Hydraulic cylinder top joint and method for medium-crushing impact crusher

Abstract

The present invention and the technical field of crushers specifically relate to a top joint and method of a hydraulic cylinder for a medium-crushing impact crusher, comprising a U-shaped joint frame and a threaded joint arranged at the bottom thereof; slideways are arranged on the two opposite inner side walls of the joint frame, and a slider is arranged on the slideway; an upper arc groove is arranged at the bottom of the slider; a lower arc groove opposite to the upper arc groove is arranged at the bottom of the inner side of the joint frame, and the slider can slide down along the slideway to the bottom of the joint frame, and the upper arc groove and the lower arc groove form a complete pin shaft hole. Two upper inclined surfaces are symmetrically arranged on both sides of the upper arc groove; two lower inclined surfaces are symmetrically arranged on both sides of the lower arc groove, and when the upper arc groove and the lower arc groove are combined to form a pin shaft hole, the upper inclined surface can be in close contact with the lower inclined surface to ensure that the pin shaft can be inserted into the pin shaft hole. The present invention ensures that the hydraulic cylinder of the crusher is protected to the maximum extent when carrying materials, and ensures that the operator can easily and quickly switch the hydraulic cylinder joint between the maintenance and carrying material positions.

Description

Technical Field

[0001] The present invention and the technical field of crushers particularly relate to a hydraulic cylinder top joint and method for a medium-crushing impact crusher. Background Art

[0002] Medium crushing impact crusher is a very important and commonly used crusher type in cement, sand and gravel aggregate and other non-metallic mining fields. It is generally used after coarse crushing to crush brittle rocks with a particle size of less than 500mm to achieve a discharge particle size of <30mm to meet the finished product particle size and output requirements of mining production.

[0003] like Figure 1 As shown, the existing general-purpose machine is generally composed of a rotor 1, two impact plates 2, a leveling plate 3, a housing 4, etc. The specific principle process is that the material enters the crusher, is hit by the rotor, is thrown to the impact plate and rebounds back, and is hit by the rotor again. After the two impact plates act repeatedly, the material reaches a certain particle size requirement, and then is brought into the leveling plate by the rotor. The leveling plate is one of the important components of the crusher. Its function is to crush and shape the above-mentioned incoming material for the last time to achieve the required particle size, and to shape it so that it meets the requirements from particle size to particle shape.

[0004] The existing impact plate adjustment and protection device includes an adjustment frame, a base frame, a suspension screw assembly, a spring support screw assembly, a spring, and an adjustment hydraulic cylinder. The suspension screw assembly pulls the impact plate and suspends it on the shell to prevent it from falling; multiple spring assemblies are supported on the shell through springs, and the other end of the spring presses the adjustment frame on the shell and has a certain preload force that adapts to the normal crushing force, thereby ensuring that the entire impact plate will not swing backward when subjected to the normal crushing force; the hydraulic cylinder plays a role in adjusting the gap between the impact plate and the rotor.

[0005] When the gap between the impact plate and the rotor is adjusted to a smaller size, first unscrew the external clamping nut and the sleeve to the distance to be adjusted, push the hydraulic cylinder out until the adjustment frame contacts the external clamping nut, then unscrew the locking nut until it contacts the adjustment frame, and finally retract the hydraulic cylinder to its original position; when the gap between the impact plate and the rotor is adjusted to a larger size, first push the hydraulic cylinder out to the distance to be adjusted, then unscrew the locking nut until it contacts the housing, retract the hydraulic cylinder to its original position, and finally tighten the external clamping nut and the sleeve.

[0006] When foreign matter enters the crusher or the throughput exceeds the design range, the crushing force of the material ejected by the rotor on the impact plate will exceed the preset range. At this time, when the crushing force transmitted to the spring is greater than the spring preload, the spring is compressed, and the entire impact plate is pushed back, thereby increasing the gap and allowing foreign matter to pass through. When the foreign matter is discharged, the impact plate is returned to its initial position under the pressure of the spring; when crushing rocks under normal working conditions, the crushing force is generally less than the spring preload, so the impact plate remains in place to ensure the particle size of the material.

[0007] However, when the impact plate was adjusted and used in the actual factory, it was found that the hydraulic cylinder adjustment system had some defects. For example, when the hydraulic cylinder was adjusted, the hydraulic cylinder joint needed to compress the spring by pushing the adjustment frame to move through the pin shaft, and then adjust the nut to achieve it. However, during production, as mentioned above, when the impact plate enters foreign matter, it pops up protectively. If the hydraulic cylinder is still connected to the pin shaft at this time, the hydraulic cylinder rod will be broken and stretched out, causing damage to the hydraulic cylinder oil pipe and valve. Therefore, the pin shaft needs to be removed when the crusher is carrying materials. However, this leads to another problem. The hydraulic cylinder is hinged to the base frame through an intermediate swing shaft. At this time, the hydraulic cylinder may swing freely in the adjustment frame. When the impact plate pops up protectively and returns to its original position, it is likely to cause the hydraulic cylinder to swing to one side under the action of gravity, and be damaged by the interference of the welding block at the connection position of the adjusting frame pin shaft. As mentioned above, a contradiction is formed. In order to solve this contradiction, the original model adds a support at the bottom of the hydraulic cylinder. When adjusting, the pin shaft is inserted and the support is removed (because the hydraulic cylinder will swing slightly during adjustment, and interfere with the support and destroy the structure) to perform the operation; when the material is broken, the pin shaft is removed and the support is installed at the same time to control the hydraulic cylinder from swinging freely, ensuring that the hydraulic cylinder will not be damaged when the impact plate rebounds protectively.

[0008] This solution is relatively feasible, but during on-site operation, it was found that the process is troublesome and cumbersome. It is not easy to disassemble and assemble the support, and on-site personnel are prone to neglect the operation process, resulting in forgetting to remove the pin when carrying materials, forgetting to install the support, or forgetting to take off the support when adjusting, resulting in damage accidents and economic losses. Summary of the invention

[0009] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0010] A top joint of a hydraulic cylinder for a medium-crushing impact crusher, the top joint comprising a U-shaped joint frame and a threaded joint arranged at the bottom thereof; slideways are arranged on two opposite side walls inside the joint frame, and a slider is arranged on the slideway; an upper arc groove is arranged at the bottom of the slider; a lower arc groove opposite to the upper arc groove is arranged at the bottom of the inner side of the joint frame, the slider can slide down along the slideway to the bottom of the joint frame, and the upper arc groove and the lower arc groove form a complete pin shaft hole.

[0011] As a preferred technical solution, two upper inclined surfaces are symmetrically provided on both sides of the upper arc groove; two lower inclined surfaces are symmetrically provided on both sides of the lower arc groove. When the upper arc groove and the lower arc groove are combined to form a pin shaft hole, the upper inclined surfaces can be in close contact with the lower inclined surfaces to ensure that the pin shaft can be inserted into the pin shaft hole.

[0012] As a preferred technical solution, a horizontal positioning hole perpendicular to the axial direction of the pin shaft hole is provided in the slider, and upper positioning holes with the same diameter as the horizontal positioning hole are provided on both sides of the top of the joint frame, and the location of the upper positioning holes is the upper material belt position; lower positioning holes with the same diameter as the horizontal positioning hole are provided on both sides of the bottom of the joint frame, and the location of the lower positioning holes is the lower maintenance position, and the lower positioning holes are arranged above the lower arc groove; when the slider moves to the upper material belt position, the positioning pin is inserted into the upper positioning hole and the horizontal positioning hole of the slider; when the slider moves to the lower maintenance position, the positioning pin is also inserted into the lower positioning hole and the horizontal positioning hole of the slider.

[0013] As a preferred technical solution, when adjusting, push the slider to the maintenance position at the bottom of the joint frame, engage the upper and lower arc grooves, and press the upper and lower inclined surfaces tightly together. Insert the pin into the lower positioning hole and the horizontal positioning hole of the slider, and insert the hydraulic cylinder pin into the engaged pin hole. At this time, adjustment can be carried out. When the crusher is running with materials, push the slider to the upper material position, and insert the pin into the upper positioning hole and the horizontal positioning hole of the slider.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The top joint of the hydraulic cylinder of the impact plate of the present invention ensures that the hydraulic cylinder of the crusher is protected to the maximum extent when carrying materials, and ensures that the operator can easily and quickly switch the hydraulic cylinder joint between the maintenance and carrying positions, thereby reducing the downtime for maintenance and the probability of misoperation.

[0016] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In the attached picture:

[0018] Figure 1 It is a schematic diagram of the overall structure of a medium-crushing impact crusher in the prior art;

[0019] Figure 2 It is a schematic diagram of the overall structure of the medium-crushing impact crusher of the present invention;

[0020] Figure 3 It is a schematic diagram of the overall structure of the counterattack plate part of the present invention;

[0021] Figure 4 It is a schematic diagram of the overall structure of the first regulating and protecting device of the present invention;

[0022] Figure 5 It is a schematic diagram of the structure of the suspension screw assembly of the present invention;

[0023] Figure 6 It is a schematic structural diagram of a spring screw assembly of the present invention;

[0024] Figure 7 The first adjustment protection device of the present invention is in a state before adjustment;

[0025] Figure 8 To continue Figure 7 Afterwards, the outer compression nut and the first sheath are screwed out toward the impact plate side;

[0026] Fig. 9 To continue Figure 8 Later, the hydraulic cylinder is lifted and contacts the outer compression nut;

[0027] Fig.10 To continue Fig. 9 Afterwards, the inner compression nut is lifted and contacts the adjustment frame;

[0028] Fig.11 For the continuation Fig.10 Later, the schematic diagram of the hydraulic cylinder retracting to its original position;

[0029] Fig.12 It is a schematic diagram of the installation of the top joint of the present invention;

[0030] Fig.13 It is a schematic structural diagram of the top joint of the present invention;

[0031] Fig.14 It is a schematic diagram of a slider in the top joint of the present invention in the lower maintenance position;

[0032] Fig.15 It is a schematic diagram of the slider in the top joint of the present invention with the material level at the upper part.

[0033] In the figure: 1. rotor;

[0034] 2. Counterattack plate; 21. Counterattack plate body; 22. First adjustment protection device; 22-1. Base frame; 22-2. Suspension screw assembly; 22-21. U-shaped connecting plate; 22-22. First locking nut; 22-23. Anti-loosening gasket; 22-24. Inner clamping nut; 22-25. Outer clamping nut; 22-26. Shock-absorbing disc spring; 22-27. First sheath; 22-28. Top nut; 22-29. Suspension screw; 22-3. Adjustment frame; 22-4. Spring screw assembly; 22-41. Spring screw; 22-42. Second locking nut; 22-43. Second sheath; 22-44, pressure plate; 22-45, spring; 22-46, pressure cap; 22-5, impact plate adjustment hydraulic cylinder; 22-51, impact plate adjustment hydraulic cylinder joint frame; 22-51-1, slideway; 22-51-2, lower arc groove; 22-51-3, lower inclined surface; 22-52, threaded joint; 22-54, slider; 22-54-1, upper arc groove; 22-54-2, upper inclined surface; 22-54-3, horizontal positioning hole; 22-54-4, upper positioning hole; 22-54-5, lower positioning hole; 22-512, pin; 23, impact plate lining;

[0035] 3. Leveling the plate; 4. Shell. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention.

[0037] like Figure 2 As shown, a medium-hard rock medium-crushing impact crusher includes a rotor 1, an impact plate 2, a leveling plate 3 and a shell 4.

[0038] like Figures 3 to 5As shown, the counter-attack plate portion 2 includes a counter-attack plate body 21 and a counter-attack plate portion adjusting and protecting device 22; the structure of the counter-attack plate portion 2 remains unchanged on the basis of the prior art, and the innovation of the counter-attack plate portion adjusting and protecting device 22 is as follows: the counter-attack plate portion adjusting and protecting device 22 includes a horizontally arranged base frame 22-1, vertically suspended screw rod assemblies 22-2 arranged on both sides of the base frame 22-1, an adjusting frame 22-3 arranged between the two suspended screw rod assemblies 22-2, a spring screw assembly 22-4 and a counter-attack plate adjusting hydraulic cylinder 22-5; the base frame 22-1 is connected to the housing 4; the suspended screw assembly 22-2 includes a U-shaped connecting plate 22-21 connected to the counter-attack plate body 21 through a pin shaft, and the U-shaped connecting plate 22-2 1 is connected to the suspension screw 22-29 through the first locking nut 22-22, and a locking gasket 22-23 is provided between the first locking nut 22-22 and the U-shaped connecting plate 22-21; the end of the suspension screw 22-29 away from the U-shaped connecting plate 22-21 is clamped on the adjustment frame 22-3 through the inner clamping nut 22-24 and the outer clamping nut 22-25, and the inner clamping nut 22-24 is pressed on the bottom frame 22-1 through the damping disc spring 22-26, and the outer clamping nut 22-25 is provided with a first sleeve 22-27 threadedly connected to the outside of the suspension screw 22-29, and the top of the first sleeve 22-27 is provided with a top nut 22-28 threadedly connected to the suspension screw 22-29. The suspension screw assembly 22-2 pulls the counterattack plate body 21 and is suspended on the shell 4 through the bottom frame 22-1, so that the counterattack plate body 21 will not fall down.

[0039] like Figure 6 As shown, the spring screw assembly 22-4 includes a spring screw 22-41 that passes through the base frame 22-1 and the adjusting frame 22-3, and the spring screw 22-41 is connected to the base frame 22-1 through a second locking nut 22-42 so as to be fixed inside the shell 4, and a pressure plate 22-44 is provided on the top of the spring screw 22-41, and a pressure cap 22-46 and a second sheath 22-43 that are threadedly connected to the outside of the spring screw 22-41 are provided above the pressure plate 22-44 in sequence, and a spring 22-45 is sleeved on the spring screw 22-41 between the pressure plate 22-44 and the adjusting frame 22-3, and the pressure plate 22-44 presses the spring 22-45 through the pressure cap 22-46, and the other end of the spring 22-45 presses the adjusting frame 22-3 on the shell 4, and has a certain pre-tightening force that adapts to the normal crushing force, thereby ensuring that the entire impact plate body 21 will not swing backward when subjected to the normal crushing force.

[0040] There are two impact plate adjustment hydraulic cylinders 22-5, which are symmetrically arranged between the two suspension screw assemblies 22-2. The cylinder body of the impact plate adjustment hydraulic cylinder 22-5 is hinged on the base frame 22-1, and the top joint of the cylinder rod is connected to the adjustment frame 22-3 through a pin shaft. The hydraulic cylinder 22-5 is used to adjust the distance between the impact plate body 21 and the rotor 1.

[0041] In short, compared with the original structure, the suspension screw assembly 22-2 has changed from an adjustment and suspension function to a suspension function only, and the adjustment function is realized by the adjustment hydraulic cylinder 22-5. Figures 7 to 11 As shown, the adjustment principle of the impact plate adjustment protection device 22 is as follows: when the distance between the impact plate portion 2 and the rotor 1 is adjusted to be smaller, the outer clamping nut 22-25 and the first sleeve 22-27 are first screwed outward to the distance to be adjusted, and then the cylinder rod of the hydraulic oil cylinder 22-5 drives the adjustment frame 22-3 to be pushed out to the same side until the adjustment frame 22-3 contacts the outer clamping nut, and then the inner locking nut is screwed out to the side of the impact plate portion 2 until it contacts the adjustment frame 22-3 again, and finally the cylinder body of the hydraulic oil cylinder 22-5 drives the adjustment frame 22-3 to retract , so that the suspension screw assembly 22-2 drives the impact plate 2 to move toward the rotor 1 side, so that the distance between the impact plate 2 and the rotor 1 becomes smaller; when the distance between the impact plate 2 and the rotor 1 is increased, the adjustment frame 22-3 is first pushed out to the distance to be adjusted by the hydraulic cylinder 22-5, and then the inner locking nut 22-24 is screwed toward the rotor 1 side until it contacts the housing 4, and the hydraulic cylinder 22-5 is retracted to the original position toward the rotor 1 side, so that the inner locking nut contacts the base frame 22-1, and finally the outer clamping nut and the first sleeve 22-27 are tightened toward the rotor 1 side.

[0042] The spring screw 22-41 on the spring screw assembly 22-4 is connected to the housing 4, and the spring 22-45 is pressed on the adjustment frame 22-3 by the pressure cap 22-46 and the pressure plate 22-44, so that the impact plate 2 is kept in place by pressing the adjustment frame 22-3. During normal production, the impact force formed by the material on the impact plate body 21 is less than the pre-pressure of the spring 22-45, and the impact plate body 21 remains stationary; when the crusher enters the hard-to-crush foreign matter or overload, the foreign matter and the material will be hit to the impact plate body 21, causing a strong impact on it. When the impact force is greater than the pre-compression force set by the spring 22-45, the spring 22-45 will be compressed, so that the impact plate body 21 moves backward, the gap between the impact plate and the rotor 1 increases, and the foreign matter or overloaded material is partially discharged. At this time, the pressure of the impact plate body 21 is reduced, and the spring 22-45 presses the impact plate body 21 back to its original position, thereby realizing the protection of the impact plate and the crusher structure as a whole. This structure uses hydraulic structure instead of mechanical adjustment, which greatly increases the adjustment force and adjustment rate. It is also very simple to operate, greatly reduces downtime for maintenance, and improves the factory's production efficiency.

[0043] The adjustment of the above-mentioned counter-attack plate adjustment hydraulic cylinder 22-5 is achieved by the top joint of the hydraulic cylinder 22-5 cylinder rod pushing the adjustment frame 22-3 to move through the pin to compress the spring 22-45, and then adjusting the nut. However, during production, as mentioned above, when a foreign object enters the counter-attack plate 2 space, it will immediately pop out for protection. If the top joint of the hydraulic cylinder 22-5 (standard self-contained joint) is still connected to the pin at this time, the cylinder rod will be forced to extend, resulting in damage to the oil pipe and valve of the hydraulic cylinder 22-5. Therefore, the pin needs to be removed when the crusher is carrying materials, but this derives another problem. The hydraulic cylinder 22-5 is hinged to the base frame 22-1 through the intermediate swing shaft. At this time, the hydraulic cylinder 22-5 may swing freely in the adjustment frame 22-3. When the counter-attack plate is protectively popped out and returns to its original position, it is likely that the hydraulic cylinder 22-5 will swing to one side under the action of gravity, and be interfered by the welding block at the pin connection position of the adjustment frame 22-3, thereby being damaged. In order to solve this problem, the present invention also innovates the top joint of the hydraulic cylinder 22-5 cylinder rod.

[0044] Specifically, Figures 12 to 13As shown, the top joint includes a U-shaped joint frame 22-51 and a threaded joint 22-52 arranged at the bottom thereof. The threaded joint 22-52 is consistent with the original joint of the corresponding hydraulic cylinder 22-5, so as to replace the original joint to connect the cylinder rod; the two opposite side walls of the inner side of the joint frame are provided with slideways 22-51-2, and the slideway 22-51-2 is provided with a slider 22-54, so that the slider 22-54 can move flexibly on the joint frame; the slider 22- An upper arc groove 22-54-1 is provided at the bottom of the joint frame; a lower arc groove 22-51-2 is provided at the bottom of the inner side of the joint frame, which is opposite to the upper arc groove 22-54-1, so that the slider 22-54 can slide down along the slideway 22-51-2 to the bottom of the joint frame until the upper arc groove 22-54-1 and the lower arc groove 22-51-2 form a complete pin shaft hole; two upper inclined surfaces 22-54-1 are symmetrically provided on both sides of the upper arc groove 22-54-1. 2; Two lower inclined surfaces 22-51-3 are symmetrically arranged on both sides of the lower arc groove 22-51-2. When the upper arc groove 22-54-1 and the lower arc groove 22-51-2 are combined to form a pin hole, the upper inclined surface 22-54-2 can be in close contact with the lower inclined surface 22-51-3 to ensure that the pin can be inserted into the pin hole; In addition, the slider 22-54 is provided with a horizontal positioning hole 22-54-3 which is perpendicular to the axial direction of the pin hole, and the joint frame Upper positioning holes 22-54-4 with the same diameter as the horizontal positioning holes 22-54-3 are provided on both sides of the top of 22-51, and the location of the upper positioning holes 22-54-4 is the material position; lower positioning holes 22-54-5 with the same diameter as the horizontal positioning holes 22-54-3 are provided on both sides of the bottom of the joint frame, and the location of the lower positioning holes 22-54-5 is the adjustment and maintenance position, and the lower positioning holes 22-54-5 are provided above the lower arc groove 22-51-2. The upper positioning holes 22-54-4, the lower positioning holes 22-54-5 and the positioning holes of the slider 22-54 are used to install the pin shaft 22-512 when the slider 22-54 is positioned in the upper and lower positions, so that the slider 22-54 is firmly positioned in two positions.

[0045] like Figures 14 to 15As shown, during adjustment, push the slider 22-54 to the inspection position at the bottom of the joint frame, engage the upper arc groove 22-54-1 and the lower arc groove 22-51-2, and press the upper inclined surface 22-54-2 and the lower inclined surface 22-51-3 tightly. Insert the pin 22-512 into the lower positioning hole 22-54-5 and the positioning hole of the slider 22-54, and insert the pin of the hydraulic cylinder 22-5 into the engaged pin hole. At this time, the adjustment work can be carried out. When the crusher is running with materials, push the slider 22-54 to the upper material carrying position, insert the pin 22-512 into the upper positioning hole 22-54-4 and the positioning hole of the slider 22-54, and insert the pin of the hydraulic cylinder 22-5 The shaft does not need to be taken out of the lower arc groove 22-51-2, so that when the impact plate rebounds protectively, the upper part of the pin of the hydraulic cylinder 22-5 has enough space to move without obstruction (the specific length is calculated by the actual demand), so that the cylinder rod of the hydraulic cylinder 22-5 will not be forced to extend. At the same time, when the impact plate 2 rebounds, the middle swing axis of the hydraulic cylinder 22-5 swings on the bottom frame 22-1, which will not cause interference with the top joint when the adjustment frame 22-3 is pressed back; and the lower inclined surface 22-51-3 at the bottom of the joint frame allows the pin of the hydraulic cylinder 22-5 to enter the lower arc groove 22-51-2 when the impact plate 2 is pressed back after the foreign body passes, and will not cause jamming. As a result, the hydraulic cylinder 22-5 is protected to the maximum extent when running with materials, and the above process is very simple. It only needs to adjust the slider 22-54 between the maintenance and material carrying position according to the needs on site, and it will not cause the operator to forget.

[0046] The embodiments of the present invention are described in detail above, but the contents described are only preferred embodiments of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A hydraulic cylinder top joint for a medium-sized impact crusher, characterized in that: The top joint includes a U-shaped joint frame and a threaded joint arranged at the bottom thereof; slideways are arranged on the two opposite inner side walls of the joint frame, and a slider is arranged on the slideway; an upper arc groove is arranged at the bottom of the slider; a lower arc groove opposite to the upper arc groove is arranged at the bottom of the inner side of the joint frame, and the slider can slide down along the slideway to the bottom of the joint frame, and the upper arc groove and the lower arc groove form a complete pin shaft hole; the hydraulic cylinder pin shaft is inserted into the pin shaft hole after being engaged.

2. The hydraulic cylinder top joint for a medium-sized impact crusher according to claim 1, characterized in that: Two upper inclined surfaces are symmetrically provided on both sides of the upper arc groove; two lower inclined surfaces are symmetrically provided on both sides of the lower arc groove. When the upper arc groove and the lower arc groove are combined to form a pin shaft hole, the upper inclined surfaces can be in close contact with the lower inclined surfaces to ensure that the pin shaft can be inserted into the pin shaft hole.

3. The hydraulic cylinder top joint for a medium-sized impact crusher according to claim 2, characterized in that: A horizontal positioning hole is provided in the slider and is axially perpendicular to the pin shaft hole. Upper positioning holes with the same diameter as the horizontal positioning hole are provided on both sides of the top of the joint frame, and the upper positioning holes are located at the upper material-carrying position; lower positioning holes with the same diameter as the horizontal positioning hole are provided on both sides of the bottom of the joint frame, and the lower positioning holes are located at the lower maintenance position, and the lower positioning holes are arranged above the lower arc-shaped groove; when the slider moves to the upper material-carrying position, a positioning pin is inserted into the upper positioning hole and the horizontal positioning hole of the slider; when the slider moves to the lower maintenance position, a positioning pin is also inserted into the lower positioning hole and the horizontal positioning hole of the slider.

4. The working method of the hydraulic cylinder top joint for a medium-crushing impact crusher according to claim 3, characterized in that: When adjusting, push the slider to the inspection position at the bottom of the joint frame, engage the upper and lower arc grooves, press the upper and lower inclined surfaces tightly, insert the pin into the lower positioning hole and the horizontal positioning hole of the slider, and insert the hydraulic cylinder pin into the engaged pin hole. At this time, adjustment can be carried out; when the crusher is running with materials, push the slider to the upper material position, and insert the pin into the upper positioning hole and the horizontal positioning hole of the slider.

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