Defect detection device for blow molding products

Abstract

The defect detection device comprises a base, a lifting seat is arranged at the top of the base, a workpiece seat is arranged at the top of the lifting seat, supporting frames are symmetrically and fixedly connected to the tops of the two sides of the lifting seat, and a support is rotationally connected to the middle of the bottom end of the workpiece seat. According to the invention, when the wall thickness at the detection point a needs to be detected, the workpiece seat and the blow-molded product on the workpiece seat are rotated, different positions of the side wall of the blow-molded product can be detected in cooperation with the lifting mechanism, and when the wall thickness at the detection point b is detected, the workpiece seat is turned over until the blow-molded product at the detection point b is vertically arranged, so that the blow-molded product is detected. According to the defect detection device for the blow-molded product, the wall thickness of the blow-molded product at the detection point b can be detected through the laser ranging assembly, the wall thickness of the blow-molded product can be detected more comprehensively according to needs through the defect detection device for the blow-molded product, detection blind areas are avoided, and the detection precision of the blow-molded product is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of blow molded product detection, and specifically provides a defect detection device for blow molded products. Background Art

[0002] Extrusion blow molding is a method for manufacturing hollow thermoplastic parts. Well-known blow molded objects include bottles, barrels, cans, boxes, and all containers for packaging food, beverages, cosmetics, pharmaceuticals, and daily necessities. During the production process of blow molded products, a defect detection device for blow molded products is required to detect the wall thickness of blow molded products.

[0003] Currently, for the defect detection device of blow molded products, for example, a defect detection device for blow molded products proposed in the publication number: CN115178477B includes a clamping device for clamping during defect detection of blow molded products, an appearance detection component for appearance detection of blow molded products, a wall thickness detection component for wall thickness detection of blow molded products, and a quality evaluation component. The quality evaluation component is respectively connected to the clamping device, the appearance detection component, and the wall thickness detection component, and is used to adjust the operating states of each component during defect detection and judge whether the blow molded product is qualified according to the detection results. In this application, by adding a wall thickness detection component, the wall thickness detection of blow molded products is specifically carried out, improving the detection process of blow molded products, making the produced blow molded products have high product stability, and increasing the quality of blow molded products.

[0004] When the existing defect detection device for blow molded products is in use, although by adding a wall thickness detection component to specifically detect the wall thickness of blow molded products and increasing the quality of blow molded products, it is found in use that the existing wall thickness detection component can only detect the vertical side walls of the products. As Figure 7 shown, the prior art can only detect the side walls at the detection point a, and the outer diameter near the opening gradually decreases, making the side walls at the detection point b in an inclined state. The existing detection component cannot detect the side walls at the detection point b, resulting in a blind area in the wall thickness detection of blow molded products, greatly affecting the accuracy of detection, making the detection accuracy low and inconvenient to use. Therefore, we propose a defect detection device for blow molded products to solve the problems raised. Summary of the Invention

[0005] The purpose of the present invention is to provide a defect detection device for blow molded products to solve the problems in the current market proposed in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A defect detection device for blow molded products includes a base, a lifting seat is arranged on the top of the base, and a workpiece seat is arranged on the top of the lifting seat. Among them, On both sides of the top of the lifting seat, there are symmetrically fixedly connected support frames. In the middle of the bottom end of the workpiece seat, there is a rotatably connected support. On both sides of the support, there are symmetrically fixedly connected support arms. At the positions corresponding to the support arms on both sides of the lifting seat, there are respectively rotatably connected a first rotating shaft and a second rotating shaft. On the first rotating shaft and the second rotating shaft, there are respectively fixedly connected a first reversing gear and a second reversing gear. At the bottom corresponding to the first reversing gear and the second reversing gear of the workpiece seat, there is a fixedly connected annular reversing gear. At the end of the support arm, there is a slot opened. On one side of the slot corresponding to the first reversing gear and the second reversing gear, there is a fixedly connected support rod. Above both sides of the lifting seat, there are symmetrically installed a first motor and a second motor. At the shaft ends of the first rotating shaft and the second rotating shaft located outside the support frame, there are respectively fixedly connected a first transmission gear. At the shaft ends of the first motor and the second motor corresponding to the first transmission gear, there are respectively fixedly connected a second transmission gear. Between the first transmission gear and the second transmission gear, there is a connection through a toothed belt. The lifting seat drives its relative lifting with the base through a lifting mechanism.

[0007] Preferably, both the first reversing gear and the second reversing gear are meshed with the annular reversing gear.

[0008] Preferably, the support rod is a cylinder, and the outer diameter of the support rod is in line with the inner diameter of the slot.

[0009] Preferably, the tooth pitches of the first transmission gear, the second transmission gear and the toothed belt are equal, and the toothed belt is respectively meshed with the first transmission gear and the second transmission gear.

[0010] Preferably, the lifting mechanism includes a sliding seat. In the middle of the bottom end of the lifting seat, there is a fixedly connected sliding seat. At the bottom of the sliding seat, there are symmetrically opened sliding grooves. In the sliding grooves, there are sliding blocks. A lead screw penetrates through the sliding grooves. At the bottom end of the sliding block, there is a fixedly connected sliding frame. At the bottom of the sliding frame, there are symmetrically rotatably connected transmission rods. The ends of the transmission rods away from the sliding frame are rotatably connected to the top of the base. When the second transmission gear rotates, it can drive the lead screw to rotate synchronously through a transmission mechanism.

[0011] Preferably, there are two sections of opposite external threads arranged on the lead screw, and the lead screw is threadedly connected to the sliding blocks on both sides through the two sections of opposite external threads respectively.

[0012] Preferably, the transmission mechanism includes a driven gear. At both ends of the lead screw, there are symmetrically fixedly connected driven gears. At the end of the second transmission gear, there is a fixedly connected sliding rod. At the end of the sliding rod away from the second transmission gear, there is a fixedly connected baffle. An active gear is sleeved on the sliding rod. The active gear is sleeved on the sliding rod through a sliding rod groove. A spring is sleeved on the sliding rod between the active gear and the baffle. An electric telescopic rod is installed on one side of the support frame corresponding to the active gear.

[0013] Preferably, the pitch of the driven gear is equal to that of the driving gear.

[0014] Preferably, the slide bar is rectangular columnar, and the external dimensions of the slide bar match the internal dimensions of the slide bar groove.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: In the present invention, the first motor and the second motor respectively drive the first reversing gear and the second reversing gear to rotate. When the first reversing gear and the second reversing gear rotate in opposite directions, the annular reversing gear can drive the workpiece seat and the blow molding product thereon to rotate. When the first reversing gear and the second reversing gear rotate in opposite directions, the workpiece seat can be driven to flip around the support rod as the center. When it is necessary to detect the wall thickness at the detection point a, the workpiece seat and the blow molding product thereon are rotated. Cooperating with the lifting mechanism, different positions on the side wall of the blow molding product can be detected. When detecting the wall thickness at the detection point b, the workpiece seat is flipped until the blow molding product at the detection point b is vertically arranged, and then the wall thickness of the blow molding product at the detection point b can be detected through the laser ranging component. Through this defect detection device for blow molding products, the wall thickness of the blow molding product can be detected more comprehensively as required, avoiding detection blind spots and effectively improving the detection accuracy of the blow molding product.

[0016] In the present invention, when it is necessary to detect the side wall at the detection point a with different heights, the second reversing gear drives the lead screw to rotate through the transmission mechanism. When the lead screw rotates, two opposite external threads can drive the two side sliders to move in opposite directions, thereby driving the sliding frames to approach or move away from each other. Then, through the transmission rods distributed in an inverted V shape, the lifting seat can be driven to rise and fall, and then the workpiece seat and the blow molding product thereon can be lifted and lowered to detect the side wall at the detection point a with different heights.

[0017] In the present invention, in the initial state, the driving gear is misaligned with the driven gear through the spring, so that the first motor and the second motor can drive the workpiece seat to rotate. When the lifting mechanism needs to work, the electric telescopic rod can push the driving gear to move towards the driven gear against the spring force, so that the driving gear meshes with the driven gear. When the second transmission gear rotates, the driving gear is driven to rotate synchronously through the slide bar. The driving gear drives the driven gear to rotate through meshing, so that the driven gear drives the lead screw to rotate. Through the two sets of transmission mechanisms provided, and the two sets of transmission mechanisms are respectively composed of the first motor and the second motor. The electric telescopic rod can select the transmission gear that needs to work, and then the forward and reverse rotation of the lead screw can be controlled. Through the forward and reverse rotation of the lead screw, the lifting and lowering of the lifting mechanism can be controlled. Description of the Drawings

[0018] Figure 1Schematic structural diagram of the present invention; Figure 2 Schematic three-dimensional structural diagram of the present invention; Figure 3 Schematic structural diagram of the lifting mechanism of the present invention; Figure 4 Schematic three-dimensional structural diagram of the bracket of the present invention; Figure 5 For the present invention Figure 1 Partial enlarged structural diagram at position A in the present invention; Figure 6 For the present invention Figure 3 Partial enlarged structural diagram at position B in the present invention; Figure 7 Schematic structural diagram of the blow-molded product to be detected of the present invention.

[0019] In the figure: 1, base; 2, lifting seat; 3, workpiece seat; 4, support frame; 5, bracket; 6, support arm; 7, first rotating shaft; 8, second rotating shaft; 9, first reversing gear; 10, second reversing gear; 11, annular reversing gear; 12, slot; 13, support rod; 14, first motor; 15, second motor; 16, first transmission gear; 17, second transmission gear; 18, toothed belt; 19, sliding seat; 20, chute; 21, slider; 22, lead screw; 23, sliding frame; 24, transmission rod; 25, driven gear; 26, sliding rod; 27, baffle; 28, driving gear; 29, sliding rod groove; 30, spring; 31, electric telescopic rod. Specific embodiments

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. Embodiment

[0021] Please refer to Figures 1 to 7 , the present invention provides a technical solution: a defect detection device for blow-molded products, including a base 1, a lifting seat 2 is arranged on the top of the base 1, and a workpiece seat 3 is arranged on the top of the lifting seat 2. Among them, On both sides of the top of the lifting seat 2, there are symmetrically fixedly connected support frames 4. In the middle of the bottom end of the workpiece seat 3, there is a rotatably connected support 5. On both sides of the support 5, there are symmetrically fixedly connected support arms 6. At the positions corresponding to the support arms 6 on both sides of the lifting seat 2, there are respectively rotatably connected a first rotating shaft 7 and a second rotating shaft 8. A first reversing gear 9 and a second reversing gear 10 are respectively fixedly connected to the first rotating shaft 7 and the second rotating shaft 8. At the bottom corresponding to the first reversing gear 9 and the second reversing gear 10 of the workpiece seat 3, there is a fixedly connected annular reversing gear 11. At the end of the support arm 6, there is a slot 12; On one side of the slot 12 corresponding to the first reversing gear 9 and the second reversing gear 10, there are respectively fixedly connected support rods 13. Above both sides of the lifting seat 2, there are symmetrically installed a first motor 14 and a second motor 15. At the shaft ends of the first rotating shaft 7 and the second rotating shaft 8 located outside the support frame 4, there are respectively fixedly connected first transmission gears 16. At the shaft ends of the first motor 14 and the second motor 15 corresponding to the first transmission gears 16, there are respectively fixedly connected second transmission gears 17. The first transmission gear 16 and the second transmission gear 17 are connected by a toothed belt 18. The lifting seat 2 drives its relative lifting with the base 1 through a lifting mechanism; When detecting the wall thickness of the blow molded product, place the blow molded product on the workpiece seat 3 and position the blow molded product through a fixture (the fixture is a commonly used clamping structure in the prior art, so the fixture and its working principle are not described in this solution and the prior art is directly cited). When it is necessary to detect the wall thickness at the detection point a, make the first motor 14 and the second motor 15 respectively drive the first reversing gear 9 and the second reversing gear 10 to rotate in opposite directions, so that the first reversing gear 9 and the second reversing gear 10 drive the workpiece seat 3 and the blow molded product thereon to rotate through the annular reversing gear 11. Cooperating with the lifting mechanism, different positions on the side wall of the blow molded product can be detected. When detecting the wall thickness at the detection point b, make the first motor 14 and the second motor 15 drive the first reversing gear 9 and the second reversing gear 10 to rotate in the same direction, so that the first reversing gear 9 and the second reversing gear 10 drive the workpiece seat 3 to flip around the support rod 13 as the center until the blow molded product at the detection point b is vertically arranged. Then, through the laser ranging component (detecting the wall thickness of the product by laser ranging is the prior art and is directly cited in this solution, so its structure and working principle are not described), the wall thickness of the blow molded product at the detection point b can be detected. Through this defect detection device for blow molded products, the wall thickness of the blow molded product can be more comprehensively detected according to requirements, avoiding detection blind spots and effectively improving the detection accuracy of the blow molded product.

[0022] Please refer to Figures 1 to 7, the first reversing gear 9 and the second reversing gear 10 are both meshed with the annular reversing gear 11. The support rod 13 is a cylinder, and the outer diameter of the support rod 13 is in line with the inner diameter of the slot 12. The pitch of the first transmission gear 16, the second transmission gear 17 and the toothed belt 18 is equal, and the toothed belt 18 is meshed with the first transmission gear 16 and the second transmission gear 17 respectively. When the first motor 14 and the second motor 15 are working, they can drive the second transmission gear 17 to rotate. The second transmission gear 17 drives the first transmission gear 16 to rotate through the toothed belt 18, so that the first transmission gears 16 on both sides can drive the first reversing gear 9 and the second reversing gear 10 to rotate.

[0023] Please refer to Figures 1 to 7 , the lifting mechanism includes a sliding seat 19. The middle part of the bottom end of the lifting seat 2 is fixedly connected with the sliding seat 19. The bottom of the sliding seat 19 is symmetrically provided with sliding grooves 20. Sliding blocks 21 are arranged in the sliding grooves 20. A lead screw 22 passes through the sliding grooves 20. The bottom end of the sliding block 21 is fixedly connected with a sliding frame 23. The bottom of the sliding frame 23 is symmetrically and rotatably connected with transmission rods 24. One end of the transmission rod 24 away from the sliding frame 23 is rotatably connected with the top of the base 1. When the second transmission gear 17 rotates, it can drive the lead screw 22 to rotate synchronously through the transmission mechanism. There are two sections of opposite external threads on the lead screw 22, and the lead screw 22 is threadedly connected with the sliding blocks 21 on both sides through the two sections of opposite external threads respectively. When it is necessary to detect the side wall at the detection point a at different heights, the second reversing gear 10 drives the lead screw 22 to rotate through the transmission mechanism. When the lead screw 22 rotates, it can drive the sliding blocks 21 on both sides to move in opposite directions through the two sections of opposite external threads, and then drive the sliding frames 23 to approach or move away from each other. Furthermore, through the transmission rods 24 distributed in an inverted V shape, the lifting seat 2 can be driven to lift, and then the workpiece seat 3 and the blow molded products thereon can be lifted to detect the side wall at the detection point a at different heights.

[0024] Please refer to Figures 1 to 7, the transmission mechanism includes a driven gear 25. Driven gears 25 are symmetrically and fixedly connected to both ends of the lead screw 22. A slide bar 26 is fixedly connected to the end of the second transmission gear 17. A baffle 27 is fixedly connected to the end of the slide bar 26 away from the second transmission gear 17. A driving gear 28 is sleeved on the slide bar 26. The driving gear 28 is sleeved on the slide bar 26 through a slide bar groove 29. A spring 30 is sleeved on the slide bar 26 between the driving gear 28 and the baffle 27. An electric telescopic rod 31 is installed on one side of the support frame 4 corresponding to the driving gear 28. The pitch of the driven gear 25 and the driving gear 28 is equal. The slide bar 26 is rectangular columnar, and the external dimension of the slide bar 26 matches the internal dimension of the slide bar groove 29. In the initial state, the driving gear 28 is displaced from the driven gear 25 by the spring 30, enabling the first motor 14 and the second motor 15 to drive the workpiece seat 3 to rotate. When the lifting mechanism needs to work, the electric telescopic rod 31 can push the driving gear 28 to move towards the driven gear 25 against the elastic force of the spring 30, causing the driving gear 28 to mesh with the driven gear 25. When the second transmission gear 17 rotates, it drives the driving gear 28 to rotate synchronously through the slide bar 26. The driving gear 28 drives the driven gear 25 to rotate through meshing, causing the driven gear 25 to drive the lead screw 22 to rotate. By providing two sets of transmission mechanisms, and the two sets of transmission mechanisms are respectively driven by the first motor 14 and the second motor 15. The electric telescopic rod 31 can select the transmission gear that needs to work, thereby being able to control the forward and reverse rotation of the lead screw 22. Through the forward and reverse rotation of the lead screw 22, the lifting mechanism can be controlled to lift and lower.

[0025] Working principle: For a defect detection device for blow molded products, when detecting the wall thickness of a blow molded product, the blow molded product is placed on the workpiece seat 3, and the blow molded product is positioned by a fixture (the fixture is a commonly used clamping structure in the prior art, so the fixture and its working principle are not described in this solution, and the prior art is directly cited). When it is necessary to detect the wall thickness at the detection point a, the first motor 14 and the second motor 15 drive the first reversing gear 9 and the second reversing gear 10 to rotate in opposite directions respectively, so that the first reversing gear 9 and the second reversing gear 10 drive the workpiece seat 3 and the blow molded product thereon to rotate through the annular reversing gear 11. Cooperating with the lifting mechanism, different positions on the side wall of the blow molded product can be detected. When detecting the wall thickness at the detection point b, the first motor 14 and the second motor 15 drive the first reversing gear 9 and the second reversing gear 10 to rotate in the same direction, so that the first reversing gear 9 and the second reversing gear 10 drive the workpiece seat 3 to flip around the support rod 13 as the center until the blow molded product at the detection point b is vertically arranged. Then, the wall thickness of the blow molded product at the detection point b can be detected by the laser ranging component (detecting the wall thickness of the product by laser ranging is the prior art, which is directly cited in this solution, so its structure and working principle are not described). Through this defect detection device for blow molded products, the wall thickness of the blow molded product can be detected more comprehensively as required, avoiding detection blind spots, and effectively improving the detection accuracy of the blow molded product; When the first motor 14 and the second motor 15 are working, they can drive the second transmission gear 17 to rotate. The second transmission gear 17 drives the first transmission gear 16 to rotate through the toothed belt 18, so that the first transmission gears 16 on both sides can drive the first reversing gear 9 and the second reversing gear 10 to rotate. And when it is necessary to detect the side walls at the detection points a at different heights, the second reversing gear 10 drives the lead screw 22 to rotate through the transmission mechanism. When the lead screw 22 rotates, it can drive the sliders 21 on both sides to move in opposite directions through two sections of opposite external threads, and then drive the sliding frames 23 to approach or move away from each other. Furthermore, through the transmission rods 24 distributed in an inverted V shape, the lifting seat 2 can be driven to lift, and then drive the workpiece seat 3 and the blow molded products thereon to lift, so as to detect the side walls at the detection points a at different heights. And in the initial state, the driving gear 28 is displaced from the driven gear 25 through the spring 30, so that the first motor 14 and the second motor 15 can drive the workpiece seat 3 to rotate. When the lifting mechanism needs to work, the electric telescopic rod 31 can push the driving gear 28 to move towards the driven gear 25 against the elastic force of the spring 30, so that the driving gear 28 meshes with the driven gear 25. When the second transmission gear 17 rotates, it drives the driving gear 28 to rotate synchronously through the slide rod 26. The driving gear 28 drives the driven gear 25 to rotate through meshing, so that the driven gear 25 drives the lead screw 22 to rotate. Through the two sets of transmission mechanisms provided, and the two sets of transmission mechanisms are respectively composed of the first motor 14 and the second motor 15. The electric telescopic rod 31 can select the transmission gear that needs to work, and then can control the forward and reverse rotation of the lead screw 22. Through the forward and reverse rotation of the lead screw 22, the lifting mechanism can be controlled to lift.

[0026] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A defect detection device for blow-molded products, comprising a base (1), characterized in that: A lifting seat (2) is arranged on the top of the base (1), and a workpiece seat (3) is arranged on the top of the lifting seat (2), wherein: The top of both sides of the lifting seat (2) are symmetrically fixedly connected with support frames (4), the middle of the bottom end of the workpiece seat (3) is rotatably connected with a support frame (5), and the two sides of the support frame (5) are symmetrically fixedly connected with support arms (6), and the positions of the support frames (4) on both sides of the lifting seat (2) corresponding to the support arms (6) are respectively rotatably connected with a first rotating shaft (7) and a second rotating shaft (8), and the first rotating shaft (7) and the second rotating shaft (8) are respectively fixedly connected with a first reversing gear (9) and a second reversing gear (10), and the bottom of the workpiece seat (3) corresponding to the first reversing gear (9) and the second reversing gear (10) is fixedly connected with an annular reversing gear (11), and the end of the support arm (6) is provided with a slot (12); The first reversing gear (9) and the second reversing gear (10) are fixedly connected to a support rod (13) on one side corresponding to the slot (12); a first motor (14) and a second motor (15) are symmetrically mounted on the upper sides of the lifting seat (2); the shaft ends of the first rotating shaft (7) and the second rotating shaft (8) located outside the support frame (4) are fixedly connected to a first transmission gear (16); the shaft ends of the first motor (14) and the second motor (15) corresponding to the first transmission gear (16) are fixedly connected to a second transmission gear (17); the first transmission gear (16) and the second transmission gear (17) are connected via a toothed belt (18); and the lifting seat (2) is driven by a lifting mechanism to be lifted relative to the base (1).

2. The defect detection device for blow molded products according to claim 1, characterized in that: The first reversing gear (9) and the second reversing gear (10) are both meshed with the annular reversing gear (11).

3. The defect detection device for blow molded products according to claim 1, characterized in that: The support rod (13) is a cylinder, and the outer diameter of the support rod (13) matches the inner diameter of the slot (12).

4. The defect detection device for blow molded products according to claim 1, characterized in that: The tooth pitches of the first transmission gear (16), the second transmission gear (17) and the toothed belt (18) are equal, and the toothed belt (18) is meshed with the first transmission gear (16) and the second transmission gear (17) respectively.

5. The defect detection device for blow molded products according to claim 1, characterized in that: The lifting mechanism comprises a sliding seat (19), the sliding seat (19) is fixedly connected to the middle of the bottom end of the lifting seat (2), a sliding groove (20) is symmetrically opened at the bottom of the sliding seat (19), a slider (21) is arranged in the sliding groove (20), a screw rod (22) passes through the sliding groove (20), the bottom end of the slider (21) is fixedly connected to a sliding frame (23), the bottom of the sliding frame (23) is symmetrically rotatably connected to a transmission rod (24), the end of the transmission rod (24) away from the sliding frame (23) is rotatably connected to the top of the base (1), and when the second transmission gear (17) rotates, it can drive the screw rod (22) to rotate synchronously through the transmission mechanism.

6. The defect detection device for blow molded products according to claim 5, characterized in that: The screw rod (22) is provided with two sections of opposite external threads, and the screw rod (22) is threadedly connected to the sliders (21) on both sides through the two sections of opposite external threads.

7. The defect detection device for blow molded products according to claim 5, characterized in that: The transmission mechanism comprises a driven gear (25), the two ends of the lead screw (22) are symmetrically fixedly connected to the driven gears (25), the end of the second transmission gear (17) is fixedly connected to a slide rod (26), the end of the slide rod (26) away from the second transmission gear (17) is fixedly connected to a baffle (27), a driving gear (28) is sleeved on the slide rod (26), the driving gear (28) is sleeved on the slide rod (26) through a slide rod groove (29), a spring (30) is sleeved on the slide rod (26) between the driving gear (28) and the baffle (27), and an electric telescopic rod (31) is installed on the side of the support frame (4) corresponding to the driving gear (28).

8. The defect detection device for blow molded products according to claim 7, characterized in that: The driven gear (25) and the driving gear (28) have the same tooth pitch.

9. The defect detection device for blow molded products according to claim 7, characterized in that: The slide bar (26) is in the shape of a rectangular column, and the outer dimensions of the slide bar (26) coincide with the inner dimensions of the slide bar groove (29).

Images