0043] In this embodiment, the self-locking structure includes a self-locking connector 141 and a self-locking rod 142. The self-locking connector 141 is connected to the transmission rod 12, and the self-locking rod 142 is connected to the self-locking connector 141 and spaced apart from the transmission rod 12. More specifically, the self-locking connector 141 has two insertion holes, which are respectively inserted into the transmission rod 12 and the self-locking rod 142. As the tightening rod 13 moves axially and gradually approaches the tightening point, the self-locking rod 142 gradually approaches the tightening rod 13. When the tightening rod 13 moves to the tightening point, one end of the self-locking rod 142 abuts against the body of the tightening rod 13. In this embodiment, the self-locking rod 142 prevents the tightening rod 13 from continuing to move axially through the friction generated by its contact with the tightening rod 13, thereby achieving the function of locking the self-locking rod 142.

[0044] In this embodiment, the self-locking rod 142 is used to abut against the end face 142a of the clamping rod 13, which is an arc-shaped surface with a raised center. This causes the contact area between the end face 142a and the clamping rod 13 to gradually increase during the self-locking process, that is, the frictional force generated by the two gradually increases until the frictional force can prevent the clamping rod 13 from continuing to move axially. During this process, due to the gradual increase in frictional force, the axial movement speed of the clamping rod 13 gradually decreases and eventually stops, that is, a braking effect is generated, thereby making the clamping process of the clamping rod 13 smoother and further reducing the risk of mechanical damage.

[0045] The clamping mechanism in this embodiment also includes a support base 15. The transmission rod 12 and the clamping rod 13 both pass through the support base 15. The self-locking rod 142 passes through the support base 15, and one end of it can abut against the body of the clamping rod 13. Specifically, the support base 15 has two through holes 151 and 152 and one half-hole 153. The two through holes 151 and 152 pass through the support base 15 and respectively insert the transmission rod 12 and the clamping rod 13. The half-hole 153 communicates with the through hole 152 in which the clamping rod 13 is inserted, and the self-locking rod 142 is inserted into this half-hole 153. By setting the support base 15 and the through holes 151, 152, and half-hole 153 on the support base 15, the transmission rod 12, the clamping rod 13, and the locking rod are guided, ensuring precise axial movement of the three and preventing axial misalignment.

[0046] In this embodiment, a guide sleeve 154 is provided on the bracket 15 at the position corresponding to the half hole. The guide sleeve 154 is slidably sleeved on the self-locking rod 142. By providing the guide sleeve 154, the length of the half hole is extended, and the contact area with the self-locking rod 142 is increased, which enhances the radial support force on the self-locking rod 142. This avoids the problem of easy bending and deformation caused by the self-locking rod 142 and the clamping rod 13 abutting each other during the self-locking process.

[0047] In this embodiment, the second transmission structure includes a first connecting member 161, a second connecting member 162, and a second connecting rod 163. The first connecting member 161 and the second connecting member 162 are respectively connected to the transmission rod 12 and the clamping rod 13. The two ends of the second connecting rod 163 are respectively rotatably connected to the first connecting member 161 and the second connecting member 162. Through the rotatable connection at both ends of the second connecting rod 163, the direction-changing transmission of the transmission rod 12 and the clamping rod 13 is realized.

[0048] In this embodiment, the piston rod 111, transmission rod 12, and self-locking rod 142 are all parallel to the horizontal plane, while the clamping rod 13 and second connecting rod 163 are inclined to the horizontal plane; or the piston rod 111, transmission rod 12, and self-locking rod 142 are all parallel to the vertical plane, while the clamping rod 13 and second connecting rod 163 are inclined to the vertical plane. If applied for lateral clamping, the piston rod 111 is parallel to the horizontal plane; if applied for upper or lower clamping, the piston rod 111 is parallel to the vertical plane.

[0049] The clamping mechanism in this embodiment is applied to the side clamping of the needle bar holder, which is the first setting method described above. Since the clamping rod 13 is inclined to the horizontal plane, the clamping rod 13 clamps at an angle rather than vertically. Therefore, in the inclined clamping method, the increase in clamping force applied by the end face 13a of the clamping rod 13 during the process from contacting the needle bar holder to moving to the clamping point is more gradual, which can further reduce the risk of mechanical damage.

[0050] It should be noted that, in this embodiment, since the second connecting rod 163 is used to drive the clamping rod 13 and the transmission rod 12, it is only necessary to tilt the clamping rod 13 and the second connecting rod 163. More specifically, when drilling and milling the through hole 152 for inserting the clamping rod 13 into the bracket seat 15, it is only necessary to tilt the extension direction of the through hole 152 towards the horizontal plane to make the clamping rod 13 tilt towards the horizontal plane. The first connecting piece 161 and the second connecting piece 162 are respectively sleeved and fixed on the transmission rod 12 and the clamping rod 13. It is only necessary to tilt the first connecting piece 161 towards the vertical direction when it is sleeved and assembled on the transmission rod 12 to make the second connecting rod 163 tilt towards the horizontal plane. It is precisely because the second connecting rod 163, the first connecting piece 161, and the second connecting piece 162 are used as the second transmission structure that the piston rod 111 and the transmission rod 12 can be set parallel to the horizontal plane or the vertical plane. Therefore, considering the difficulty and cost of production and manufacturing, the clamping cylinder 11 and the mounting base 112 for installing the clamping cylinder 11 can all be made of common parts. It is only necessary to tilt the bracket base 15 to the horizontal or vertical plane when drilling and milling the through hole, thereby reducing the difficulty and cost of production and manufacturing.

[0051] In this embodiment, the end face 13a of the clamping rod 13 used for clamping is an arc-shaped surface with a raised center, which makes the contact area between the end face 13a and the needle bar frame gradually increase during the clamping process. The contact area is directly proportional to the clamping force, thereby further reducing the risk of mechanical damage.

[0052] In this embodiment, an elastic reset member 131 is provided between the tightening rod 13 and the support base 15. The elastic force generated by the reset member 13 drives the tightening rod 13 to move axially away from the tightening point. The elastic reset member 131 is specifically a reset spring. A flange structure is provided on the tightening rod 13, and the reset spring is sleeved on the outside of the tightening rod 13, with its two ends connected to the flange structure and the support base 15, respectively. The elastic reset member 131 can quickly drive the tightening rod 13 to reset when the tightening is released, thereby improving work efficiency.

[0053] In this embodiment, the first transmission structure includes a first connecting rod 171 and a support 172. One end of the first connecting rod 171 is rotatably connected to the support 172. The first connecting rod 171 has a first connection point 171a and a second connection point 171b, and the distance L1 between the first connection point 171a and the support 172 is greater than the distance L2 between the second connection point 171b and the support 172. One end of the piston rod 111 is rotatably connected to the first connection point 171a, and one end of the transmission rod 12 is rotatably connected to the second connection point 171b. Since L1 is greater than L2, when the clamping cylinder 11 drives the piston rod 111, the axial movement of the piston rod 111 is greater than that of the transmission rod 12, which can reduce the axial movement speed of the clamping rod 13, thereby reducing the risk of mechanical damage.

[0054] In this embodiment, the bottom end of the first connecting rod 171 is rotatably connected to the support 172, the first connection point 171a is located at the top end of the first connecting rod 171, and the second connection point 171b is located in the middle of the first connecting rod 171, so that the axial movement speed of the transmission rod 12 is basically half that of the piston rod 111. The specific positions of the first connection point 171a and the second connection point 171b need to be reasonably set according to the actual application requirements.

[0055] In this embodiment, the piston rod 111 and the transmission rod 12 are rotatably connected to the first connection point 171a and the second connection point 171b, respectively, and are provided with connecting rod connectors 173. The first connecting rod 171 is provided with waist holes 1711 at the first connection point 171a and the second connection point 171b, respectively. The waist holes 1711 extend along the length direction of the first connecting rod 171. The connecting rod connector 173 has a pin 1731. The pin 1731 passes through the waist hole and can slide along the waist hole 1711. When the piston rod 111 and the transmission rod 12 move axially, the pin 1731 will slide along the waist hole 1711, thereby matching the rotation of the first connecting rod 171.

[0056] Implementation Case 2:

[0057] A fixing device for machining a needle bar holder includes a machining table 2. The machining table 2 is provided with at least two side frame support platforms 21 for supporting two side frames 41 of the needle bar holder 4, a front frame clamping platform 22 for abutting against the front frame 42 of the needle bar holder 4, and a clamping mechanism 1 for clamping the rear frame 43 of the needle bar holder 4, as shown in Embodiment 1.

[0058] In this embodiment, the fixing device is used by first placing the two side frames 41 of the needle bar frame 4 on the corresponding side frame support platform 21, and then moving it along the length direction of the needle bar frame 4 until the front frame 42 of the needle bar frame 4 abuts against the front frame tightening platform 22. Then, the tightening mechanism 1 is activated to tighten the rear frame 43 of the needle bar frame 4. The tightening mechanism and the front frame tightening platform 22 cooperate to clamp and fix the needle bar frame 4 along its length direction.

[0059] In this embodiment, the processing table 2 is provided with at least two clamping mechanisms 3 for clamping the two side frames 41 of the needle bar frame 4. The clamping mechanism 3 clamps the side frames 41, that is, clamps and fixes the needle bar frame 4 in the width direction. With the cooperation of the clamping mechanism 1 and the front frame clamping platform 22, the needle bar frame 4 can be fixed in the length and width directions, and then the needle bar frame 4 is drilled.

[0060] In this embodiment, the clamping mechanism 3 includes a clamping cylinder 31, two grippers 32, and a gripper connector 33. The clamping cylinder 31 is disposed on the bottom surface of the processing table 2. The piston rod 311 of the clamping cylinder 31 passes vertically through the processing table 2. The gripper connector 33 is disposed at the top of the piston rod 311. The two grippers 32 are rotatably connected to the gripper connector 33. The two grippers 32 are respectively provided with waist holes 321. The side frame support platform 21 is provided with two positioning pins 211 that pass through the two waist holes 321 and can slide along the waist holes 321. The axial movement of the piston rod 311 of the clamping cylinder 31 can drive the opening and closing of the two grippers 32 to release or clamp the side frame 41 of the needle bar holder 4.

[0061] In this embodiment, the front frame clamping platform 22 is provided with at least one positioning pin 221. The positioning pin 221 is engaged with the needle bar hole on the front frame 42 of the needle bar holder 4. The positioning pin 221 can quickly position the needle bar holder 4 on the processing table 2 and improve the clamping force.

[0062] In this embodiment, the processing table 2 is provided with a middle clamping platform 23, which is used to abut against the middle section 44 of the needle bar frame 4. By setting the middle clamping platform 23, the clamping effect of the fixing device in the length direction of the needle bar frame 4 can be further enhanced.

[0063] In this embodiment, the intermediate clamping platform 23 is provided with at least one positioning pin 231. The positioning pin 231 and the needle bar hole on the intermediate section 44 of the needle bar holder 4 are inserted and engaged, which can further improve the clamping force.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A clamping mechanism, characterized in that, include: The system comprises a clamping cylinder, a transmission rod, a clamping rod, a first transmission structure, a second transmission structure, and a self-locking structure. The first transmission structure drives the piston rod and the transmission rod of the clamping cylinder, causing the piston rod and the transmission rod to move axially synchronously and in the same direction, with the transmission rod's stroke being less than that of the piston rod. The second transmission structure drives the transmission rod and the clamping rod, causing the transmission rod and the clamping rod to move axially synchronously and in opposite directions. The self-locking structure is mounted on the transmission rod and can lock the clamping rod when it moves to the clamping point. The self-locking structure is used to abut against the end face of the clamping rod, which has a centrally raised arc-shaped surface.

2. The tightening mechanism according to claim 1, characterized in that, The self-locking structure includes a self-locking connector and a self-locking rod; the self-locking connector is connected to the transmission rod, and the self-locking rod is connected to the self-locking connector and spaced apart from the transmission rod; as the clamping rod moves axially and gradually approaches the clamping point, the self-locking rod gradually approaches the clamping rod; when the clamping rod moves to the clamping point, one end of the self-locking rod abuts against the body of the clamping rod.

3. The tightening mechanism according to claim 2, characterized in that, It also includes a support base; the transmission rod and the tightening rod both pass through the support base, the self-locking rod passes through the support base, and one end of the self-locking rod can abut against the body of the tightening rod.

4. The clamping mechanism according to claim 3, characterized in that, The bracket base is provided with a guide sleeve that is slidably fitted onto the self-locking rod.

5. The tightening mechanism according to claim 3, characterized in that, The second transmission structure includes a first connecting member, a second connecting member, and a second connecting rod; the first connecting member and the second connecting member are respectively connected to the transmission rod and the clamping rod, and the two ends of the second connecting rod are respectively rotatably connected to the first connecting member and the second connecting member.

6. The tightening mechanism according to claim 5, characterized in that, The piston rod, transmission rod, and self-locking rod are all parallel to the horizontal plane, while the clamping rod and second connecting rod are inclined to the horizontal plane; or the piston rod, transmission rod, and self-locking rod are all parallel to the vertical plane, while the clamping rod and second connecting rod are inclined to the vertical plane.

7. The clamping mechanism according to claim 6, characterized in that, The end face of the clamping rod used for clamping is an arc-shaped surface with a raised center.

8. The tightening mechanism according to claim 3, characterized in that, An elastic reset element is provided between the clamping rod and the support base, and the elastic force generated by the element is used to drive the clamping rod to move axially away from the clamping point.

9. The tightening mechanism according to claim 1, characterized in that, The first transmission structure includes a first connecting rod and a support; one end of the first connecting rod is rotatably connected to the support, the first connecting rod has a first connection point and a second connection point, and the distance between the first connection point and the support is greater than the distance between the second connection point and the support; one end of the piston rod is rotatably connected to the first connection point, and one end of the transmission rod is rotatably connected to the second connection point.

10. The clamping mechanism according to claim 9, characterized in that, The piston rod and the transmission rod are rotatably connected to the first connection point and the second connection point, respectively, and the ends are provided with connecting rod connectors. The first connecting rod is provided with waist holes at the first connection point and the second connection point, and the connecting rod connector has a pin that passes through the waist hole and can slide along the waist hole.

11. A fixing device for machining a needle bar frame, characterized in that, The device includes a processing table; the processing table is provided with at least two side frame support platforms for supporting two side frames of a needle bar holder; the processing table is provided with a front frame clamping platform for abutting against the front frame of the needle bar holder; the processing table is provided with a clamping mechanism as described in any one of claims 1-10 for clamping the rear frame of the needle bar holder.

12. The fixing device according to claim 11, characterized in that, The processing table is equipped with a clamping mechanism for at least two side frames of the needle bar holder.

13. The fixing device according to claim 12, characterized in that, The clamping mechanism includes a clamping cylinder, two grippers, and a gripper connector. The gripper connector is located at the end of the piston rod of the clamping cylinder, and the two grippers are rotatably connected to the gripper connector. Each of the two grippers has a waist hole, and the side frame support platform has two positioning pins that pass through the two waist holes and can slide along the waist holes. The axial movement of the piston rod of the clamping cylinder can drive the opening and closing of the two grippers to release or clamp the side frame of the needle bar holder.

14. The fixing device according to claim 11, characterized in that, At least one positioning pin is provided on the front frame clamping platform, and the positioning pin is engaged with the needle bar hole on the front frame of the needle bar holder.

15. The fixing device according to claim 11, characterized in that, The processing table is equipped with a mid-range clamping platform, which is used to abut against the mid-range of the needle bar frame.

16. The fixing device according to claim 15, characterized in that, At least one positioning pin is provided on the intermediate clamping platform, and the positioning pin is engaged with the needle bar hole on the intermediate section of the needle bar holder.

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