Method and device for precise detection and calibration of relative position of chain and sprocket

Abstract

The application provides a kind of chain shell relative position precision detection and calibration method and device, belongs to the field of aviation technology, the gauge is installed and fixed in the center table upper and lower ends;Conical sleeve is fixed with center table, and with center table through hole coaxial same diameter;Telescopic actuator cylinder is hollow cylindrical structure, with telescopic actuator rod front end cooperation;Telescopic actuator rod rear end is connected with handle, telescopic actuator rod middle boss extends into conical sleeve groove;Snap ring is arranged on the lower end gauge, and is fixed with telescopic actuator cylinder;When counterclockwise rotating handle, telescopic actuator rod is rotated into telescopic actuator cylinder, telescopic actuator cylinder retreats, the distance between nose rectangular block and rectangular ruler step becomes smaller;When clockwise rotating handle, telescopic actuator rod is rotated out of telescopic actuator cylinder, telescopic actuator cylinder advances, the distance between nose rectangular block and rectangular ruler step becomes larger;Nose rectangular block is located on the opposite side of telescopic actuator cylinder most front end snap ring.The application can replace traditional multiple measurement reading method, improve efficiency and precision.

Description

Technical Field

[0001] This invention belongs to the field of aerospace technology, and in particular relates to a method and apparatus for precise detection and calibration of the relative position of chain and shell mating. Background Technology

[0002] In industrial assembly, products with strip-shaped shells, such as metal cosmetic bottles and various gas tanks, are often assembled into sequences using chain clamps for fixing and connection, serving as preliminary assemblies for further processing or continuous use. The relative position of the strip-shaped shell and the chain clamp is crucial. If the relative position is not precise enough, or the relative dimensions are outside the tolerance range, product jamming may occur during subsequent continuous processing or use. Severe jamming can endanger the safety of processing machines or operators. Therefore, to accurately ensure the relative position and dimensions of the strip-shaped shell and the chain clamp are within tolerance, it is generally necessary to measure using two types of specialized gauges after preliminary assembly. The measurement typically measures the distance between the bottom plane of the shell and the flange of the chain clamp, known as the chain-shell distance. The large gauge measurement indicates whether the chain-shell distance is greater than the tolerance range, while the small gauge measurement indicates whether the chain-shell distance is less than the tolerance range. If the chain shell distance is within the tolerance range, it is acceptable. If the chain shell distance is greater or less than the tolerance range, the relative position of the chain shells needs to be adjusted. If the chain shell distance is greater than the tolerance range, a wooden mallet is generally used to gently push the shell into a deeper position where the chain is stuck. If the chain shell distance is less than the tolerance range, the shell is generally removed and then pressed down again.

[0003] Whether using special gauges of different sizes to measure the chain-shell distance or the two traditional methods of adjusting the relative position of the chain-shells, both are very time-consuming and labor-intensive. Moreover, the two traditional methods of adjusting the relative position of the chain-shells are coarse adjustments, not precise enough, and may involve repeated adjustments. Summary of the Invention

[0004] To address the problems of low efficiency and insufficient accuracy in measuring chain-shell distance in existing technologies, this invention provides a method and apparatus for precise detection and calibration of the relative position of the chain-shell assembly. It employs a direct, one-time measurement method to replace the traditional multiple-measurement method, improving efficiency and reducing human error. This method overcomes the limitations of traditional methods for adjusting the relative position of the chain-shell, which are often crude, imprecise, and prone to repetitive and time-consuming adjustments. It is scientifically sound, practical, and improves both efficiency and accuracy. The technical solution is as follows:

[0005] In the first aspect, a device for precise detection and calibration of the relative position of chain housing is provided, comprising: a nose rectangular block 100, a telescopic actuator cylinder 200, a gauge 300, a retaining ring 400, a center platform 500, a conical sleeve 600, a telescopic actuator rod 700, and a handle 800.

[0006] The gauge 300 is installed and fixed at both ends of the center platform 500;

[0007] The tapered sleeve 600 is fixedly connected to the center platform 500 and is coaxial with the through hole of the center platform 500 and has the same diameter; the telescopic actuator 200 is a hollow cylindrical structure with internal threads, which are threaded to the front end of the telescopic actuator 700; the rear end of the telescopic actuator 700 is connected to the handle 800, and the middle boss of the telescopic actuator 700 extends into the groove of the tapered sleeve 600 to ensure that the telescopic actuator 700 can only rotate around its axis and cannot slide;

[0008] The retaining ring 400 is arranged on the lower end of the gauge 300 and is fixedly connected to the telescopic actuator 200;

[0009] When the handle 800 is turned counterclockwise, the telescopic actuator 700 screws into the telescopic actuator cylinder 200. Since the telescopic actuator 700 is limited by the conical sleeve 600, the telescopic actuator cylinder 200 moves backward, and the distance between the nose rectangular block 100 and the rectangular step becomes smaller. When the handle 800 is turned clockwise, the telescopic actuator 700 screws out of the telescopic actuator cylinder 200. Since the telescopic actuator 700 is limited by the conical sleeve 600, the telescopic actuator cylinder 200 moves forward, and the distance between the nose rectangular block 100 and the rectangular step becomes larger.

[0010] The nose rectangular block 100 is arranged on the opposite side of the frontmost retaining ring 400 of the telescopic actuator cylinder 200. Its main function is to use the nose rectangular block 100 to hold the front flange of the chain when the distance between the bottom end of the strip shell and the rear flange of the chain is greater than the upper tolerance limit, that is, when the distance between the bottom end of the strip shell and the rear flange of the chain is too large.

[0011] Optionally, gauge 300 consists of a small rectangular ruler 301, an upper tolerance limit line 302, a lower tolerance limit line 303, a large rectangular ruler 304, and a fork-shaped base plate 305.

[0012] The large rectangular ruler 304 is vertically installed and fixed on the fork-shaped base plate 305, and the top of the large rectangular ruler 304 is flush with the top of the fork-shaped base plate 305; the small rectangular ruler 301 is an extension of the large rectangular ruler 304, with the lower tolerance limit line 303 as the boundary, and the small rectangular ruler 301 and the large rectangular ruler 304 form a rectangular ruler step due to the height difference; the fork-shaped base plate 305 is designed with a fork-shaped structure; the upper tolerance limit line 302 is located at the front end of the lower tolerance limit line 303, the two are parallel, and the two are parallel to the fork-shaped base plate 305 to ensure measurement accuracy.

[0013] Optionally, the upper tolerance limit line 302, the lower tolerance limit line 303, the retaining ring 400, and the fork-shaped base plate 305 are perpendicular to the main axis of the device.

[0014] The central platform 500 serves as the central mounting point of the entire device. It is a square boss with an outer contour of side length L and an inner contour of a through pipe with a diameter Q and a thickness of 0.5L. L is 1 to 2 centimeters and Q is less than L. Its function is to allow the inner contour of the square boss to accommodate the sliding of the telescopic actuator cylinder within it, while also ensuring that the size of the square boss is not too large, making the entire structure more compact.

[0015] The telescopic actuator cylinder 200, the telescopic actuator rod 700, the through hole of the center platform 500, the conical sleeve 600, and the handle 800 are coaxial, and this axis is the main axis of the device.

[0016] Furthermore, the surface of the handle 800 is provided with anti-slip texture to prevent slipping.

[0017] The retaining ring 400 is located at the front end of the fork-shaped base plate 305 at the lower end. Its main function is to lock the bottom boss of the strip shell when the distance between the bottom end of the strip shell and the rear flange of the retaining chain is less than the lower limit of the tolerance, that is, when the distance between the bottom end of the strip shell and the rear flange of the retaining chain is too small.

[0018] In a second aspect, a method for precise detection and calibration of the relative position of the chain-shell mating is provided, for use in any of the devices described in the first aspect, the method comprising the following steps:

[0019] Step 1: When using the device, prioritize using the non-clamping ring 400 side to check the relative position of the chain and shell. Measure the distance between the bottom of the strip shell and the rear flange of the chain and check if it is greater than the lower tolerance limit and less than the upper tolerance limit. First, fully attach the fork-shaped base plate 305 to the bottom of the strip shell. Keep the main axis of the device parallel to the axis of the strip shell. Determine if the rear edge of the rear flange of the chain is between the upper tolerance limit line 302 and the lower tolerance limit line 303. If so, the relative position of the chain and shell is qualified. If the rear edge of the rear flange of the chain is before the upper tolerance limit line 302, the relative position of the chain and shell is too large, and a push shell operation is required. Proceed to Step 3. If the rear flange of the chain interferes with the large rectangular ruler 304, or if the fork-shaped base plate 305 cannot be attached to the bottom of the strip shell when the rectangular ruler step abuts against the rear flange of the chain, the relative position of the chain and shell is too small, and a pull shell operation is required. Proceed to Step 2.

[0020] Step 2: Use the rectangular step of the side gauge 300 to press against the rear flange of the chain. Turn the handle 800 counterclockwise. The telescopic actuator 200 moves backward with the retaining ring 400, pulling the strip shell slightly backward out of the chain. When the bottom end of the strip shell is completely in contact with the side fork-shaped base plate 305, make sure that the distance between the bottom end of the strip shell and the rear flange of the chain is just at the lower limit of the tolerance. This step is the shell pulling operation.

[0021] Step 3: Using the fork-shaped base plate 305 of the gauge 300, place it against the bottom end of the strip-shaped housing. Turn the handle 800 counterclockwise. The telescopic actuator 200, along with the nose rectangular block 100, moves backward. The fork-shaped base plate 305 pushes the strip-shaped housing forward, slightly pushing it back into the chain. When the rectangular step on this side completely abuts against the rear flange of the chain, ensure that the distance between the bottom end of the strip-shaped housing and the rear flange of the chain is exactly at the upper tolerance limit. This step is the housing pushing operation.

[0022] The beneficial effects of this invention are at least as follows:

[0023] (1) A special gauge based on chain shell distance measurement for specific application scenarios is provided. It adopts an intuitive one-time measurement method to replace the traditional multiple measurement reading method, which improves efficiency and reduces human error.

[0024] (2) A precise method for adjusting the relative position of the chain shell is provided, which changes the traditional method of adjusting the relative position of the chain shell, which is rough, imprecise, and may involve repetition, time and effort. It is scientific, practical, efficient and accurate.

[0025] (3) The device of the present invention has a simple structure, low manufacturing complexity, simple usage, clear and easy-to-understand usage logic, small size and light weight, and good economic efficiency. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the gauge of the present invention;

[0028] Figure 3 This is a schematic diagram of the shell-pushing operation of the present invention;

[0029] Figure 4 This is a schematic diagram of the shell-pulling operation of the present invention. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0031] One embodiment of the present invention provides a device for precise detection and calibration of the relative position of the chain and shell mating parts. Please refer to [link to device]. Figure 1 The device includes: a rectangular block 100 at the nose, a telescopic actuator cylinder 200, a gauge 300, a retaining ring 400, a center platform 500, a conical sleeve 600, a telescopic actuator rod 700, and a handle 800. Among them:

[0032] The gauge 300 consists of a small rectangular ruler 301, an upper tolerance limit line 302, a lower tolerance limit line 303, a large rectangular ruler 304, and a fork-shaped base plate 305.

[0033] Specifically, the system's components and main functions are as follows:

[0034] The device of this invention mainly consists of two parts: a static component and a moving component, such as... Figure 1 As shown. The stationary parts are the center platform 500, gauge 300, and conical sleeve 600, and the moving parts are the nose rectangular block 100, telescopic actuator cylinder 200, retaining ring 400, telescopic actuator rod 700, and handle 800.

[0035] The central platform 500 serves as the central mounting point of the entire device. The central platform 500 is a square boss with an outer contour of side length L and an inner contour of a through pipe with a diameter of Q and a thickness of 0.5L. Generally, L is selected to be 1 to 2 cm, and Q can be slightly smaller than L.

[0036] The core measuring component of this device is gauge 300, which is mounted and fixed at both ends of the central platform 500. For example... Figure 2 As shown, gauge 300 consists of a small rectangular ruler 301, an upper tolerance limit line 302, a lower tolerance limit line 303, a large rectangular ruler 304, and a fork-shaped base plate 305. The large rectangular ruler 304 is vertically mounted and fixed on the fork-shaped base plate 305, and the top of the large rectangular ruler 304 is flush with the top of the fork-shaped base plate 305. The small rectangular ruler 301 is an extension of the large rectangular ruler 304, with the lower tolerance limit line 303 as the boundary, and a rectangular ruler step is formed between the small rectangular ruler 301 and the large rectangular ruler 304 due to the height difference. The fork-shaped base plate 305 is designed with a fork-shaped structure. The upper tolerance limit line 302 is located at the front end of the lower tolerance limit line 303, and the two are parallel. Both are required to maintain a high degree of parallelism with the fork-shaped base plate 305 to ensure measurement accuracy.

[0037] The tapered sleeve 600 is fixedly connected to the center platform 500 and is coaxial with the through hole of the center platform 500 and has the same diameter. The telescopic actuator 200 is a hollow cylindrical structure with internal threads, forming a threaded fit with the front end of the telescopic actuator 700. The rear end of the telescopic actuator 700 is connected to the handle 800. The middle boss of the telescopic actuator 700 extends into the groove of the tapered sleeve 600 to ensure that the telescopic actuator 700 can only rotate around its axis and cannot slide.

[0038] The telescopic actuator cylinder 200, telescopic actuator rod 700, through hole of center platform 500, conical sleeve 600, and handle 800 are strictly coaxial, and this axis is the main axis of the device. Upper tolerance limit line 302, lower tolerance limit line 303, retaining ring 400, and fork-shaped base plate 305 are strictly perpendicular to the main axis of the device. Small rectangular ruler 301 and large rectangular ruler 304 are strictly perpendicular to fork-shaped base plate 305.

[0039] In one embodiment, the handle 800 has anti-slip textures on its surface for gripping purposes. When the handle 800 is turned counterclockwise, the telescopic actuator 700 screws into the telescopic actuator cylinder 200. Because the telescopic actuator 700 is limited by the conical sleeve 600, the telescopic actuator cylinder 200 retracts, and the distance between the nose rectangular block 100 and the rectangular step decreases. When the handle 800 is turned clockwise, the telescopic actuator 700 unscrews out of the telescopic actuator cylinder 200. Because the telescopic actuator 700 is limited by the conical sleeve 600, the telescopic actuator cylinder 200 moves forward, and the distance between the nose rectangular block 100 and the rectangular step increases.

[0040] The retaining ring 400 is arranged at the front end of one of the fork-shaped base plates 305 and is fixedly connected to the telescopic actuator 200. Its main function is to lock the bottom boss of the strip shell when the distance between the bottom end of the strip shell and the rear flange of the retaining chain is less than the lower limit of the tolerance, that is, when the distance between the bottom end of the strip shell and the rear flange of the retaining chain is too small.

[0041] The nose rectangular block 100 is arranged on the opposite side of the frontmost retaining ring 400 of the telescopic actuator cylinder 200. Its main function is to use the nose rectangular block 100 to hold the front flange of the chain when the distance between the bottom end of the strip shell and the rear flange of the chain is greater than the upper tolerance limit, that is, when the distance between the bottom end of the strip shell and the rear flange of the chain is too large.

[0042] The steps for using the device described in this invention are as follows:

[0043] Step 1: During use, prioritize using the non-clamping ring 400 side to check the relative position of the chain and shell. This involves measuring the distance P between the bottom end of the strip shell and the rear flange of the chain, checking if it is greater than the lower tolerance limit and less than the upper tolerance limit. First, fully align the fork-shaped base plate 305 with the bottom end of the strip shell, keeping the main axis of the device parallel to the axis of the strip shell. Observe whether the rear edge of the chain flange is between the upper tolerance limit line 302 and the lower tolerance limit line 303. If so, the relative position of the chain and shell is acceptable. If the rear edge of the chain flange is before the upper tolerance limit line 302, the relative position of the chain and shell is too large, requiring a push-shell operation. Figure 3 As shown, proceed to step 3. If the rear flange of the chain interferes with the large rectangular ruler 304, or if the fork-shaped base plate 305 cannot fit the bottom end of the strip shell when the rectangular ruler step abuts against the rear flange of the chain, then the relative position of the chain and shell is too small, and a shell-pulling operation is required. Figure 4 As shown, proceed to step 2.

[0044] Step 2: The retaining ring 400 is positioned at the front end of one of the fork-shaped base plates 305 and is fixedly connected to the telescopic actuator 200. Its main function is to engage the bottom boss of the strip-shaped housing when the distance P between the bottom end of the strip-shaped housing and the rear flange of the chain is less than the lower tolerance limit, i.e., when the distance between the bottom end of the strip-shaped housing and the rear flange of the chain is too small. Using the rectangular step of the gauge 300 on this side to press against the rear flange of the chain, the handle 800 is turned counterclockwise. The telescopic actuator 200 moves backward with the retaining ring 400, slightly pulling the strip-shaped housing backward out of the chain. When the bottom end of the strip-shaped housing is completely in contact with the fork-shaped base plate 305 on this side, it indicates that the distance between the bottom end of the strip-shaped housing and the rear flange of the chain is just at the lower tolerance limit. This step is a shell-pulling operation.

[0045] Step 3: The nose-shaped rectangular block 100 is positioned opposite the foremost retaining ring 400 of the telescopic actuator cylinder 200. Its main function is to engage the front flange of the chain when the distance between the bottom of the strip-shaped housing and the rear flange of the chain exceeds the upper tolerance limit. Using the fork-shaped base plate 305 of the gauge 300 on this side against the bottom of the strip-shaped housing, and rotating the handle 800 counterclockwise, the telescopic actuator cylinder 200 moves backward along with the nose-shaped rectangular block 100. The fork-shaped base plate 305 then pushes the strip-shaped housing forward, slightly pushing it back into the chain. When the rectangular step on this side completely abuts the rear flange of the chain, it indicates that the distance between the bottom of the strip-shaped housing and the rear flange of the chain is just at the upper tolerance limit. This step is a shell-pushing operation.

[0046] The key points of this invention are as follows:

[0047] (1) The central platform 500 serves as the middle installation point of the entire device. The central platform 500 is a square boss with an outer contour of side length L and an inner contour of a through pipe with a diameter of Q and a thickness of 0.5L. Generally, L is selected to be 1 to 2 cm and Q is slightly smaller than L.

[0048] (2) The core measuring component of the device is the gauge 300. Due to the height difference between the small rectangular ruler 301 and the large rectangular ruler 304, a rectangular ruler step is formed. The fork-shaped base plate 305 is designed with a fork-shaped structure. The upper tolerance limit line 302 is located at the front end of the lower tolerance limit line 303, and the two are parallel. It is required that the two are kept at a height parallel to the fork-shaped base plate 305 to ensure measurement accuracy.

[0049] (3) The through holes of the telescopic actuator cylinder 200, telescopic actuator rod 700, center platform 500, conical sleeve 600, and handle 800 are strictly coaxial, and this axis is the main axis of the device. The upper tolerance limit line 302, the lower tolerance limit line 303, the retaining ring 400, and the fork-shaped base plate 305 are strictly perpendicular to the main axis of the device. The small rectangular ruler 301 and the large rectangular ruler 304 are strictly perpendicular to the fork-shaped base plate 305.

[0050] (4) Anti-slip texture is provided on the surface of handle 800 to prevent slipping.

[0051] The above description merely illustrates embodiments of the present invention and is quite specific and detailed; however, it should not be construed as limiting the scope of the patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Furthermore, any parts of the present invention not described in detail are conventional techniques.

Claims

1. A device for precise detection and calibration of the relative position of a chain and shell assembly, characterized in that, include: Nose head rectangular block (100), telescopic actuator cylinder (200), gauge (300), retaining ring (400), center platform (500), conical sleeve (600), telescopic actuator rod (700), handle (800); The gauge (300) is fixed at both ends of the center platform (500); The conical sleeve (600) is fixedly connected to the central platform (500) and is coaxial with the through hole of the central platform (500) and has the same diameter; the telescopic actuator cylinder (200) is a hollow cylindrical structure and is connected to the front end of the telescopic actuator rod (700); the rear end of the telescopic actuator rod (700) is connected to the handle (800), and the middle boss of the telescopic actuator rod (700) extends into the groove of the conical sleeve (600). The telescopic actuator rod (700) can only rotate around its axis and cannot slide. The retaining ring (400) is located on the gauge (300) at the lower end and is fixedly connected to the telescopic actuator (200); When the handle (800) is turned counterclockwise, the telescopic actuator (700) screws into the telescopic actuator cylinder (200), the telescopic actuator (700) is limited by the conical sleeve (600), the telescopic actuator cylinder (200) moves backward, and the distance between the nose rectangular block (100) and the rectangular step decreases; when the handle (800) is turned clockwise, the telescopic actuator (700) screws out of the telescopic actuator cylinder (200), the telescopic actuator (700) is limited by the conical sleeve (600), the telescopic actuator cylinder (200) moves forward, and the distance between the nose rectangular block (100) and the rectangular step increases; The nose-shaped rectangular block (100) is located on the opposite side of the foremost retaining ring (400) of the telescopic actuator (200); The gauge (300) consists of a small rectangular ruler (301), an upper tolerance limit line (302), a lower tolerance limit line (303), a large rectangular ruler (304), and a fork-shaped base plate (305). The large rectangular ruler (304) is vertically installed on the fork-shaped base plate (305), and the top of the large rectangular ruler (304) is flush with the top of the fork-shaped base plate (305); the small rectangular ruler (301) is an extension of the large rectangular ruler (304), with the lower tolerance limit line (303) as the boundary, and the small rectangular ruler (301) and the large rectangular ruler (304) form a rectangular ruler step due to the height difference; the fork-shaped base plate (305) is designed with a fork-shaped structure; the upper tolerance limit line (302) is located at the front end of the lower tolerance limit line (303), the two are parallel, and the two are parallel to the fork-shaped base plate (305).

2. The apparatus according to claim 1, characterized in that, The upper tolerance limit line (302), the lower tolerance limit line (303), the retaining ring (400), and the fork-shaped base plate (305) are perpendicular to the main axis of the device.

3. The apparatus according to claim 1, characterized in that, The central platform (500) serves as the central mounting point of the entire device. It is a square boss with an outer contour of side length L and an inner contour of a through pipe with a diameter of Q and a thickness of 0.5L. L is 1 to 2 centimeters and Q is less than L.

4. The apparatus according to claim 1, characterized in that, The telescopic actuator cylinder (200), telescopic actuator rod (700), through hole of center platform (500), tapered sleeve (600), and handle (800) are coaxial, and this axis is the main axis of the device.

5. The apparatus according to claim 1, characterized in that, The handle (800) surface is provided with anti-slip texture.

6. The apparatus according to claim 1, characterized in that, The retaining ring (400) is located at the front end of the fork-shaped base plate (305) at the lower end.

7. A method for precise detection and calibration of the relative position of a chain and shell assembly, characterized in that, For use in any one of claims 1 to 6, the method comprises the following steps: Step 1: When using the device, use the non-clamping ring (400) side to detect the relative position of the chain shell. Measure the distance between the bottom of the strip shell and the rear flange of the chain to see if it is greater than the lower tolerance limit and less than the upper tolerance limit. First, fully attach the fork-shaped base plate (305) to the bottom of the strip shell. Keep the main axis of the device parallel to the axis of the strip shell. Determine whether the rear edge of the rear flange of the chain is between the upper tolerance limit line (302) and the lower tolerance limit line (303). If so, the relative position of the chain shell is qualified. If the rear edge of the rear flange of the chain is before the upper tolerance limit line (302), the relative position of the chain shell is too large and a push shell operation is required. Proceed to Step 3. If the rear flange of the chain interferes with the large rectangular ruler (304), or the fork-shaped base plate (305) cannot attach to the bottom of the strip shell when the rectangular ruler step abuts against the rear flange of the chain, the relative position of the chain shell is too small and a pull shell operation is required. Proceed to Step 2. Step 2: Using the rectangular step of the side gauge (300), press it against the rear flange of the chain. Turn the handle (800) counterclockwise. The telescopic actuator (200) moves backward with the retaining ring (400). Pull the strip shell slightly backward out of the chain. When the bottom end of the strip shell is completely in contact with the side fork-shaped base plate (305), make sure that the distance between the bottom end of the strip shell and the rear flange of the chain is just at the lower limit of the tolerance. Step 3: Using the fork-shaped base plate (305) of the gauge (300) to adhere to the bottom end of the strip housing, turn the handle (800) counterclockwise. The telescopic actuator (200) moves backward with the nose rectangular block (100). The fork-shaped base plate (305) pushes the strip housing forward, slightly pushing the strip housing backward into the chain. When the rectangular step on this side completely abuts against the rear flange of the chain, determine that the distance between the bottom end of the strip housing and the rear flange of the chain is just at the upper limit of the tolerance.

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