Jig for PCB

Abstract

The utility model relates to a jig for a PCB, which belongs to the field of PCB production equipment and comprises a base, a clamping assembly is arranged on the base and comprises a first clamping strip and a second clamping strip, the first clamping strip and the second clamping strip are arranged left and right and located at the same horizontal height, the first clamping strip and the second clamping strip are arranged in the front-back direction, and the first clamping strip and the second clamping strip are arranged in the front-back direction. A first abutting face is formed on the side wall of the right side of the first clamping strip, a first supporting strip is fixedly arranged on the first abutting face, a second abutting face is formed on the side wall of the left side of the second clamping strip, and a second supporting strip is fixedly arranged on the second abutting face. The upper surface of the first supporting strip and the upper surface of the second supporting strip are located on the same horizontal plane to form a first supporting face. The first clamping strip is fixedly arranged on the base through a first support, and the second clamping strip is arranged on the base in a left-right moving mode through a mounting base. The clamping device is suitable for clamping and fixing the PCB on which the electric appliance element is mounted.

Description

Technical Field

[0001] This utility model relates to the field of PCB manufacturing equipment, and in particular to a jig for PCB manufacturing. Background Technology

[0002] A PCB (Printed Circuit Board) is an infrastructure used to support and connect electronic components. It provides electrical paths through circuit connections so that various electronic components can communicate and function together. PCBs are widely used in various electronic devices, such as mobile phones, computers, televisions, and automotive electronics.

[0003] In the PCB manufacturing process, after automated production, PCBs typically require inspection. For defective products, engineers may need to manually correct them. During this correction, a fixture is used to hold the PCB in place to facilitate the correction process. Patent document CN218243980U discloses a highly adaptable PCB fixture. By incorporating an operating table, lifting slot, placement table, lifting plate, slide bar, and spring, the fixture allows the PCB to be placed on the placement table. Gravity compresses the spring, causing the PCB to enter the lifting slot, facilitating fixation and accommodating PCBs of varying thicknesses. However, because the placement table surface is flat, when placing PCBs with mounted electronic components, the PCB may not be placed stably, potentially damaging the electronic components on the PCB.

[0004] Based on this, the present invention provides a fixture for PCBs to achieve stable placement and fixation of PCBs with surface-mounted electronic components, and to prevent damage to the electronic components on the PCBs caused by the fixture fixing the PCBs. Utility Model Content

[0005] Therefore, it is necessary to provide a fixture for PCBs, including a base, on which a clamping assembly is provided. The clamping assembly includes a first clamping bar and a second clamping bar arranged left and right and at the same horizontal height. The first clamping bar and the second clamping bar are both arranged in the front-back direction. The right sidewall of the first clamping bar forms a first abutting surface, and a first support bar is fixedly provided on the first abutting surface. The left sidewall of the second clamping bar forms a second abutting surface, and a second support bar is fixedly provided on the second abutting surface. The upper surfaces of the first support bar and the second support bar are located on the same horizontal plane, forming a first support surface. The first clamping bar is fixedly mounted on the base via a first bracket, and the second clamping bar is movably mounted on the base via a mounting seat. The mounting seat includes a mounting block, which is fixedly mounted on the base via a second bracket. The mounting block has a through mounting hole along the left-right direction, and a connecting rod is slidably mounted in the mounting hole. A mounting plate is fixedly mounted on the left end of the connecting rod, and the second clamping bar is mounted on the mounting plate via an elastic component. The upper surface of the mounting block has a fixed threaded hole corresponding to the mounting hole, and a fixed screw is mounted in the fixed threaded hole.

[0006] In this invention, a fixture is used to fix the PCB, facilitating manual adjustments by engineers. The PCB fixing process is as follows: First, one side of the lower surface of the PCB is placed against the upper surface of the first support bar, keeping the PCB horizontal. Then, the connecting rod is driven manually or using a cylinder or other driving device, causing the connecting rod to move the mounting plate toward the first clamping bar until the second abutting surface on the second clamping bar abuts against the PCB, and the elastic component is compressed to a certain extent. At this point, the first support surface abuts against the lower surface of the PCB, and the first and second abutting surfaces abut against both sides of the PCB. The PCB is clamped by the first and second clamping bars, thus fixing the PCB. The mounting block has a fixing threaded hole. After the connecting rod completes its movement, the fixing screw in the fixing threaded hole can be tightened to fix the connecting rod, preventing movement of the connecting rod during PCB fixing and thus preventing the PCB from loosening. It is worth noting that to prevent the connecting rod from rotating relative to the mounting block, the connecting rod needs to be a square rod, or at least two cylindrical connecting rods should be used to fix it to the mounting plate.

[0007] In this invention, the contact operation between the first supporting surface, the first contact surface, and the second contact surface and the PCB is performed at the edge of the PCB. Since the edge of the PCB usually does not have circuit structure or electronic components, this invention can effectively avoid damaging the circuit structure and electronic components of the PCB when fixing it. Therefore, this invention can be applied to fixing PCBs with mounted electronic components.

[0008] In this invention, the force applied to the PCB by the first and second abutment surfaces comes from the elastic force of the elastic component on the mounting plate. Compared to directly pressing the second abutment surface onto the PCB using the connecting rod, this avoids excessive pressure from the connecting rod during the pressing process, which could damage the PCB. Furthermore, it reduces the accuracy requirements for the position of the connecting rod during its movement. In addition, for PCBs of the same specification, after adjusting the position of the connecting rod, subsequent fixing of other PCBs can be achieved by moving the mounting plate to clamp the PCB between the first and second clamping bars, without repeatedly operating the connecting rod, thus offering a degree of ease of use.

[0009] Furthermore, the upper end of the first abutting surface is inclined to the right, and the angle between the first abutting surface and the vertical direction is 1-3°; the upper end of the second abutting surface is inclined to the left, and the angle between the second abutting surface and the vertical direction is 1-3°.

[0010] In this invention, the tops of both the first and second abutting surfaces are inclined inwards. Therefore, when the first and second abutting surfaces clamp the PCB, a downward pressure is generated on the side of the PCB, which can further increase the firmness of the clamping assembly for fixing the PCB.

[0011] Furthermore, the mounting plate has through holes at both its front and rear ends. The elastic component includes an adjusting threaded rod passing through the through hole. The left end of the adjusting threaded rod is fixedly connected to the second clamping bar. A cylindrical spring is also sleeved on the adjusting threaded rod. The two ends of the cylindrical spring abut against the second clamping bar and the mounting plate, respectively. An adjusting nut is also sleeved on the adjusting threaded rod, and the adjusting nut abuts against the right side of the mounting plate. The elastic component also includes at least two sliding rods fixedly disposed on the right side wall of the second clamping bar. The mounting plate has sliding holes passing through the sliding rods. The sliding rods pass through the corresponding sliding holes and fit against each other. The sliding rods and the sliding holes are slidably fitted together.

[0012] In this invention, the cylindrical spring located between the second clamping bar and the mounting plate is in a compressed state, used to fix the position of the second clamping bar relative to the mounting plate. When the clamping bar clamps and fixes the PCB, the cylindrical spring is further compressed. At this time, the spring force can press the second clamping bar against the PCB, thus fixing the PCB. During the PCB clamping process, the slide bar fixed to the second clamping bar can support and guide the second clamping bar, preventing it from wobbling and ensuring its clamping accuracy against the PCB.

[0013] In addition, in this invention, the adjusting nut on the adjusting threaded rod is pressed against the mounting plate. By adjusting the position of the adjusting nut on the adjusting threaded rod, the distance between the second clamping bar and the mounting plate, as well as the compression of the cylindrical spring, can also be adjusted.

[0014] Furthermore, a slide rail is fixedly installed on the first bracket. The slide rail is arranged along the front-back direction. Two sliders are slidably arranged on the slide rail. A connecting arm is rotatably arranged on each of the two sliders. The end of the connecting arm away from the slider is pivotally connected to the same mounting part. A top rod is vertically arranged on the mounting part. The top end of the top rod is horizontal, forming a second support surface. The second support surface and the first support surface are located on the same horizontal plane.

[0015] In this invention, the mounting part is connected to two sliders via two connecting arms pivotally mounted thereon. Therefore, by dragging the mounting part, the mounting part can be moved relative to the first bracket within a certain range. At the same time, since the second support surface on the top rod is flush with the first support surface, the movement of the mounting part allows the top rod to support the PCB at a location on the PCB where there are no electronic components, thereby further increasing the firmness of the fixture's fixing structure to the PCB.

[0016] Furthermore, the mounting part is a cylindrical shape with openings at both the top and bottom, and the top rod is a round rod. The top rod is inserted into the mounting part and slidably engaged with it. The inner sidewall of the mounting part has a semi-circular limiting groove along its circumference. The surface of the top rod is provided with a limiting block corresponding to the limiting groove, and the limiting block is slidably embedded in the limiting groove. The inner sidewall of the mounting part is also vertically provided with a sliding groove for the limiting block to pass through, and the top end of the sliding groove is connected to the limiting groove.

[0017] In this invention, the push rod is slidably inserted into the mounting part and can slide up and down and rotate relative to the mounting part. By embedding the limiting block on the push rod into the limiting groove, the push rod and the mounting part can be fixed relative to each other. At this time, the push rod can play the role of supporting the PCB. When the limiting block of the push rod is rotated to the top of the sliding groove, the push rod can be moved downward relative to the mounting part. At this time, the height of the second support surface on the push rod will be lower than the first support surface. When the push rod is moved, it will not come into contact with the electronic components on the fixed PCB, and the position of the push rod can be easily adjusted.

[0018] Furthermore, the end of the connecting arm away from the slider is pivotally connected to the mounting portion via a bearing sleeved on the mounting portion.

[0019] In this invention, a ring structure can be provided at the end of the connecting arm away from the slider for mounting a bearing. Then, the bearing is fitted onto the mounting part to achieve the pivot connection between the connecting arm and the mounting part.

[0020] Furthermore, the slide rail is rod-shaped, and the slider has a mounting hole that passes through the slide rail. The mounting hole is fitted onto the slide rail and slidably engages with the slide rail. The slider also has a fastening threaded hole that communicates with the mounting hole, and a fastening screw is provided in the fastening threaded hole.

[0021] In this invention, the slider is slidably fitted with the slide rail through the mounting hole on it. Therefore, by tightening the fastening screw on the slider, the fastening screw is pressed against the slide rail, which can fix the slider and the slide rail. At this time, the position of the mounting part, that is, the position of the top rod, can be fixed, so that the top rod can provide better support for the PCB.

[0022] The principle and effects of this utility model will be further explained below with reference to the above technical solution and accompanying drawings:

[0023] In this invention, the first clamping strip and the second clamping strip are used to fix the PCB. The first supporting surface is used to abut against the lower surface of the PCB, and the first abutting surface and the second abutting surface are used to abut against both sides of the PCB, thereby achieving the fixation of the PCB. The abutting operation of the first supporting surface, the first abutting surface and the second abutting surface against the PCB is all performed at the edge of the PCB. The edge of the PCB usually does not have circuit structure or electronic components. Therefore, when fixing the PCB, this invention can effectively avoid damaging the circuit structure and electronic components on the PCB. It can be seen that this invention can be applied to the fixation of PCBs with mounted electronic components. Attached Figure Description

[0024] Figure 1 This is a front view of the fixture for PCBs described in an embodiment of the present invention.

[0025] Figure 2 This is a top view of the fixture for PCBs described in an embodiment of the present invention.

[0026] Figure 3 for Figure 2 A magnified view of a portion of the image;

[0027] Figure 4 This is a cross-sectional schematic diagram of the connection structure between the mounting part and the top rod according to an embodiment of the present utility model.

[0028] Attached Figure

[0029] 1-Base, 11-First bracket, 12-Second bracket, 21-First clamping bar, 211-First abutting surface, 212-First support bar, 22-Second clamping bar, 221-Second abutting surface, 222-Second support bar, 23-Mounting block, 231-Connecting rod, 232-Fixing screw, 233-Mounting plate, 234-Adjusting threaded rod, 235-Cylindrical spring, 236-Slide rod, 237-Adjusting nut, 31-Mounting part, 311-Slide groove, 32-Top rod, 321-Limiting block, 33-Connecting arm, 34-Slider, 341-Fasting screw, 35-Slide rail. Detailed Implementation

[0030] To facilitate understanding by those skilled in the art, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0031] like Figure 1-4 A fixture for a PCB includes a base 1, on which a clamping assembly is disposed. The clamping assembly includes a first clamping bar 21 and a second clamping bar 22 disposed horizontally and at the same horizontal level. Both the first clamping bar 21 and the second clamping bar 22 are disposed along a front-back direction. The right sidewall of the first clamping bar 21 forms a first abutment surface 211, on which a first support bar 212 is fixedly disposed. The left sidewall of the second clamping bar 22 forms a second abutment surface 221, on which a second support bar 222 is fixedly disposed. The upper surfaces of the first support bar 212 and the second support bar 222 are located at the same horizontal level, forming a first support surface. A clamping strip 21 is fixedly mounted on the base 1 via a first bracket 11, and a second clamping strip 22 is movably mounted on the base 1 via a mounting seat. The mounting seat includes a mounting block 23, which is fixedly mounted on the base 1 via a second bracket 12. The mounting block 23 has a through mounting hole along the left-right direction, and a connecting rod 231 is slidably mounted in the mounting hole. A mounting plate 233 is fixedly mounted on the left end of the connecting rod 231, and the second clamping strip 22 is mounted on the mounting plate 233 via an elastic component. A fixing threaded hole communicating with the mounting hole is opened on the upper surface of the mounting block 23, and a fixing screw 232 is provided in the fixing threaded hole.

[0032] In this invention, a fixture is used to fix the PCB, facilitating manual adjustments by engineers. The PCB fixing process is as follows: First, one side of the lower surface of the PCB is placed against the upper surface of the first support bar 212, keeping the PCB horizontal. Then, the connecting rod 231 is driven manually or using a cylinder or other driving device, causing the connecting rod 231 to move the mounting plate 233 toward the first clamping bar 21 until the second abutting surface 221 on the second clamping bar 22 abuts against the PCB, and the elastic component is compressed to a certain extent. At this point, the first support surface abuts against the lower surface of the PCB, and the first abutting surface 211 and the second abutting surface 221 abut against both sides of the PCB. The PCB is clamped by the first clamping bar 21 and the second clamping bar 22, thereby fixing the PCB. The mounting block 23 has a fixed threaded hole. After the connecting rod 231 has moved, the fixing screw 232 in the fixed threaded hole can be tightened to fix the connecting rod 231 and prevent the connecting rod 231 from moving during the PCB fixing process, which would cause the PCB to loosen. It is worth noting that in order to prevent the connecting rod 231 from rotating relative to the mounting block 23, the connecting rod 231 needs to be set as a square rod, or at least two cylindrical connecting rods 231 should be used to fix it to the mounting plate 233.

[0033] In this invention, the first supporting surface, the first contact surface 211, and the second contact surface 221 all contact with the PCB at the edge of the PCB. Since the edge of the PCB usually does not have circuit structure or electronic components, this invention can effectively avoid damaging the circuit structure and electronic components of the PCB when fixing it. Therefore, this invention can be applied to fixing PCBs with mounted electronic components.

[0034] In this invention, the force applied to the PCB by the first abutment surface 211 and the second abutment surface 221 comes from the elastic force of the elastic component on the mounting plate 233. Compared with directly pressing the second abutment surface 221 onto the PCB using the connecting rod 231, excessive pressure generated by the connecting rod 231 during the pressing process can be avoided, thus preventing damage to the PCB. Furthermore, the positional accuracy requirement for the connecting rod 231 can be reduced during its movement. In addition, for PCBs of the same specification, after adjusting the position of the connecting rod 231, when fixing other PCBs, the PCB can be clamped between the first clamping bar 21 and the second clamping bar 22 by moving the mounting plate 233, without repeatedly operating the connecting rod 231, which provides a certain degree of ease of use.

[0035] In one embodiment, the upper end of the first abutting surface 211 is inclined to the right, and the angle between the first abutting surface 211 and the vertical direction is 1-3°; the upper end of the second abutting surface 221 is inclined to the left, and the angle between the second abutting surface 221 and the vertical direction is 1-3°.

[0036] In this embodiment, the top ends of the first abutment surface 211 and the second abutment surface 221 are both inclined inward. Therefore, when the first abutment surface 211 and the second abutment surface 221 clamp the PCB, a downward pressure will be generated on the side of the PCB, which can further increase the firmness of the clamping assembly for fixing the PCB.

[0037] In one embodiment, the mounting plate 233 has through holes at both its front and rear ends. The elastic component includes an adjusting threaded rod 234 passing through the through holes. The left end of the adjusting threaded rod 234 is fixedly connected to the second clamping bar 22. A cylindrical spring 235 is also sleeved on the adjusting threaded rod 234. The two ends of the cylindrical spring 235 abut against the second clamping bar 22 and the mounting plate 233, respectively. An adjusting nut 237 is also sleeved on the adjusting threaded rod 234. The adjusting nut 237 abuts against the right side of the mounting plate 233. The elastic component also includes at least two sliding rods 236 fixedly disposed on the right sidewall of the second clamping bar 22. The mounting plate 233 has sliding holes corresponding to the sliding rods 236. The sliding rods 236 pass through the corresponding sliding holes and fit against each other. The sliding rods 236 and the sliding holes are slidably fitted together.

[0038] In this embodiment, the cylindrical spring 235 located between the second clamping bar 22 and the mounting plate 233 is in a compressed state, used to fix the position of the second clamping bar 22 relative to the mounting plate 233. When the clamping bar clamps and fixes the PCB, the cylindrical spring 235 will be further compressed. At this time, the spring force can press the second clamping bar 22 against the PCB, thereby fixing the PCB. During the process of pressing the PCB, the slide bar 236 fixed on the second clamping bar 22 can support and guide the second clamping bar 22, preventing the second clamping bar 22 from shaking and ensuring its clamping accuracy for the PCB.

[0039] In addition, in this embodiment, the adjusting nut 237 on the adjusting threaded rod 234 abuts against the mounting plate 233. By adjusting the position of the adjusting nut 237 on the adjusting threaded rod 234, the distance between the second clamping bar 22 and the mounting plate 233, as well as the compression of the cylindrical spring 235, can also be adjusted.

[0040] In one embodiment, a slide rail 35 is also fixedly mounted on the first bracket 11. The slide rail 35 is arranged along the front-back direction. Two sliders 34 are slidably mounted on the slide rail 35. A connecting arm 33 is rotatably mounted on each of the two sliders 34. The end of the connecting arm 33 away from the slider 34 is pivotally connected to the same mounting part 31. A top rod 32 is vertically mounted on the mounting part 31. The top end of the top rod 32 is horizontal, forming a second support surface. The second support surface and the first support surface are located on the same horizontal plane.

[0041] In this embodiment, the mounting part 31 is connected to two sliders 34 via two connecting arms 33 pivotally connected thereto. Therefore, by dragging the mounting part 31, the mounting part 31 can move relative to the first bracket 11 within a certain range. At the same time, since the second support surface on the top rod 32 is flush with the first support surface, the movement of the mounting part 31 allows the top rod 32 to support the PCB at a position where there are no electronic components on the PCB, thereby further increasing the firmness of the fixture's fixing structure to the PCB.

[0042] In one embodiment, the mounting part 31 is a cylindrical shape with openings at both the top and bottom. The top rod 32 is a cylindrical rod. The top rod 32 is inserted into the mounting part 31 and is slidably fitted with the mounting part 31. The inner sidewall of the mounting part 31 is provided with a semi-circular limiting groove along its circumference. The surface of the top rod 32 is provided with a limiting block 321 corresponding to the limiting groove. The limiting block 321 is slidably embedded in the limiting groove. The inner sidewall of the mounting part 31 is also vertically provided with a sliding groove 311 for the limiting block 321 to pass through. The top end of the sliding groove 311 is connected to the limiting groove.

[0043] In this embodiment, the push rod 32 is slidably inserted into the mounting part 31 and can slide up and down and rotate relative to the mounting part 31. By embedding the limiting block 321 on the push rod 32 into the limiting groove, the push rod 32 and the mounting part 31 can be fixed relative to each other. At this time, the push rod 32 can play the role of supporting the PCB. When the limiting block 321 of the push rod 32 is rotated to the top of the slide groove 311, the push rod 32 can be moved downward relative to the mounting part 31. At this time, the height of the second support surface on the push rod 32 will be lower than the first support surface. At this time, when the push rod 32 is moved, the push rod 32 will not touch the electronic components on the fixed PCB, and the position of the push rod 32 can be easily adjusted.

[0044] In one embodiment, the end of the connecting arm 33 away from the slider 34 is pivotally connected to the mounting portion 31 via a bearing sleeved on the mounting portion 31.

[0045] In this embodiment, a ring structure can be provided at the end of the connecting arm 33 away from the slider 34 for mounting a bearing. Then, the bearing is sleeved on the mounting part 31, so that the connecting arm 33 and the mounting part 31 can be pivotally connected.

[0046] In one embodiment, the slide rail 35 is rod-shaped, and the slider 34 has a mounting hole that passes through the slide rail 35. The mounting hole is sleeved on the slide rail 35 and slidably engaged with the slide rail 35. The slider 34 also has a fastening threaded hole that communicates with the mounting hole, and a fastening screw 341 is provided in the fastening threaded hole.

[0047] In this embodiment, the slider 34 is slidably fitted with the slide rail 35 through the mounting hole on it. Therefore, by tightening the fastening screw 341 on the slider 34, the fastening screw 341 is pressed against the slide rail 35, and the slider 34 and the slide rail 35 can be fixed relatively. At this time, the position of the mounting part 31 can be fixed, that is, the position of the top rod 32 can be fixed, so that the top rod 32 can have a better support effect on the PCB.

[0048] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A fixture for PCBs, characterized in that, The system includes a base on which a clamping assembly is mounted. The clamping assembly includes a first clamping bar and a second clamping bar positioned horizontally at the same horizontal level. Both the first and second clamping bars are arranged along a front-to-back direction. The right sidewall of the first clamping bar forms a first abutment surface, on which a first support bar is fixedly mounted. The left sidewall of the second clamping bar forms a second abutment surface, on which a second support bar is fixedly mounted. The upper surfaces of the first and second support bars are at the same horizontal level, forming a first support surface. The first clamping bar passes through a first... A bracket is fixedly mounted on the base, and the second clamping bar is movably mounted on the base via a mounting seat. The mounting seat includes a mounting block, which is fixedly mounted on the base via the second bracket. The mounting block has a through mounting hole along the left-right direction, and a connecting rod is slidably mounted in the mounting hole. A mounting plate is fixedly mounted on the left end of the connecting rod, and the second clamping bar is mounted on the mounting plate via an elastic component. The upper surface of the mounting block has a fixed threaded hole corresponding to the mounting hole, and a fixing screw is mounted in the fixed threaded hole.

2. A fixture for PCBs according to claim 1, characterized in that, The upper end of the first abutting surface is inclined to the right, and the angle between the first abutting surface and the vertical direction is 1-3°. The upper end of the second abutting surface is inclined to the left, and the angle between the second abutting surface and the vertical direction is 1-3°.

3. A fixture for PCBs according to claim 1 or 2, characterized in that, The mounting plate has through holes at both its front and rear ends. The elastic component includes an adjusting threaded rod passing through the through holes. The left end of the adjusting threaded rod is fixedly connected to the second clamping bar. A cylindrical spring is also sleeved on the adjusting threaded rod. The two ends of the cylindrical spring abut against the second clamping bar and the mounting plate, respectively. An adjusting nut is also sleeved on the adjusting threaded rod, and the adjusting nut abuts against the right side of the mounting plate. The elastic component also includes at least two sliding rods fixedly disposed on the right side wall of the second clamping bar. The mounting plate has sliding holes passing through the sliding rods. The sliding rods pass through the corresponding sliding holes and fit against each other. The sliding rods and the sliding holes are slidably fitted together.

4. A fixture for PCBs according to claim 3, characterized in that, The first bracket is also fixedly provided with a slide rail, which is arranged along the front-back direction. Two sliders are slidably arranged on the slide rail. A connecting arm is rotatably arranged on each of the two sliders. The end of the connecting arm away from the slider is pivotally connected to the same mounting part. A top rod is vertically arranged on the mounting part. The top end of the top rod is horizontal, forming a second support surface. The second support surface and the first support surface are located on the same horizontal plane.

5. A fixture for PCBs according to claim 4, characterized in that, The mounting part is a cylindrical shape with openings at both the top and bottom. The top rod is a cylindrical rod. The top rod is inserted into the mounting part and slidably engaged with it. The inner sidewall of the mounting part has a semi-circular limiting groove along its circumference. The surface of the top rod is provided with a limiting block corresponding to the limiting groove. The limiting block is slidably embedded in the limiting groove. The inner sidewall of the mounting part is also vertically provided with a sliding groove for the limiting block to pass through. The top end of the sliding groove is connected to the limiting groove.

6. A fixture for PCBs according to claim 5, characterized in that, The end of the connecting arm away from the slider is pivotally connected to the mounting part via a bearing sleeved on the mounting part.

7. A fixture for PCBs according to claim 4, characterized in that, The slide rail is rod-shaped, and the slider has a mounting hole that passes through the slide rail. The mounting hole is fitted onto the slide rail and slidably engages with the slide rail. The slider also has a fastening threaded hole that communicates with the mounting hole, and a fastening screw is provided in the fastening threaded hole.

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