Mirror polishing equipment for enamel glass tank

Abstract

The utility model relates to the field of enamel glass, in particular to enamel glass tank mirror polishing equipment which comprises a cross-shaped truss mechanical arm and roller carriers arranged symmetrically, the extending end of the cross-shaped truss mechanical arm is connected with a polishing device with an angle adjusting function, and the polishing device comprises an installation base. An adjusting plate mechanism is rotationally connected to the mounting seat, a hinging mechanism and a polishing mechanism are sequentially arranged at the top of the adjusting plate mechanism from bottom to top, a connecting rod is connected to one side of the top of the adjusting plate mechanism, and an L-shaped rod is connected to one side of the top of the polishing mechanism. By integrating the driving wheel, the driven wheel, the grinding belt and the driving motor, efficient and accurate polishing of the inner wall of the tank body is achieved, and when the tank bodies of different sizes are polished, the telescopic cylinder stretches out and draws back, so that the L-shaped rod drives the mounting plate to swing in cooperation with the hinge mechanism, the polishing angle is adjusted, and the polishing effect is improved. Therefore, the polishing machine is suitable for polishing the tank bodies with different shapes and sizes.

Description

Technical Field

[0001] This utility model relates to the field of enamel glass, and in particular to a mirror polishing device for enamel glass tanks. Background Technology

[0002] Enameled glass tanks, often simply referred to as glass-lined tanks, are functional containers formed by coating a metal substrate (such as steel plate) with a vitreous enamel and firing it at high temperatures. These tanks are resistant to strong acids, alkalis, high temperatures, and wear. Combining the mechanical strength of metal with the chemical stability of glass, they possess excellent corrosion resistance and high-temperature resistance. Because glass-lined tanks are widely used in the food, cosmetics, pharmaceutical, and chemical industries for storing or reacting various powders, granules, and liquids, their inner walls require polishing after production to improve surface smoothness and cleanliness. Polished inner walls are easier to clean, less prone to retaining dirt or reactants, thus ensuring product quality and hygienic production. Therefore, when used in specialized industries, they reduce the adhesion and accumulation of materials within the tank, facilitating material flow and mixing, and improving production efficiency.

[0003] Regarding the aforementioned technologies, the inventors discovered that traditional polishing methods have some limitations. Typically, finished enamel-lined jars are placed on roller frames, and then polishing wheels, in conjunction with a cross-shaped robotic arm, directly contact the inner wall of the jar for polishing. However, due to the varying sizes and inner diameters of enamel-lined jars, simply adjusting the distance between roller frames to ensure contact between the inner wall and the polishing wheel is not flexible enough. Furthermore, traditional polishing equipment often cannot change the direction of the polishing wheel or grinding belt, only performing polishing along the axial or radial direction of the jar. This necessitates setting up multiple polishing machines to meet the polishing needs of jars with different diameters. In addition, traditional polishing equipment is inadequate in adjusting the angle of the polishing wheel or grinding belt, a limitation that is particularly pronounced when polishing enamel-lined jars of different sizes, thus affecting polishing efficiency. Utility Model Content

[0004] The main technical problem solved by this utility model is to provide a mirror polishing device for enamel glass tanks, which makes it easy to change the polishing angle of the polishing belt and adjust the polishing direction of the polishing device. It is suitable for polishing tanks of different sizes and improves polishing efficiency.

[0005] To solve the above-mentioned technical problems, the present invention provides a mirror polishing device for enamel glass tanks, comprising: a cross-truss manipulator and symmetrically arranged roller frames. The extended end of the cross-truss manipulator is connected to a polishing device with an angle adjustment function. The polishing device includes a mounting base, on which an adjustment plate mechanism is rotatably connected. The top of the adjustment plate mechanism is provided with a hinge mechanism and a polishing mechanism from bottom to top. A connecting rod is connected to one side of the top of the adjustment plate mechanism, and an L-shaped rod is connected to one side of the top of the polishing mechanism.

[0006] It also includes a telescopic rod assembly that is hinged to the L-shaped rod to drive the polishing mechanism to swing, one end of the telescopic rod assembly being hinged to one end of the L-shaped rod;

[0007] A tension spring is installed on the opposite side of the L-shaped rod and the connecting rod.

[0008] By adopting the above technical solution, the cross-shaped truss manipulator, serving as the main support and moving mechanism of the polishing device, can precisely position and move the polishing device to a designated location within the enamel glass jar. The roller frame supports and rotates the enamel glass jar, ensuring its smooth rotation during polishing and facilitating uniform polishing of the inner wall. The two work together to achieve efficient, precise, and uniform polishing of the inner wall of the enamel glass jar. Furthermore, the polishing device, through a combination of mounting base, adjusting plate mechanism, hinge mechanism, and polishing mechanism, enables polishing operations at different angles on the inner wall of the jar, improving the adaptability and flexibility of the polishing operation. This allows for precise polishing of enamel glass jars of different diameters and shapes. Simultaneously, the rotating connection between the mounting base and the adjusting plate mechanism allows the adjusting plate mechanism to rotate freely on the mounting base, thereby adjusting the angle of the polishing mechanism. This enables the polishing device to be adjusted according to the specific shape and angle of the inner wall of the tank, ensuring the consistency and uniformity of the polishing effect. In addition, the telescopic rod assembly, in conjunction with the hinge mechanism, drives the polishing mechanism to swing on the L-shaped rod, thereby changing the contact angle between the polishing mechanism and the inner wall of the tank. This allows the polishing mechanism to swing within a certain range to adapt to different curvatures of the inner wall of the tank. Meanwhile, the tension spring provides a certain tension to maintain the stable position of the polishing mechanism during the polishing process, making the polishing device more stable and reliable during the polishing process and avoiding uneven polishing caused by vibration or shaking.

[0009] In a preferred embodiment, the present invention can be further configured as follows: the polishing mechanism includes a driving wheel, a driven wheel, a grinding belt, a mounting plate, and a drive motor connected to the mounting plate to drive the driving wheel to rotate. The driving wheel and the driven wheel are rotatably connected through the grinding belt. An L-shaped reinforcing rib is connected to the side of the mounting plate near the driven wheel. An electric push rod is connected to the L-shaped reinforcing rib. A U-shaped seat is connected to the extended end of the electric push rod. The driven wheel is rotatably connected to the U-shaped seat. A dust-collecting component is installed on the U-shaped seat, and the dust-collecting component covers the upper surface of the driven wheel.

[0010] By adopting the above technical solution, the drive motor drives the active wheel to rotate, which in turn drives the driven wheel to rotate in conjunction with the polishing belt, performing a uniform and efficient polishing operation on the inner wall of the enamel glass tank. The L-shaped reinforcing rib strengthens the structural strength of the polishing mechanism, preventing deformation or damage caused by long-term operation. Furthermore, the electric push rod adjusts the contact pressure and angle between the driven wheel and the polishing belt connected to it and the inner wall of the enamel glass tank through the extension and retraction of its extended end, achieving a tensioning effect. At the same time, the dust collection component covers the upper surface of the driven wheel to collect dust and debris generated during the polishing process, keeping the working environment clean, effectively reducing dust pollution during the polishing process, protecting the health of operators, and also helping to improve polishing quality and efficiency.

[0011] In a preferred embodiment, the present invention can be further configured as follows: the vacuum cleaner includes a fan-shaped vacuum housing with a hollow cavity, a vacuum hole is provided on the inner side of the fan-shaped vacuum housing, a connecting pipe is connected to the outer side of the fan-shaped vacuum housing, the connecting pipe is connected to the inner cavity of the fan-shaped vacuum housing, and the connecting pipe is connected to an external vacuum cleaner through a hose.

[0012] By adopting the above technical solution, the fan-shaped dust collection housing has a hollow cavity that fits onto the upper surface of the driven wheel. It is connected to a hose through a connecting port and to an external vacuum cleaner to form a complete dust collection system. The external vacuum cleaner provides strong suction, which draws in the dust from the driven wheel during polishing through the dust collection port, allowing the hose to collect it to the outside. This effectively reduces dust pollution during the polishing process and minimizes dust interference, thereby improving polishing quality and efficiency.

[0013] In a preferred embodiment, the present invention can be further configured as follows: the adjusting plate mechanism includes a rotating circular plate, the bottom of the mounting base has an arc-shaped movable opening, the center of the arc-shaped movable opening coincides with the center of the rotating circular plate, a screw is inserted through the top of the rotating circular plate, the bottom end of the screw passes through the arc-shaped movable opening and is located below it, a wing nut is threaded to the bottom end of the screw, and when the screw moves from one end of the arc-shaped movable opening to the other end, the rotating circular plate rotates ninety degrees.

[0014] By adopting the above technical solution, the rotating disc is allowed to rotate on the mounting base, thereby driving the polishing mechanism to adjust the angle. The arc-shaped movable opening provides a certain range of rotation for the rotating disc, and locks it with a wing nut after rotating 90 degrees. This allows the polishing mechanism to be applicable to enamel glass tanks of different shapes and sizes, improving the flexibility and adaptability of polishing operations.

[0015] In a preferred embodiment, the present invention can be further configured as follows: the hinge mechanism includes a first connecting block symmetrically arranged on the top of the rotating circular plate, and a second connecting block symmetrically installed on the bottom of the polishing mechanism. The first connecting block and the second connecting block are connected by a pin, and the opposite side of the first connecting block is in rotational contact with the opposite side of the second connecting block.

[0016] By adopting the above technical solution, connecting block one is used to connect with connecting block two of the polishing mechanism. The design of connecting block one ensures a stable connection and flexible rotation between the rotating disc and the polishing mechanism. Furthermore, the opposite side of connecting block one rotates and contacts the opposite side of connecting block two, ensuring the stability and smoothness of the polishing mechanism during its oscillation process. This avoids uneven polishing caused by shaking or jamming, and also allows the polishing mechanism to flexibly adapt to enamel glass tanks of different shapes and sizes, improving the flexibility and adaptability of the polishing operation.

[0017] In a preferred embodiment, the present invention can be further configured such that: the telescopic rod assembly includes a telescopic cylinder, the extended end of the telescopic cylinder is connected to a U-shaped block, and the U-shaped block is connected to an L-shaped rod via a pin.

[0018] By adopting the above technical solution, the telescopic cylinder drives the U-shaped block to move, and the L-shaped rod swings or rotates relative to the U-shaped block within a certain range through the pin shaft, and adjusts the position and height of the L-shaped rod and its connected polishing mechanism or other components, so that the polishing mechanism can adapt to enamel glass tanks of different shapes and sizes, and improve the uniformity and efficiency of polishing.

[0019] In summary, the present invention includes at least one of the following beneficial technical effects of the enamel glass tank mirror polishing equipment:

[0020] 1. By integrating the driving wheel, driven wheel, polishing belt and drive motor, efficient and precise polishing of the inner wall of the tank is achieved. When polishing tanks of different sizes, the telescopic cylinder extends and retracts, causing the L-shaped rod to drive the mounting plate and the hinge mechanism to swing, thereby adjusting the polishing angle and adapting to the polishing process of tanks of different shapes and sizes.

[0021] 2. When the polishing mechanism performs mirror polishing on the inner wall of the tank, the fan-shaped dust collection housing is attached to the upper surface of the driven wheel. It is connected to the hose through the connecting pipe port and to the external vacuum cleaner to form a complete dust collection system. The external vacuum cleaner provides strong suction, which draws in the dust from the driven wheel during polishing through the dust collection port, and collects it to the outside through the hose. This effectively reduces dust pollution during the polishing process, while also improving the environmental quality of the polishing operation and improving the polishing quality and efficiency.

[0022] 3. By rotating the screw and wing nut, the operator can adjust the angle of the rotating disc and the polishing mechanism to achieve precise control of the polishing position. This allows the polishing mechanism to polish along the axial or radial direction of the tank. At the same time, the 90-degree rotation function makes the polishing mechanism suitable for enamel glass tanks of different shapes and sizes, improving the flexibility and adaptability of the polishing operation. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0024] Figure 1 This is a schematic diagram of the structure of this utility model;

[0025] Figure 2 This is a schematic diagram of the polishing device of this utility model;

[0026] Figure 3 This is a schematic diagram of the polishing mechanism of this utility model;

[0027] Figure 4 This is a schematic diagram of the structure of the dust collection component of this utility model;

[0028] Figure 5 This is a schematic diagram of the adjusting plate mechanism of this utility model.

[0029] In the diagram: 1. Cross-shaped truss robot; 2. Roller frame; 30. Polishing device;

[0030] 31. Mounting base; 32. Adjustment plate mechanism; 33. Hinge mechanism; 34. Polishing mechanism; 35. Connecting rod; 36. L-shaped rod; 37. Telescopic rod assembly; 38. Tension spring;

[0031] 321. Rotating circular plate; 322. Arc-shaped movable opening; 323. Screw; 324. Wing nut;

[0032] 331. Connecting block one; 332. Connecting block two;

[0033] 341. Drive wheel; 342. Driven wheel; 343. Grinding belt; 344. Mounting plate; 345. Drive motor; 346. L-shaped reinforcing rib; 347. Electric push rod; 348. U-shaped base; 349. Vacuum cleaning component;

[0034] 371. Telescopic cylinder; 372. U-shaped block;

[0035] 3491. Fan-shaped vacuum housing; 3492. Vacuum hole; 3493. Connecting pipe port. Detailed Implementation

[0036] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0037] It should be noted that these figures are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0038] Reference Figure 1-5This utility model discloses a mirror polishing device for enamel glass tanks, comprising: a cross-shaped truss manipulator 1 and symmetrically arranged roller frames 2. The extended end of the cross-shaped truss manipulator 1 is connected to a polishing device 30 with an angle adjustment function. The polishing device 30 includes a mounting base 31, on which an adjusting plate mechanism 32 is rotatably connected. The top of the adjusting plate mechanism 32 is provided with a hinge mechanism 33 and a polishing mechanism 34 from bottom to top. A connecting rod 35 is connected to one side of the top of the adjusting plate mechanism 32. An L-shaped rod 36 is connected to the top side of the polishing mechanism 34, and a telescopic rod assembly 37, hinged to the L-shaped rod 36, drives the polishing mechanism 34 to swing. One end of the telescopic rod assembly 37 is hinged to one end of the L-shaped rod 36. The telescopic rod assembly 37 includes a telescopic cylinder 371, and a U-shaped block 372 is connected to the extended end of the telescopic cylinder 371. The U-shaped block 372 is connected to the L-shaped rod 36 via a pin. A tension spring 38 is installed on the opposite side of the L-shaped rod 36 and the connecting rod 35. The roller frame 2 is used to support and rotate the enamel glass jar, ensuring... During the polishing process, the tank rotates smoothly and, in conjunction with the cross-shaped truss manipulator 1, precisely positions and moves the polishing device 30 to the designated position inside the enamel glass tank. Then, the L-shaped rod 36 is driven by the telescopic cylinder 371 to move, causing the adjusting plate mechanism 32 and the hinge mechanism 33 to cooperate and drive the polishing mechanism 34 to adjust its angle. This ensures that the polishing mechanism 34 is adjusted according to the specific shape and angle of the inner wall of the tank, guaranteeing the consistency and uniformity of the polishing effect. In addition, the roller frame 2 can be a 300T roller frame produced by Wuxi Lanting Machinery Equipment Co., Ltd. or other types of roller frames 2. The telescopic cylinder 371 can be an electric cylinder, hydraulic cylinder, or pneumatic cylinder. After the telescopic cylinder 371 is de-energized, de-pneumatically, or de-oiled, the polishing mechanism 34 is in an inclined state, and its center direction is also offset. The tension spring 38 can use its own tension to make the polishing mechanism 34 contact the inner wall of the tank, making the polishing device 30 more stable and reliable during the polishing process, and avoiding uneven polishing caused by vibration or shaking.

[0039] The polishing mechanism 34 includes a drive wheel 341, a driven wheel 342, a polishing belt 343, a mounting plate 344, and a drive motor 345 connected to the mounting plate 344 to drive the drive wheel 341 to rotate. The drive wheel 341 and the driven wheel 342 are rotatably connected via the polishing belt 343. An L-shaped reinforcing rib 346 is connected to the side of the mounting plate 344 near the driven wheel 342. An electric push rod 347 is connected to the L-shaped reinforcing rib 346. The extended end of the electric push rod 347 is connected to a U-shaped seat 348. The driven wheel 342 is rotatably connected to the U-shaped seat 348. A dust-collecting component 349 is mounted on the U-shaped seat 348, and the dust-collecting component 349 covers the upper surface of the driven wheel 342. The drive motor 345 is preferably a servo motor. The polishing mechanism 34... The cooperation between the driving wheel 341 and the driven wheel 342, along with the movement of the polishing belt 343, enables precise polishing of the workpiece surface. Simultaneously, the precise control of the drive motor 345 allows for adjustment of parameters such as rotation speed and pressure during the polishing process, ensuring the stability and consistency of the polishing effect. Furthermore, the extension and retraction of the electric push rod 347 allows for adjustment of the tension of the polishing belt 343, ensuring the stability and efficiency of the polishing process. Additionally, the dust collection component 349, covering the upper surface of the driven wheel 342, collects dust and debris generated during polishing, effectively reducing air pollution at the polishing site, protecting the health of operators, and improving the cleanliness and efficiency of the polishing process.

[0040] The vacuuming component 349 includes a fan-shaped vacuuming housing 3491 with a hollow cavity. A vacuuming hole 3492 is provided on the inner side of the fan-shaped vacuuming housing 3491, and a connecting pipe 3493 is connected to the outer side of the fan-shaped vacuuming housing 3491. The connecting pipe 3493 communicates with the inner cavity of the fan-shaped vacuuming housing 3491 and is connected to an external vacuum cleaner via a flexible hose. The fan-shaped vacuuming housing 3491 conforms to the shape of the upper surface of the driven wheel 342, ensuring a wide and effective vacuuming range. The hollow cavity provides sufficient space for vacuuming, allowing dust and debris to be effectively collected. A complete vacuuming system is formed by the connecting pipe 3493, the flexible hose, and the vacuum cleaner. The vacuum cleaner provides suction, causing the vacuuming hole 3492 to suck in the dust generated during polishing of the driven wheel 342, reducing dust pollution during the polishing process and improving the environmental quality of the polishing operation, as well as the polishing quality and efficiency.

[0041] The adjusting plate mechanism 32 includes a rotating circular plate 321. An arc-shaped movable opening 322 is provided at the bottom of the mounting base 31. The center of the arc-shaped movable opening 322 coincides with the center of the rotating circular plate 321. A screw 323 passes through the top of the rotating circular plate 321, and the bottom end of the screw 323 passes through and is located below the arc-shaped movable opening 322. A wing nut 324 is threaded onto the bottom end of the screw 323. When the screw 323 moves from one end of the arc-shaped movable opening 322 to the other end, the rotating circular plate 321 rotates 90 degrees. The hinge mechanism 33 includes a connecting block 331 symmetrically arranged on the top of the rotating circular plate 321, and a second connecting block 331 symmetrically installed at the bottom of the polishing mechanism 34. 332, connecting block one 331 and connecting block two 332 are connected by a pin, and the opposite side of connecting block one 331 is in rotatable contact with the opposite side of connecting block two 332; the arc-shaped movable opening 322 provides space for the rotation of the rotating disc 321. By rotating the wing nut 324, the position of the screw 323 within the arc-shaped movable opening 322 is adjusted, thereby controlling the rotation angle of the rotating disc 321 and driving the connected polishing mechanism 34 to make corresponding angle changes. The hinge mechanism 33 allows the polishing mechanism 34 to make additional swing adjustments while the rotating disc 321 is rotating to adapt to workpiece surfaces of different shapes and curvatures. This flexibility improves the adaptability and efficiency of the polishing process.

[0042] The implementation principle of this embodiment is as follows: In use, an overhead crane or other equipment is used to lift the enamel glass tank onto the roller frame 2. Then, the cross truss robot arm 1 is used to precisely position the polishing device 30 and move it to the designated position inside the enamel glass tank. Subsequently, the telescopic cylinder 371 drives the L-shaped rod 36 to move, so that the mounting plate 344, in conjunction with the hinge mechanism 33, drives the polishing mechanism 34 to adjust according to the specific shape and angle of the inner wall of the tank, ensuring the consistency and uniformity of the polishing effect. Then, the drive motor 345 drives the drive wheel 341 to rotate and synchronously drives the grinding belt 343 to move and the driven wheel 342 to rotate, performing grinding and polishing operations on the inner wall of the enamel glass tank.

[0043] The above are merely embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A mirror polishing device for enamel glass tanks, comprising: A cross-shaped truss manipulator (1) and symmetrically arranged roller frames (2) are characterized in that the extended end of the cross-shaped truss manipulator (1) is connected to a polishing device (30) with an angle adjustment function. The polishing device (30) includes a mounting base (31), an adjusting plate mechanism (32) is rotatably connected to the mounting base (31), and a hinge mechanism (33) and a polishing mechanism (34) are arranged sequentially from bottom to top on the top of the adjusting plate mechanism (32). A connecting rod (35) is connected to one side of the top of the adjusting plate mechanism (32), and an L-shaped rod (36) is connected to one side of the top of the polishing mechanism (34). It also includes a telescopic rod assembly (37) that is hinged to the L-shaped rod (36) to drive the polishing mechanism (34) to swing, one end of the telescopic rod assembly (37) being hinged to one end of the L-shaped rod (36); A tension spring (38) is installed on the opposite side of the L-shaped rod (36) and the connecting rod (35).

2. The mirror polishing equipment for enamel glass tanks according to claim 1, characterized in that, The polishing mechanism (34) includes a drive wheel (341), a driven wheel (342), a polishing belt (343), a mounting plate (344), and a drive motor (345) connected to the mounting plate (344) to drive the drive wheel (341) to rotate. The drive wheel (341) and the driven wheel (342) are rotatably connected by the polishing belt (343). An L-shaped reinforcing rib (346) is connected to the side of the mounting plate (344) near the driven wheel (342). An electric push rod (347) is connected to the L-shaped reinforcing rib (346). A U-shaped seat (348) is connected to the extended end of the electric push rod (347). The driven wheel (342) is rotatably connected to the U-shaped seat (348). A dust-collecting component (349) is installed on the U-shaped seat (348). The dust-collecting component (349) covers the upper surface of the driven wheel (342).

3. The mirror polishing equipment for enamel glass tanks according to claim 2, characterized in that, The vacuum cleaner (349) includes a fan-shaped vacuum housing (3491) with a hollow cavity. The inner side of the fan-shaped vacuum housing (3491) is provided with a vacuum hole (3492). The outer side of the fan-shaped vacuum housing (3491) is connected to a connecting pipe (3493). The connecting pipe (3493) is connected to the inner cavity of the fan-shaped vacuum housing (3491). The connecting pipe (3493) is connected to an external vacuum cleaner through a hose.

4. The mirror polishing equipment for enamel glass tanks according to claim 1, characterized in that, The adjusting plate mechanism (32) includes a rotating circular plate (321). The bottom of the mounting base (31) is provided with an arc-shaped movable opening (322). The center of the arc-shaped movable opening (322) coincides with the center of the rotating circular plate (321). A screw (323) is provided on the top of the rotating circular plate (321). The bottom end of the screw (323) passes through the arc-shaped movable opening (322) and is located below it. A wing nut (324) is threaded to the bottom end of the screw (323). When the screw (323) moves from one end of the arc-shaped movable opening (322) to the other end, the rotating circular plate (321) rotates ninety degrees.

5. A mirror finishing apparatus for a vitreous glass tank body according to claim 4, wherein The hinge mechanism (33) includes a first connecting block (331) symmetrically arranged on the top of the rotating circular plate (321), and a second connecting block (332) symmetrically installed on the bottom of the polishing mechanism (34). The first connecting block (331) and the second connecting block (332) are connected by a pin, and the opposite side of the first connecting block (331) is in rotational contact with the opposite side of the second connecting block (332).

6. The mirror polishing equipment for enamel glass tanks according to claim 1, characterized in that, The telescopic rod assembly (37) includes a telescopic cylinder (371), and a U-shaped block (372) is connected to the extended end of the telescopic cylinder (371). The U-shaped block (372) is connected to the L-shaped rod (36) by a pin.

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