Grinding sub-assembly convenient to replace and overhaul

Abstract

The grinding sub-assembly convenient to replace and overhaul comprises a grinding sub-assembly, a grinding sub-assembly support and an anti-disengaging assembly, the upper side of the grinding sub-assembly is provided with a back plate with a mounting groove, and an end plate in the middle of the front end or the middle of the rear end of the mounting groove divides a front end opening or a rear end opening of the mounting groove into two first insertion holes located in the left side and the right side; the grinding sub-support comprises a base plate, a first arm plate and a second arm plate which extend outwards are arranged at the front end or the rear end of the base plate, when the grinding sub-support and the grinding sub-support are assembled in place, the back plate is connected into the mounting groove in a penetrating mode, and the first arm plate and the second arm plate correspondingly penetrate out of the two first insertion holes and extend out of the mounting groove. The first arm plate is provided with a second insertion hole and a third insertion hole in the front-back direction, the anti-disengaging assembly comprises a stop block and an n-shaped insertion rod, the stop block is located in a gap between the first arm plate and the second arm plate and attached to the outer side face of the end plate, one end of the stop block is provided with a through hole, and the other end of the stop block is connected with the second arm plate in a pivoted mode through a quick-release pivoting assembly. The n-shaped inserting rod is provided with a first inserting arm rod and a second inserting arm rod, the length of the first inserting arm rod is larger than that of the second inserting arm rod, the first inserting arm rod is connected into the second inserting hole in a limiting and penetrating mode through an elastic limiting assembly which can stretch out and draw back in the front-back direction, and the second inserting arm rod is connected into the through hole of the check block and the third inserting hole in a penetrating mode. According to the grinding unit assembly, when the grinding unit is overhauled, only the n-shaped inserting rod needs to be dragged to enable the second inserting arm rod to be disengaged from the through hole of the check block, then the check block is turned over with the second arm plate as a fulcrum to enable the quick-disassembly type pivot joint assembly to be disengaged, and then the grinding unit can be quickly disassembled from the grinding unit support. And finally, a new grinding piece is inserted into the grinding piece support again, the grinding piece maintenance operation is completed, operation is easy, and the maintenance efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of train track tread cleaning equipment, in particular to a grinding subassembly which is convenient for replacement and maintenance. Background Art

[0002] At present, when the wheel tread of a rail transit vehicle is damaged, out of round, or has low viscosity, the wheel surface condition can be improved, slipping and idling can be prevented, and the wheel tread can be corrected through contact and friction with the grinding wheel of the tread cleaning device. The tread cleaning device of the prior art has a structure including a grinding wheel and a grinding wheel holder. After the grinding wheel and the grinding wheel holder are connected, they are locked by an anti-slip device. Among them, the grinding wheel is a vulnerable part and needs to be frequently loaded and unloaded for maintenance. For example, the old grinding wheel is removed from the tread cleaning device, and then the new grinding wheel is reinstalled on the tread cleaning device. However, most of the anti-slip devices in the existing tread cleaning devices are hook tongue plug pin-connected components, that is, the structure of the anti-slip device is relatively complex, and it is inconvenient to disassemble in the narrow use space scene where the tread cleaning device is located, resulting in a long time for the maintenance and replacement of the grinding wheel, which seriously restricts the maintenance efficiency of the tread cleaning device on the entire locomotive group. To this end, the utility model proposes a grinding wheel assembly that is easy to replace and repair, in order to improve the maintenance and replacement efficiency of the grinding wheel on the tread cleaning device. Summary of the invention

[0003] The purpose of the utility model is to overcome the defects in the prior art and provide a grinding sub-assembly which is easy to replace and overhaul. When overhauling and replacing the grinding sub-assembly, the operator only needs to hold the N-shaped insertion rod and apply force to the side away from the grinding sub-holder to make the second insertion arm rod disengage from the through hole of the block, and then flip the block along the arm plate 2 as the fulcrum to make the quick-release pivot assembly between the block and the second insertion arm rod disengage, and then remove the block, so that the grinding sub-assembly can be quickly disassembled from the grinding sub-holder, and finally the new grinding sub-assembly can be re-inserted on the grinding sub-holder to complete the grinding sub-assembly overhaul operation, which is simple to operate and greatly improves the overhaul efficiency of the grinding sub-assembly; the structural design is simple, the preparation and implementation feasibility is high, and the practicability is strong.

[0004] To achieve the above-mentioned purpose, the technical solution of the utility model is to design a grinding sub-assembly that is easy to replace and repair, including a grinding sub-assembly, a grinding sub-assembly holder and an anti-slip assembly, the upper side of the grinding sub-assembly is provided with a back plate, the back plate is provided with a mounting groove with front and rear end openings, the end plate located in the middle of the front port or the middle of the rear port of the mounting groove divides the front port or the rear port of the mounting groove into two sockets located on the left and right sides, the grinding sub-assembly holder includes a base plate, the front end or the rear end of the base plate is provided with arm plates 1 and 2 extending outward, when the grinding sub-assembly and the grinding sub-assembly holder are assembled in place, the back plate is connected to the inside of the mounting groove, and the arm plates 1 and 2 are inserted from the left and right sides of the end plate The two sockets 1 correspond to each other and extend to the outside of the mounting groove. The arm plate 1 is provided with a socket 2 and a socket 3 along the front-to-back direction. The anti-detachment component includes a block and an n-shaped plug rod. The block is located in the gap between the arm plate 1 and the arm plate 2 and is fitted on the outer surface of the end plate. One end of the block is provided with a through hole, and the other end is pivotally connected to the arm plate 2 through a quick-release pivot assembly. The n-shaped plug rod has an arm rod 1 and an arm rod 2, and the length of the arm rod 1 is greater than the length of the arm rod 2. The arm rod 1 is limitedly connected to the inside of the socket 2 by an elastic limiting assembly that can be telescoped along the front-to-back direction, and the arm rod 2 is connected to the through hole of the block and the inside of the socket 3.

[0005] The utility model discloses a grinding sub-assembly which is convenient for replacement and maintenance. When replacing the grinding sub-assembly, the operator only needs to hold the N-shaped insert rod and apply force to the side away from the grinding sub-holder to make the second insert arm rod disengage from the through hole of the stopper, and then flip the stopper along the second arm plate as a fulcrum to make the quick-release pivotal assembly between the stopper and the second insert arm rod disengage, and then remove the stopper, so that the grinding sub-assembly can be quickly disassembled from the grinding sub-holder, and finally the new grinding sub-assembly can be re-inserted on the grinding sub-holder to complete the grinding sub-assembly maintenance operation. The operation is simple, and the maintenance efficiency of the grinding sub-assembly is greatly improved; the structural design is simple, the preparation and implementation feasibility is high, and the practicability is strong.

[0006] The preferred technical solution is that the arm plate 1 has a slot 1 with an opening toward the arm plate 2, the arm plate 2 is correspondingly provided with a slot 2 with an opening toward the arm plate 1, the jack 3 penetrates the slot 1, the block has one end with a through hole and is movably embedded in the slot 1, the other end of the block has an arc-shaped slot, the slot 2 has a block inside, and the block has an arc-shaped eaves body facing one side of the arm plate 1, the other end of the block is connected to the arc-shaped eaves body through the arc-shaped slot, the slot 2 and the arc-shaped eaves body constitute the quick-release pivot assembly. One end of the block is embedded in the slot 1 on the arm plate 1, and is plug-connected with the arm plate 1 through the arm rod 2 of the n-shaped plug rod. The quick-release pivot assembly has an ingenious structural design. When the grinding sub is inspected and replaced, the block can be quickly disassembled or installed on the arc-shaped eaves body, ensuring that the grinding sub assembly of the utility model that is easy to replace and inspect can be smoothly prepared and implemented.

[0007] A further preferred technical solution is that a step column extending coaxially along the length direction of the insert arm is milled on one end of the insert arm.

[0008] A further preferred technical solution is that the second jack is located on the side of the arm plate one away from the second arm plate, the second jack is a stepped hole structure that passes through the substrate, and the large diameter section of the second jack is located on the side of the substrate away from the first arm plate, one end of the arm rod is sleeved with a spring, and a spring support seat is sleeved and fixed on the step column, one end of the spring abuts on the step surface between the large diameter section and the small diameter section of the second jack, and the other end abuts on the spring support seat, and the spring, the large diameter section of the second jack and the spring support seat constitute the elastic limit assembly. The elastic limit assembly has a simple structural design and high feasibility in preparation and implementation.

[0009] A further preferred technical solution is that an annular groove is provided on the outer side of the end of the step column, a retaining ring for limiting and abutting the spring support seat is embedded inside the annular groove, the end of the spring support seat away from the spring is set as a countersunk groove structure, and the retaining ring is embedded inside the countersunk groove of the spring support seat. The retaining ring has a limiting and abutting effect on the spring support seat, so that the spring support seat can be sleeved on the step column, ensuring that the elastic limiting assembly can be quickly assembled, which helps to improve the assembly and processing efficiency of the grinding subassembly that is easy to replace and repair.

[0010] A further preferred technical solution is that the second socket is located on the side of the arm plate one away from the second arm plate, the second socket is a stepped hole structure that penetrates the substrate, and the large diameter section of the second socket is located on the side of the substrate away from the first arm plate, and also includes an internal threaded sleeve, the outer diameter of the internal threaded sleeve is less than the inner diameter of the large diameter section of the second socket, the step column is provided with a threaded outer surface, the internal threaded sleeve is screwed and fixed on the step column, and one end of the arm rod is also sleeved with a spring, one end of the spring abuts on the step surface between the large diameter section and the small diameter section of the second socket, and the other end abuts on the internal threaded sleeve, the spring, the large diameter section of the second socket and the internal threaded sleeve constitute the elastic limit assembly. The internal threaded sleeve is screwed and fixed on the step column, and the fixed installation method is simple, which helps to improve the assembly and processing efficiency of the grinding subassembly that is easy to replace and repair.

[0011] A further preferred technical solution is that an annular groove is provided on the inner side surface of the end of the large diameter section of the second jack, and a retaining ring is embedded in the annular groove for limiting the internal threaded sleeve to abut against the inside of the large diameter section of the second jack.

[0012] A further preferred technical solution is that a hexagonal nut is provided at one end of the internal thread sleeve away from the spring. The hexagonal nut helps to improve the convenience of clamping the internal thread sleeve when installing or removing it using a wrench, and helps to improve the assembly and processing efficiency of the grinding subassembly that is easy to replace and overhaul.

[0013] A further preferred technical solution is that the end of the hexagonal nut is provided with a group of notched grooves at both ends of the same diameter of its cross section, a split pin is inserted into the radial through hole at the end of the step column, and the two ends of the split pin extending out of the step column are correspondingly located inside the notched grooves of the hexagonal nut. The split pin has a rotation-stopping effect on the internal thread sleeve, thereby ensuring that the grinding subassembly of the utility model, which is easy to replace and overhaul, still has a good anti-loosening effect during long-term use.

[0014] A further preferred technical solution is that the block has an ear block extending away from the base plate, and the block has a weight-reducing groove. The ear block improves the convenience of holding the block, and the weight-reducing groove helps to reduce the weight of the block and improve the portability of holding.

[0015] The advantages and beneficial effects of the utility model are:

[0016] 1. The utility model provides a grinding sub-assembly which is convenient for replacement and maintenance. When replacing the grinding sub-assembly, the operator only needs to hold the N-shaped insert rod and apply force to the side away from the grinding sub-holder to make the second insert arm rod disengage from the through hole of the block, and then flip the block along the arm plate 2 as a fulcrum to make the quick-release pivot assembly between the block and the second insert arm rod disengage, and then remove the block, so that the grinding sub-assembly can be quickly disassembled from the grinding sub-holder, and finally the new grinding sub-assembly can be re-inserted on the grinding sub-holder to complete the grinding sub-assembly maintenance operation, which is simple to operate and greatly improves the maintenance efficiency of the grinding sub-assembly; the structural design is simple, the preparation and implementation feasibility is high, and the practicability is strong.

[0017] 2. One end of the stopper is embedded in a slot on an arm plate, and is plugged into the arm plate through an N-shaped plug arm. The quick-release pivot assembly is cleverly designed. When the grinding sub-assembly is overhauled or replaced, the stopper can be quickly disassembled or installed on the arc-shaped eaves, ensuring that the grinding sub-assembly that is easy to replace and overhaul can be smoothly prepared and implemented.

[0018] 3. The retaining ring acts as a limit abutment on the spring support seat, so that the spring support seat can be sleeved on the step column, ensuring that the elastic limit assembly can be quickly assembled, which helps to improve the assembly and processing efficiency of the grinding subassembly that is easy to replace and overhaul.

[0019] 4. The internal thread sleeve is screwed and fixed on the step column, and the fixing and installation method is simple, which helps to improve the assembly and processing efficiency of the grinding sub-assembly that is easy to replace and repair. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a left rear side perspective view of a grinding subassembly that is easy to replace and overhaul in Example 1;

[0021] Figure 2 It is a right front side perspective view of a grinding subassembly that is easy to replace and overhaul in Example 1;

[0022] Figure 3 This is a disassembled diagram of a grinding subassembly in Example 1 that is easy to replace and overhaul;

[0023] Figure 4 It is a three-dimensional picture of the grinding sub-holder;

[0024] Figure 5 It is a three-dimensional diagram of the stopper;

[0025] Figure 6 It is a three-dimensional diagram of an n-shaped plunger;

[0026] Figure 7 It is a top view (partial cross-section) of a grinding subassembly that is easy to replace and overhaul in Example 1;

[0027] Figure 8 yes Figure 7 A partial enlarged view of the H in the middle;

[0028] Fig. 9 It is a top view (partial cross-section) of a grinding subassembly that is easy to replace and overhaul in Example 2;

[0029] Fig.10 yes Fig. 9 A partial enlarged view of the S in the middle;

[0030] Fig.11 It is a top view of a grinding subassembly in Example 3 that is easy to replace and overhaul;

[0031] Fig.12 yes Fig.11 A partial enlarged view of the middle T;

[0032] Fig.13 It is a side view of a grinding subassembly in Example 3 that is easy to replace and overhaul.

[0033] In the figure: 1. grinder; 2. grinder support; 3. block; 4. n-shaped plug rod; 5. spring; 1-1. back plate; 1-1a. mounting groove; 1-1b. end plate; 1-1c. socket one; 2-1. base plate; 2-2. arm plate one; 2-2a. slot one; 2-2b. socket two; 2-2c. socket three; 2-3. arm plate two; 2-3a. slot two; 2-3b. block; 2-3c. arc-shaped eaves; 3-1. through hole; 3-2. arc-shaped slot; 3-3. ear block; 3-4. weight-reducing groove; 4-1. plug arm rod one; 4-1a. annular groove; 4-1b. step column; 4-2. plug arm rod two; A. spring support seat; B. retaining ring; C. internal thread sleeve; C-1. hexagonal nut; D. cotter pin. DETAILED DESCRIPTION

[0034] The following is a further description of the specific implementation of the present invention in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0035] Example 1

[0036] like Figures 1 to 8As shown, a grinding sub-assembly which is easy to replace and overhaul comprises a grinding sub-assembly, a grinding sub-holder 2 and an anti-slip assembly, wherein the grinding sub-assembly 1 has a back plate 1-1 on the upper side, and the back plate 1-1 has a mounting groove 1-1a with front and rear end openings, and an end plate 1-1b located in the middle of the front port or the middle of the rear port of the mounting groove 1-1a divides the front port or the rear port of the mounting groove 1-1a into two sockets 1-1c located on the left and right sides, and the grinding sub-holder 2 comprises a base plate 2-1, and the front or rear end of the base plate 2-1 is provided with an arm plate 1 2-2 and an arm plate 2 2-3 extending outward, and when the grinding sub-assembly 1 and the grinding sub-holder 2 are assembled in place, the back plate 1-1 is connected to the inside of the mounting groove 1-1a, and the arm plate 1 2-2 and the arm plate 2 2-3 correspond from the inside of the two sockets 1-1c located on the left and right sides of the end plate 1-1b. It passes through and extends to the outside of the mounting groove 1-1a, and the arm plate 1 2-2 is provided with a socket 2-2b and a socket 3 2-2c along the front-to-back direction. The anti-slip assembly includes a block 3 and an n-shaped plug rod 4. The block 3 is located in the gap between the arm plate 1 2-2 and the arm plate 2-3 and is located in close contact with the outer surface of the end plate 1-1b. One end of the block 3 is provided with a through hole 3-1, and the other end is pivotally connected to the arm plate 2-3 through a quick-release pivot assembly. The n-shaped plug rod 4 has an insert arm rod 1 4-1 and an insert arm rod 2 4-2, and the length of the insert arm rod 1 4-1 is greater than the length of the insert arm rod 2 4-2. The insert arm rod 1 4-1 is limitedly connected to the inside of the socket 2 2-2b by an elastic limiting assembly that can be telescoped along the front-to-back direction, and the insert arm rod 2 4-2 is connected to the through hole 3-1 of the block 3 and the inside of the socket 3 2-2c.

[0037] Preferably, the arm plate 1 2-2 has a slot 1 2-2a with an opening toward the arm plate 2-3, the arm plate 2-3 is correspondingly provided with a slot 2-3a with an opening toward the arm plate 1 2-2, the jack 3 2-2c passes through the slot 1 2-2a, one end of the block 3 having a through hole 3-1 is movably embedded in the slot 1 2-2a, the other end of the block 3 has an arc-shaped slot 3-2, the slot 2-3a has a block 2-3b, and the block 2-3b has an arc-shaped eaves 2-3c facing one side of the arm plate 1 2-2, the other end of the block 3 is connected to the arc-shaped eaves 2-3c through the arc-shaped slot 3-2, and the slot 2 2-3a and the arc-shaped eaves 2-3c constitute the quick-release pivot assembly.

[0038] Further preferably, the end of the insert arm rod 4-1 is also milled with a step column 4-1b extending coaxially along its length direction.

[0039] Further preferably, the jack 2-2b is located on the side of the arm plate 2-2 away from the arm plate 2-3, the jack 2-2b is a stepped hole structure that passes through the substrate 2-1, and the large diameter section of the jack 2-2b is located on the side of the substrate 2-1 away from the arm plate 2-2, the end of the arm rod 4-1 is sleeved with a spring 5, and a spring support seat A is sleeved and fixed on the step column 4-1b, one end of the spring 5 abuts on the step surface between the large diameter section and the small diameter section of the jack 2-2b, and the other end abuts on the spring support seat A, and the spring 5, the large diameter section of the jack 2-2b and the spring support seat A constitute the elastic limiting assembly.

[0040] Further preferably, an annular groove 4-1a is provided on the outer side surface of the end of the step column 4-1b, and a retaining ring B is embedded inside the annular groove 4-1a for limiting the abutment against the spring support seat A. The end of the spring support seat A away from the spring 5 is set as a countersunk groove structure, and the retaining ring B is embedded inside the countersunk groove of the spring support seat A.

[0041] Further preferably, the stopper 3 has an ear block 3 - 3 extending to a side away from the base plate 2 - 1 , and the stopper 3 has a weight-reducing groove 3 - 4 .

[0042] Example 2

[0043] like Figures 9-10 As shown, a grinding sub-assembly that is easy to replace and overhaul is different from the grinding sub-assembly that is easy to replace and overhaul in Example 1 in that: the socket 2-2b is located on the side of the arm plate 2-2 away from the arm plate 2-3, the socket 2-2b is a stepped hole structure that passes through the substrate 2-1, and the large diameter section of the socket 2-2b is located on the side of the substrate 2-1 away from the arm plate 2-2, and also includes an internal threaded sleeve C, the outer diameter of the internal threaded sleeve C is less than the inner diameter of the large diameter section of the socket 2-2b, the step column 4-1b is provided with a threaded outer surface, the internal threaded sleeve C is screwed and fixed on the step column 4-1b, and the end of the arm rod 4-1 is also sleeved with a spring 5, one end of the spring 5 abuts on the step surface between the large diameter section and the small diameter section of the socket 2-2b, and the other end abuts on the internal threaded sleeve C, the spring 5, the large diameter section of the socket 2-2b and the internal threaded sleeve C constitute the elastic limiting assembly.

[0044] Preferably, an annular groove 4-1a is provided on the inner side surface of the end of the large diameter section of the second jack 2-2b, and a retaining ring B is embedded in the annular groove 4-1a for limiting the internal threaded sleeve C to abut against the inside of the large diameter section of the second jack 2-2b.

[0045] Example 3

[0046] like Figures 11 to 13As shown, a grinding sub-assembly that is easy to replace and repair is different from the grinding sub-assembly that is easy to replace and repair in Example 2 in that: a hexagonal nut C-1 is provided at the end of the internal threaded sleeve C away from the spring 5.

[0047] Preferably, the end of the hexagonal nut C-1 is provided with a group of notched grooves located at both ends of the same diameter of its cross section, and a cotter pin D is inserted into the radial through hole at the end of the step column 4-1b. The two ends of the cotter pin D extending out of the step column 4-1b are correspondingly located inside the notched grooves of the hexagonal nut C-1.

[0048] The use principle of a grinding subassembly that is easy to replace and repair in Examples 1 to 3:

[0049] When inspecting and replacing the grinding wheel, the operator only needs to hold the n-shaped plug rod 4 and apply force to the side away from the grinding wheel holder 2 to make the plug arm rod 2 4-2 disengage from the through hole 3-1 of the stopper 3, and then flip the stopper 3 along the arc-shaped eaves 2-3c of the arm plate 2-3 as a fulcrum to disengage the quick-release pivot assembly between the stopper 3 and the arm plate 2-3, and then remove the stopper 3 to quickly remove the grinding wheel 1 from the grinding wheel holder 2; put a new grinding wheel on it. The mounting groove 1-1a of the grinder 1 is reinserted into the base plate 2-1 on the grinding sub-holder 2, and one end of the block 3 with the through hole 3-1 is movably embedded in the slot 2-2a of the arm plate 2-2. The arc-shaped slot 3-2 at the other end of the block 3 is clamped on the arc-shaped eaves 2-3c. The n-shaped insertion rod 4 is loosened, and the spring 5 is extended to make the arm rod 4-2 re-connected to the through hole 3-1 and the insertion hole 2-2b, thereby completing the grinding sub-maintenance operation.

[0050] The utility model discloses a grinding sub-assembly which is convenient for replacement and maintenance. When replacing the grinding sub-assembly, the operator only needs to hold the N-shaped insert rod and apply force to the side away from the grinding sub-holder to make the second insert arm rod disengage from the through hole of the stopper, and then flip the stopper along the second arm plate as a fulcrum to make the quick-release pivotal assembly between the stopper and the second insert arm rod disengage, and then remove the stopper, so that the grinding sub-assembly can be quickly disassembled from the grinding sub-holder, and finally the new grinding sub-assembly can be re-inserted on the grinding sub-holder to complete the grinding sub-assembly maintenance operation. The operation is simple, and the maintenance efficiency of the grinding sub-assembly is greatly improved; the structural design is simple, the preparation and implementation feasibility is high, and the practicability is strong.

[0051] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A grinding subassembly that is easy to replace and overhaul, characterized in that: The invention comprises a grinder (1), a grinder holder (2) and an anti-drop assembly, wherein the upper side of the grinder (1) is provided with a back plate (1-1), the back plate (1-1) is provided with a mounting groove (1-1a) with front and rear end openings, an end plate (1-1b) located in the middle of the front port or the middle of the rear port of the mounting groove (1-1a) divides the front port or the rear port of the mounting groove (1-1a) into two sockets (1-1c) located on the left and right sides, and the grinder holder (2) comprises a base plate ( 2-1), the front end or rear end of the base plate (2-1) is provided with an arm plate 1 (2-2) and an arm plate 2 (2-3) extending outward, when the grinding wheel (1) and the grinding wheel holder (2) are assembled in place, the back plate (1-1) is connected to the inside of the installation groove (1-1a), and the arm plate 1 (2-2) and the arm plate 2 (2-3) are correspondingly extended from the inside of two sockets 1 (1-1c) located on the left and right sides of the end plate (1-1b) and extend to the installation groove ( 1-1a), the arm plate 1 (2-2) is provided with a second plug hole (2-2b) and a third plug hole (2-2c) along the front-back direction, the anti-slip assembly comprises a stopper (3) and an n-shaped plug rod (4), the stopper (3) is located in the gap between the arm plate 1 (2-2) and the arm plate 2 (2-3) and is located on the outer side of the end plate (1-1b), one end of the stopper (3) is provided with a through hole (3-1), and the other end is connected to the end plate (1-1b) through a quick-release pivot assembly. The arm plate 2 (2-3) is pivotally connected, the N-shaped insertion rod (4) comprises an insertion arm rod 1 (4-1) and an insertion arm rod 2 (4-2), and the length of the insertion arm rod 1 (4-1) is greater than the length of the insertion arm rod 2 (4-2), the insertion arm rod 1 (4-1) is limitedly connected to the inside of the second insertion hole (2-2b) by an elastic limiting component that can be extended and retracted along the front-back direction, and the insertion arm rod 2 (4-2) is connected to the through hole (3-1) of the stopper (3) and the inside of the third insertion hole (2-2c).

2. The grinding subassembly that is easy to replace and overhaul as claimed in claim 1 is characterized in that: The arm plate 1 (2-2) has a slot 1 (2-2a) with an opening toward the arm plate 2 (2-3), the arm plate 2 (2-3) is correspondingly provided with a slot 2 (2-3a) with an opening toward the arm plate 1 (2-2), the jack 3 (2-2c) penetrates the slot 1 (2-2a), the stopper (3) has one end with a through hole (3-1) movably embedded in the slot 1 (2-2a), and the other end of the stopper (3) is The first end of the stopper (3) has an arc-shaped slot (3-2), the second slot (2-3a) has a block (2-3b) inside, and the block (2-3b) has an arc-shaped eaves (2-3c) facing the side of the arm plate (2-2), the other end of the stopper (3) is connected to the arc-shaped eaves (2-3c) through the arc-shaped slot (3-2), and the second slot (2-3a) and the arc-shaped eaves (2-3c) constitute the quick-release pivot assembly.

3. The grinding subassembly that is easy to replace and overhaul as claimed in claim 2, characterized in that: The end of the insert arm rod (4-1) is also milled with a step column (4-1b) extending coaxially along its length direction.

4. The grinding subassembly that is easy to replace and overhaul as claimed in claim 3 is characterized in that: The second plug hole (2-2b) is located on the side of the arm plate (2-2) away from the arm plate (2-3), the second plug hole (2-2b) is a stepped hole structure that penetrates the base plate (2-1), and the large diameter section of the second plug hole (2-2b) is located on the side of the base plate (2-1) away from the arm plate (2-2), the end of the first plug arm rod (4-1) is sleeved with a spring (5), the step column (4-1b) is sleeved and fixed with a spring support seat (A), one end of the spring (5) abuts against the step surface between the large diameter section and the small diameter section of the second plug hole (2-2b), and the other end abuts against the spring support seat (A), the spring (5), the large diameter section of the second plug hole (2-2b) and the spring support seat (A) constitute the elastic limit assembly.

5. The grinding subassembly that is easy to replace and overhaul as claimed in claim 4 is characterized in that: An annular groove (4-1a) is provided on the outer side surface of the end of the step column (4-1b), and a retaining ring (B) for limiting and abutting against the spring support seat (A) is embedded inside the annular groove (4-1a). The end of the spring support seat (A) away from the spring (5) is set as a countersunk groove structure, and the retaining ring (B) is embedded inside the countersunk groove of the spring support seat (A).

6. The grinding subassembly that is easy to replace and overhaul as claimed in claim 3, characterized in that: The second plug hole (2-2b) is located on the side of the arm plate (2-2) away from the arm plate (2-3), the second plug hole (2-2b) is a stepped hole structure that penetrates the base plate (2-1), and the large diameter section of the second plug hole (2-2b) is located on the side of the base plate (2-1) away from the arm plate (2-2), and also includes an internal thread sleeve (C), the outer diameter of the internal thread sleeve (C) is less than the inner diameter of the large diameter section of the second plug hole (2-2b), and the step column (4-1b) is provided with a thread The inner thread sleeve (C) is threadedly fixed on the step column (4-1b), and the end of the insert arm rod (4-1) is also sleeved with a spring (5), one end of the spring (5) abuts against the step surface between the large diameter section and the small diameter section of the second insertion hole (2-2b), and the other end abuts against the inner thread sleeve (C), and the spring (5), the large diameter section of the second insertion hole (2-2b) and the inner thread sleeve (C) constitute the elastic limit assembly.

7. The grinding subassembly that is easy to replace and overhaul as claimed in claim 6, characterized in that: An annular groove (4-1a) is provided on the inner side surface of the end of the large diameter section of the second plug hole (2-2b), and a retaining ring (B) is embedded in the annular groove (4-1a) for limiting the internal thread sleeve (C) to abut against the inside of the large diameter section of the second plug hole (2-2b).

8. The grinding subassembly that is easy to replace and overhaul as claimed in claim 6, characterized in that: The end of the internal thread sleeve (C) away from the spring (5) is provided with a hexagonal nut (C-1).

9. The grinding subassembly that is easy to replace and overhaul as claimed in claim 8, characterized in that: The end of the hexagonal nut (C-1) is provided with a group of notched grooves located at both ends of the same diameter of its cross section, and a cotter pin (D) is inserted into the radial through hole located at the end of the step column (4-1b), and the two ends of the cotter pin (D) extending out of the step column (4-1b) are correspondingly located inside the notched grooves of the hexagonal nut (C-1).

10. The grinding subassembly that is easy to replace and overhaul as claimed in any one of claims 1 to 9, characterized in that: The stopper (3) has an ear block (3-3) extending toward a side away from the base plate (2-1), and the stopper (3) has a weight-reducing groove (3-4).

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