A raw material grinding device for leather auxiliary production

Abstract

The utility model provides a raw material grinding device for leather auxiliary production relates to leather auxiliary production technical field, the utility model discloses the bottom frame, the utility model discloses can according to actual use demand, first will adjust the net with the help of T shape sliding block in the T shape sliding slot on the filter screen and the sliding hole to one end slide to certain position, make the hole on two net surfaces dislocation form the hole of new size, then with the help of limiting mechanism fixes, fixes and locks dead after adjusting the adjusting net, in this way to the leather auxiliary raw material in the grinding process carries out the filtration treatment, realizes the screening to different particle size raw material, improves the applicability of equipment, satisfies the diversified production demand, and again cooperate the anti -blocking mechanism and knock the vibration of the bottom of adjusting net, to avoid the blockage, improve the filtration efficiency. And can discharge the raw material that reaches the requirement in time, can reduce the possibility that raw material appears agglomeration and metamorphic, improve the quality stability of leather auxiliary raw material after grinding, improve the grinding efficiency.

Description

Technical Field

[0001] This utility model relates to the field of leather auxiliary agent production technology, and in particular to a raw material grinding device for leather auxiliary agent production. Background Technology

[0002] Grinding equipment is used to finely grind and disperse the raw materials required in the production of leather auxiliaries. Its main function is to physically grind the raw materials by mechanical means to achieve a certain particle size and uniformity, so as to ensure that it can effectively play its role in subsequent production processes.

[0003] When grinding and pulverizing leather auxiliary raw materials, the raw materials are fed into the grinding machine through the feed hopper, then the machine cover is closed and sealed. The drive motor on the base frame is started, which drives the sprocket to rotate. The chain then drives the grinding disc inside the grinding machine to rotate, creating a shearing and grinding effect with the blades on the cover. The ground and pulverized leather auxiliary raw materials are discharged from the discharge hole, completing the grinding and pulverization process. Because the structure of the discharge hole is fixed, the fineness of the raw materials during the grinding process depends entirely on the preset grinding time and the speed control of the cutter disc. When some raw materials reach the target fineness first, they cannot be separated and discharged from the grinding chamber in time, and will continue to be ground along with the raw materials that have not met the standard. This not only easily leads to problems such as agglomeration and deterioration of the overly fine raw materials, affecting the stability of product quality, but also causes energy waste and reduced grinding efficiency. At the same time, if the grinding fineness needs to be adjusted for different batches and types of leather auxiliary raw materials, the existing equipment requires the entire grinding component to be replaced or the equipment parameters to be readjusted. The operation is complicated and lacks flexibility, making it difficult to meet diverse production needs. Utility Model Content

[0004] The technical problem this invention aims to solve is that, due to the fixed structure of the discharge hole, the fineness of the raw material during grinding depends entirely on the preset grinding time and the rotation speed of the cutter disc. When some raw materials reach the target fineness first, they cannot be separated and discharged from the grinding chamber in time, and will continue to be ground along with the substandard raw materials. This not only easily leads to problems such as agglomeration and deterioration of overly fine raw materials, affecting the stability of product quality, but also causes energy waste and reduced grinding efficiency. At the same time, for different batches and types of leather auxiliary raw materials, if the grinding fineness needs to be adjusted, the existing device requires the entire grinding component to be replaced or the equipment parameters to be readjusted, which is complicated to operate and lacks flexibility, making it difficult to meet diverse production needs.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a raw material grinding device for leather auxiliary production, including a base frame, a grinding machine is arranged on one side of the base frame, a feed hopper is installed through one side of the cover of the grinding machine, a discharge hole is opened on one side of the grinding chamber of the grinding machine, and a filter device is arranged on the inner wall of the discharge hole. The filter device can install the filter screen in the inner wall of the discharge hole near the grinding chamber, and adjust the adjusting screen to a certain position according to the actual use requirements, so that the holes on the two screen surfaces are misaligned to form holes of a new size to filter the leather auxiliary raw materials during the grinding process.

[0006] Preferably, the filtering device includes a filter screen, wherein the outer surface of the filter screen is fixedly installed in the inner wall of the discharge hole, a T-shaped groove is provided on one side of the filter screen, and a sliding hole is provided on one side of the inner wall of the discharge hole; an adjusting screen, wherein one end of the adjusting screen is slidably installed in the inner wall of the sliding hole, and the holes on the adjusting screen are the same size as the holes on the filter screen; a T-shaped slider, wherein one side of the T-shaped slider is fixedly installed on one side of the adjusting screen, and one end is slidably installed in the inner wall of the T-shaped groove; a limiting mechanism, wherein the limiting mechanism is provided on one side of the adjusting screen and one side of the grinding machine, for fixing and limiting the adjusted screen after adjustment; and an anti-clogging mechanism, wherein the anti-clogging mechanism is provided at the bottom of the adjusting screen, so that during the filtration process of the leather auxiliary material by the filter screen and the adjusting screen, the bottom of the adjusting screen is tapped and vibrated to prevent the ground material from clogging the filter holes.

[0007] The effect achieved by the above components is as follows: When it is necessary to grind and pulverize leather auxiliary raw materials, the adjusting screen can first be slid to a certain position in the T-shaped groove and sliding hole of the filter screen with the help of the T-shaped slider, so that the holes on the two screen surfaces are misaligned to form holes of a new size. Then, the adjusting screen is fixed and locked with the limiting mechanism, thereby filtering the leather auxiliary raw materials during the grinding process. In this way, it is possible to screen raw materials of different particle sizes according to different batches and types of leather auxiliary raw materials, improve the applicability of the equipment, and meet diversified production needs. At the same time, the anti-clogging mechanism taps and vibrates the bottom of the adjusting screen to avoid clogging and improve filtration efficiency.

[0008] Preferably, a sealing plate is fitted onto the outer surface of one end of the adjusting mesh, wherein the outer surface dimension of the sealing plate is larger than the inner wall dimension of the sliding hole, and one side abuts against one side of the grinding machine.

[0009] The effects achieved by the above components are as follows: the sealing plate can effectively seal the gap between the sliding hole and the adjusting mesh, preventing dust from overflowing from the gap during the grinding process. This avoids material waste, reduces dust pollution to the working environment, and also prevents external impurities from entering the grinder through the gap and contaminating the raw materials, thus ensuring the quality of raw material grinding.

[0010] Preferably, the limiting mechanism includes a rectangular hole frame, wherein one side of the rectangular hole frame is fixedly installed on one side of the grinding machine, and a plurality of locking holes are provided on one side of the adjusting net; a locking rod, wherein one end of the locking rod is slidably installed in the inner wall of the rectangular hole frame, and the other end is inserted into the inner wall of the locking hole; and a spring, wherein both ends of the spring are respectively fixedly installed on one side of the locking rod and one side of the rectangular hole frame.

[0011] The effect achieved by the above components is as follows: before adjusting the adjustment screen, pull the clamping rod down to a certain position on the rectangular hole frame, causing the spring to be stretched open. After adjustment, release the clamping rod so that it can be inserted into the corresponding hole on the filter screen under the reset action of the spring, and fix the adjusted adjustment screen on one side of the grinder.

[0012] Preferably, the limiting mechanism further includes a telescopic sleeve, wherein the inner wall of the telescopic sleeve is fitted onto the outer surface of the spring, and both ends are respectively fixedly installed on one side of the clamp rod and one side of the rectangular hole frame.

[0013] The above-mentioned components achieve the following effects: the telescopic sleeve can protect the spring, prevent dust generated during the grinding process from adhering to the spring surface, avoid the spring from rusting or jamming due to dust, extend the service life of the spring, and at the same time prevent the spring from shifting during the extension and retraction process, ensuring that the spring can always provide stable elastic force to the lever.

[0014] Preferably, the anti-clogging mechanism includes a round rod, one end of which is installed through and on one side of the inner wall of the discharge hole; two striking rods, one end of which is fixedly installed on the outer surface of the round rod; and a servo motor, one side of which is fixedly installed on one side of the grinder, and the output end is fixedly installed on one side of the round rod by means of a coupling.

[0015] The effect achieved by the above components is as follows: when the servo motor is working, it can drive the round rod to rotate stably, which in turn drives the striking rod to strike the bottom of the adjustment screen. The vibration causes the raw material particles blocked in the filter holes to fall off, effectively solving the problem of filter hole blockage, ensuring that the raw material can be discharged smoothly through the filter holes, and ensuring the continuity of grinding process.

[0016] Preferably, the anti-blocking mechanism further includes several reinforcing rods, wherein the two sides of the reinforcing rods are respectively fixedly installed on one side of the striking rod and the outer surface of the round rod.

[0017] The effects achieved by the above components are as follows: the reinforcing rod can enhance the connection strength between the striking rod and the round rod, prevent the striking rod from loosening or breaking during long-term striking and vibration, extend the service life of the striking rod, ensure that the anti-blocking mechanism can play a continuous and stable role, and avoid the failure of the anti-blocking function due to damage to the striking rod.

[0018] Preferably, a protective block is fixedly installed on the outer surface of one end of the striking rod, and the protective block is made of rubber.

[0019] The above-mentioned components achieve the following effects: when the striking rod strikes the bottom of the adjusting mesh, the protective block can act as a buffer, preventing the striking rod from directly colliding with the adjusting mesh and causing damage to the adjusting mesh or the striking rod, thus extending the service life of both. At the same time, it can also reduce the noise generated during the striking process and improve the working environment.

[0020] The beneficial effects of this utility model are:

[0021] By incorporating a filtration device, when grinding and pulverizing leather auxiliary raw materials is required, the adjusting screen can first be slid to a certain position in the T-shaped groove and through the sliding holes on the filter screen using a T-shaped slider, causing the holes on the two screen surfaces to misalign and form new holes of a new size. Then, a limiting mechanism is used to fix and lock the adjusted screen, thus filtering the leather auxiliary raw materials during the grinding process. This allows for the screening of raw materials of different particle sizes for different batches and types of leather auxiliary materials, improving the equipment's applicability and meeting diverse production needs. Simultaneously, an anti-clogging mechanism taps and vibrates the bottom of the adjusting screen to prevent clogging and improve filtration efficiency. Furthermore, the timely discharge of raw materials that meet the requirements reduces the possibility of agglomeration and deterioration, improves the quality stability of the ground leather auxiliary raw materials, avoids energy waste, and increases grinding efficiency. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model.

[0023] Figure 2 This is a three-dimensional structural diagram of the base frame of this utility model;

[0024] Figure 3 This is a three-dimensional structural diagram of the grinding machine part of this utility model;

[0025] Figure 4 This is a three-dimensional structural diagram of the filter screen of this utility model;

[0026] Figure 5 This is an exploded three-dimensional structural diagram of the regulating mesh of this utility model;

[0027] Figure 6This is a three-dimensional structural diagram of the round rod of this utility model;

[0028] Figure 7 for Figure 6 A three-dimensional structural diagram of a local part of the structure.

[0029] Legend: 1. Base frame; 2. Filter device; 3. Grinding machine; 4. Feed hopper; 5. Discharge hole; 21. Sliding hole; 22. Filter screen; 23. T-shaped slide groove; 24. Adjusting screen; 25. T-shaped slider; 26. Limiting mechanism; 261. Locking hole; 262. Rectangular hole frame; 263. Locking rod; 264. Spring; 265. Telescopic sleeve; 27. Anti-clogging mechanism; 271. Round rod; 272. Striking rod; 273. Servo motor; 274. Reinforcing rod; 275. Protective block; 28. Sealing plate. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0031] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0032] The implementation of this utility model will be described in detail below with reference to specific embodiments.

[0033] In this embodiment:

[0034] Figure 1-7 The apparatus shown is a raw material grinding device for producing leather auxiliaries. It includes a base frame 1, a grinding machine 3 is arranged on one side of the base frame 1, a feed hopper 4 is installed through one side of the cover of the grinding machine 3, and a discharge hole 5 is opened on one side of the grinding chamber of the grinding machine 3. A filter device 2 is arranged on the inner wall of the discharge hole 5. The filter device 2 can install a filter screen 22 in the inner wall of the discharge hole 5 near the grinding chamber. According to the actual use requirements, the adjusting screen 24 is slidably adjusted on the filter screen 22 to a certain position, so that the holes on the two screens are misaligned to form holes of a new size to filter the raw materials of leather auxiliaries during the grinding process.

[0035] Figure 1-7 The filter device 2 shown includes a filter screen 22, the outer surface of which is fixedly installed in the inner wall of the discharge hole 5. A T-shaped groove 23 is provided on one side of the filter screen 22, and a sliding hole 21 is provided on one side of the inner wall of the discharge hole 5. An adjusting screen 24 is provided, one end of which is slidably installed in the inner wall of the sliding hole 21, and the holes on the adjusting screen 24 are the same size as the holes on the filter screen 22. A T-shaped slider 25 is provided, one side of which is fixedly installed on one side of the adjusting screen 24, and the other end is slidably installed in the inner wall of the T-shaped groove 23. A limiting mechanism 26 is provided on one side of the adjusting screen 24 and one side of the grinding machine 3, and is used to fix and limit the adjusted adjusting screen 24. An anti-clogging mechanism 27 is provided at the bottom of the adjusting screen 24, and is used to tap and vibrate the bottom of the adjusting screen 24 during the filtration process of the filter screen 22 and the adjusting screen 24 on the ground leather auxiliary material, so that the ground material is not easy to clog the filter holes. When grinding and pulverizing leather auxiliary raw materials, the adjusting mesh 24 is first slid to one end in a certain position using the T-shaped slider 25 in the T-shaped groove 23 and sliding hole 21 on the filter mesh 22, causing the holes on the two mesh surfaces to misalign and form new holes of a new size. Then, it is fixed in place by the limiting mechanism 26, thus filtering the leather auxiliary raw materials during the grinding process. This allows for the screening of raw materials of different particle sizes according to different batches and types of leather auxiliary raw materials, improving the applicability of the equipment and meeting diverse production needs. At the same time, the anti-clogging mechanism 27 taps and vibrates the bottom of the adjusting mesh 24 to prevent clogging and improve filtration efficiency. A sealing plate 28 is fitted on the outer surface of one end of the adjusting mesh 24, wherein the outer surface size of the sealing plate 28 is larger than the inner wall size of the sliding hole 21, and one side abuts against one side of the grinding machine 3. The sealing plate 28 can effectively seal the gap between the sliding hole 21 and the adjusting mesh 24, preventing dust from overflowing from the gap during the grinding process. This avoids material waste and reduces dust pollution to the working environment. At the same time, it can also prevent external impurities from entering the grinder 3 through the gap and contaminating the raw materials, thus ensuring the grinding quality of the raw materials.

[0036] Figure 1-7The limiting mechanism 26 shown includes a rectangular frame 262, one side of which is fixedly mounted on one side of the grinder 3, and a plurality of locking holes 261 are provided on one side of the adjusting screen 24; a locking rod 263, one end of which is slidably mounted in the inner wall of the rectangular frame 262, and the other end is inserted into the inner wall of the locking hole 261; and a spring 264, both ends of which are fixedly mounted on one side of the locking rod 263 and one side of the rectangular frame 262, respectively. Before adjusting the adjusting screen 24, the locking rod 263 is pulled down on the rectangular frame 262 to a certain position, causing the spring 264 to be stretched open. After adjustment, the locking rod 263 is released, so that under the reset action of the spring 264, it can be locked into the corresponding locking hole 261 on the filter screen 22, thus fixing the adjusted adjusting screen 24 on one side of the grinder 3. The limiting mechanism 26 also includes a telescopic sleeve 265, the inner wall of which is fitted onto the outer surface of the spring 264, and both ends are fixedly installed on one side of the locking rod 263 and one side of the rectangular hole bracket 262, respectively. The telescopic sleeve 265 protects the spring 264, preventing dust generated during the grinding process from adhering to the surface of the spring 264, avoiding rust or jamming of the spring 264 due to dust, extending the service life of the spring 264, and preventing the spring 264 from shifting during the extension and retraction process, ensuring that the spring 264 can always provide stable elastic force to the locking rod 263.

[0037] Figure 1-7 The anti-clogging mechanism 27 shown includes a round rod 271, one end of which is installed through the inner wall of the discharge hole 5; two striking rods 272, one end of which is fixedly installed on the outer surface of the round rod 271; and a servo motor 273, one side of which is fixedly installed on one side of the grinder 3, and the output end is fixedly installed on one side of the round rod 271 via a coupling. When the servo motor 273 is working, it can drive the round rod 271 to rotate stably, which in turn drives the striking rods 272 to strike the bottom of the adjusting mesh 24. The vibration causes the raw material particles blocked in the filter holes to fall off, effectively solving the filter hole clogging problem, ensuring that the raw material can be discharged smoothly through the filter holes, and ensuring the continuity of the grinding process.

[0038] Figure 1-7The anti-blocking mechanism 27 also includes several reinforcing rods 274, with each reinforcing rod 274 fixedly mounted on one side of the striking rod 272 and the outer surface of the round rod 271. The reinforcing rods 274 enhance the connection strength between the striking rod 272 and the round rod 271, preventing the striking rod 272 from loosening or breaking during long-term striking vibration, extending its service life, ensuring the anti-blocking mechanism 27 functions stably and continuously, and preventing the anti-blocking function from failing due to damage to the striking rod 272. A protective block 275, made of rubber, is fixedly installed on the outer surface of one end of the striking rod 272. The protective block 275 acts as a buffer when the striking rod 272 strikes the bottom of the adjusting mesh 24, preventing direct hard collision between the striking rod 272 and the adjusting mesh 24, thus extending their service life and reducing noise during striking, improving the working environment.

[0039] Working principle: When grinding and pulverizing leather auxiliary materials, firstly, according to actual needs, pull the lever 263 down on the rectangular hole frame 262 to a certain position, causing the spring 264 to be stretched open. Then, the adjusting mesh 24, with the help of the T-shaped slider 25, slides to one end of the T-shaped groove 23 and sliding hole 21 on the filter mesh 22 to a certain position, causing the holes on the two mesh surfaces to be misaligned to form holes of a new size. This filters the leather auxiliary materials during the grinding process, thus allowing for different batches to be processed. This allows for the screening of different types of leather auxiliary raw materials, enabling the selection of raw materials with varying particle sizes, improving the equipment's applicability, and meeting diverse production needs. When the locking lever 263 is released, it can be locked into the corresponding locking hole 261 on the filter screen 22 under the reset action of the spring 264. The adjusted adjusting screen 24 is then fixed to one side of the grinding machine 3. During grinding, the leather auxiliary raw materials can be fed into the grinding machine 3 from the feed hopper 4 on one side of the machine cover. The machine cover is then closed and sealed, and the drive motor on the base frame 1 is started. The rotating sprocket drives the grinding disc inside the grinder 3 via a chain, causing it to shear and grind against the blades on the cover. This grinds and pulverizes the leather auxiliary material placed inside the grinder 3. The finer particles pass through the holes formed between the filter screen 22 and the regulating screen 24, while larger particles remain in the grinding chamber of the grinder 3 for further grinding. The particles that have passed through are discharged from the discharge hole 5, completing the grinding and pulverizing process. By promptly discharging the qualified material, the possibility of agglomeration and deterioration can be reduced, improving the quality stability of the ground leather auxiliary material, avoiding energy waste, and increasing grinding efficiency. During the filtration process of the ground leather auxiliary material by the filter screen 22 and the regulating screen 24, the servo motor 273 can be activated to drive the round rod 271 to rotate back and forth, thereby driving the striking rod 272 to regularly tap and vibrate the bottom of the regulating screen 24. This prevents the ground material from clogging the filter holes, improving filtration efficiency and reducing the number of cleaning cycles.

[0040] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A raw material grinding apparatus for producing leather auxiliaries, comprising a base frame (1), characterized in that: A grinding machine (3) is provided on one side of the base frame (1). A feed hopper (4) is installed through one side of the cover of the grinding machine (3). A discharge hole (5) is provided on one side of the grinding chamber of the grinding machine (3). A filter device (2) is provided on the inner wall of the discharge hole (5). The filter device (2) can install the filter screen (22) in the inner wall of the discharge hole (5) near the grinding chamber. According to the actual use requirements, the adjustment screen (24) is slid and adjusted on the filter screen (22) to a certain position, so that the holes on the two screens are misaligned to form holes of a new size to filter the leather auxiliary raw materials in the grinding process.

2. The raw material grinding device for leather auxiliary agent production according to claim 1, characterized in that: The filter device (2) includes a filter screen (22), wherein the outer surface of the filter screen (22) is fixedly installed in the inner wall of the discharge hole (5), a T-shaped groove (23) is provided on one side of the filter screen (22), and a sliding hole (21) is provided on one side of the inner wall of the discharge hole (5). Adjustment mesh (24), wherein one end of adjustment mesh (24) is slidably installed in the inner wall of sliding hole (21), wherein the holes on adjustment mesh (24) are the same size as the holes on filter mesh (22); T-shaped slider (25), wherein one side of the T-shaped slider (25) is fixedly installed on one side of the adjusting net (24), and one end is slidably installed in the inner wall of the T-shaped groove (23); Limiting mechanism (26), wherein the limiting mechanism (26) is set on one side of the adjusting net (24) and one side of the grinding machine (3), and is used to fix and limit the adjusted adjusting net (24); Anti-clogging mechanism (27), wherein the anti-clogging mechanism (27) is set at the bottom of the regulating screen (24) so ​​that during the filtration process of the filter screen (22) and the regulating screen (24) for filtering the ground leather auxiliary raw materials, it is used to knock and vibrate the bottom of the regulating screen (24) so ​​that the ground raw materials are not easy to clog the filter holes.

3. The raw material grinding device for leather auxiliary agent production according to claim 2, characterized in that: A sealing plate (28) is fitted onto the outer surface of one end of the regulating net (24), wherein the outer surface dimension of the sealing plate (28) is larger than the inner wall dimension of the sliding hole (21), and one side abuts against one side of the grinding machine (3).

4. The raw material grinding device for leather auxiliary agent production according to claim 2, characterized in that: The limiting mechanism (26) includes a rectangular hole frame (262), wherein one side of the rectangular hole frame (262) is fixedly installed on one side of the grinding machine (3), and a plurality of locking holes (261) are provided on one side of the adjusting net (24); A locking rod (263), wherein one end of the locking rod (263) is slidably installed in the inner wall of the rectangular hole frame (262), and the other end is inserted in the inner wall of the locking hole (261); A spring (264), wherein the two ends of the spring (264) are fixedly installed on one side of the lever (263) and one side of the rectangular hole bracket (262), respectively.

5. The raw material grinding device for leather auxiliary agent production according to claim 4, characterized in that: The limiting mechanism (26) also includes a telescopic sleeve (265), wherein the inner wall of the telescopic sleeve (265) is sleeved on the outer surface of the spring (264), and both ends are fixedly installed on one side of the clamp (263) and one side of the rectangular hole frame (262).

6. The raw material grinding device for producing leather auxiliaries according to claim 2, characterized in that: The anti-blocking mechanism (27) includes a round rod (271), one end of which is installed through the inner wall of the discharge hole (5); Two striking rods (272), one end of which is fixedly mounted on the outer surface of the round rod (271); A servo motor (273) is fixedly mounted on one side of the grinding machine (3), and its output end is fixedly mounted on one side of the round rod (271) by means of a coupling.

7. The raw material grinding device for producing leather auxiliaries according to claim 6, characterized in that: The anti-blocking mechanism (27) also includes several reinforcing rods (274), wherein the two sides of the reinforcing rods (274) are respectively fixedly installed on one side of the striking rod (272) and the outer surface of the round rod (271).

8. The raw material grinding apparatus for producing leather auxiliaries according to claim 6, characterized in that: A protective block (275) is fixedly installed on the outer surface of one end of the striking rod (272), and the protective block (275) is made of rubber.

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