CN116351514A - Hydraulic cylinder top joint and method for medium crushing type impact crusher - Google Patents

Abstract

The invention relates to the technical field of crushers, in particular to a joint and a method for the top of a hydraulic cylinder of a medium crushing type impact crusher, comprising a U-shaped joint frame and a threaded joint arranged at the bottom of the U-shaped joint frame; slide ways are arranged on two opposite side walls of the inner side of the connector frame, and slide blocks are arranged on the slide ways; the bottom of the sliding block is provided with an upper arc-shaped groove; the bottom of the inner side of the connector frame is provided with a lower arc-shaped groove opposite to the upper arc-shaped groove, the sliding block can slide down to the bottom of the connector frame along the sliding way, and the upper arc-shaped groove and the lower arc-shaped groove form a complete pin shaft hole. Two upper inclined planes are symmetrically arranged at two sides of the upper arc-shaped groove; two sides of the lower arc-shaped groove are symmetrically provided with two lower inclined planes, and when the upper arc-shaped groove and the lower arc-shaped groove are clasped into a pin shaft hole, the upper inclined planes can be contacted and clung to the lower inclined planes so as to ensure that the pin shaft can be inserted into the pin shaft hole. The invention ensures that the hydraulic cylinder is protected to the greatest extent when the crusher is in material taking, and ensures that operators can simply and rapidly switch the hydraulic cylinder joint between overhauling and material taking positions.

Description

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

Technical Field

The invention belongs to the technical field of crushers, and particularly relates to a hydraulic cylinder top joint and a hydraulic cylinder top joint method for a medium crushing type impact crusher.

Background

The medium crushing impact crusher is a crusher type which is very important and commonly used in the fields of cement, gravel aggregate and other nonmetallic mining industries, and is generally used for crushing brittle rock with the grain size smaller than 500mm after coarse crushing operation, so that the purpose of discharging grain size smaller than 30mm is achieved, and the requirements of the granularity and yield of finished products produced in mines are met.

As shown in fig. 1, the conventional general machine type is generally composed of a rotor 1, two impact plate portions 2, an equalizing plate portion 3, a housing 4, and the like. The concrete principle flow is that the material enters the crusher, after being hit by the rotor, is thrown to the impact plate part and bounces back, and is received to be hit again by the rotor, after the two impact plate parts repeatedly act in this way, the material reaches the requirement of certain granularity, then is brought into the equalizing plate part by the rotor, the equalizing plate part is one of important component parts of the crusher, the effect is that the material is crushed and molded for the last time, the required granularity is reached, and the material is shaped, so that the granularity to the granularity meet the requirement,

the adjusting and protecting device of the existing impact plate comprises an adjusting frame, an underframe, a suspension screw assembly, a spring supporting screw assembly, a spring and an adjusting hydraulic cylinder. The suspension screw rod component pulls the impact plate part and is suspended on the shell, so that the impact plate part cannot fall down; the plurality of spring assemblies are supported on the shell through springs, the other ends of the springs press the adjusting frames on the shell, and the springs have pretightening force which is suitable for normal crushing force, so that the whole impact plate part is ensured not to swing backwards when the impact plate part receives normal crushing force; the hydraulic cylinder plays a role in adjusting the clearance between the impact plate and the rotor.

When the distance between the impact plate and the rotor is reduced, firstly, screwing out an external compression nut and a sheath for adjusting the distance, ejecting the hydraulic cylinder until the adjusting frame is contacted with the external compression nut, screwing out the locking nut until the locking nut is contacted with the adjusting frame, and finally, retracting the hydraulic cylinder to a home position; when the distance between the impact plate and the rotor is increased, the hydraulic cylinder is firstly ejected to the distance to be adjusted, then the locking nut is screwed out until the locking nut contacts with the shell, the hydraulic cylinder is retracted to the original position, and finally the external compression nut and the sheath are screwed.

When the foreign matter enters the crusher or the throughput exceeds the design range, the crushing force of the material split by the rotor on the impact plate exceeds the preset range, and when the crushing force transmitted to the spring is larger than the pre-tightening force of the spring, the spring is compressed, and the whole impact plate part is retracted backwards, so that the gap is enlarged to pass through the foreign matter. The impact plate returns to the initial position under the pressure of the spring after the foreign matters are discharged; when the rock is crushed under the normal working condition, the crushing force is generally smaller than the pre-pressure of the spring, so that the position of the impact plate is kept still, and the discharging granularity is ensured.

However, it has been found that during actual factory reaction plate adjustment and use, the hydraulic cylinder adjustment system has some drawbacks, such as the fact that the hydraulic cylinder joint is required to push the adjusting bracket to move by the pin shaft to compress the spring and then the adjusting nut is needed to achieve the adjustment, but during production, when the reaction plate enters a foreign matter, as described above, the hydraulic cylinder is in protective ejection, if the pin shaft is also connected at this time, the hydraulic cylinder rod is broken and stretched out, so that the hydraulic cylinder oil pipe and the valve are damaged, so that the pin shaft needs to be detached when the crusher is in material taking, and this leads to a problem that the hydraulic cylinder is hinged on the underframe through the middle swing shaft, at this time, the hydraulic cylinder can swing freely in the adjusting bracket, and when the reaction plate is in protective ejection and returns to the original position, the hydraulic cylinder is likely to swing to one side under the action of gravity and is interfered by the welding block at the pin shaft connecting position of the adjusting bracket, so that the hydraulic cylinder is damaged. As described above, a contradiction is formed, and in order to solve the contradiction, the original model adds a support at the lower part of the hydraulic cylinder, penetrates the pin shaft during adjustment, and removes the support (because the hydraulic cylinder slightly swings during adjustment and the support interfere with each other to damage the structure), so as to operate; when the belt materials are broken, the pin shafts are taken down, meanwhile, the support is installed, the hydraulic oil cylinder is controlled not to swing freely, and the hydraulic oil cylinder is not damaged when the protective rebound of the impact plate is ensured.

The scheme is feasible, but the process is found to be troublesome and complicated in the field operation, the support is not easy to disassemble and assemble, the field personnel can neglect the operation process easily, the pin shaft is forgotten to be disassembled when the material is carried, the support is forgotten to be installed, or the support is forgotten to be taken down when the material is regulated, and the damage accident and the economic loss are caused.

Disclosure of Invention

In order to solve the technical problems, the invention adopts the basic conception of the technical scheme that:

the top connector of the hydraulic cylinder for the medium crushing type impact crusher comprises a U-shaped connector frame and a threaded connector arranged at the bottom of the U-shaped connector frame; slide ways are arranged on two opposite side walls of the inner side of the connector frame, and slide blocks are arranged on the slide ways; the bottom of the sliding block is provided with an upper arc-shaped groove; the bottom of the inner side of the connector frame is provided with a lower arc-shaped groove opposite to the upper arc-shaped groove, the sliding block can slide down to the bottom of the connector frame along the sliding way, and the upper arc-shaped groove and the lower arc-shaped groove form a complete pin shaft hole.

As a preferable technical scheme, two upper inclined planes are symmetrically arranged at two sides of the upper arc-shaped groove; two sides of the lower arc-shaped groove are symmetrically provided with two lower inclined planes, and when the upper arc-shaped groove and the lower arc-shaped groove are clasped into a pin shaft hole, the upper inclined planes can be contacted and clung to the lower inclined planes so as to ensure that the pin shaft can be inserted into the pin shaft hole.

As a preferable technical scheme, a horizontal positioning hole which is vertical to the axial direction of the pin shaft hole is arranged in the sliding block, upper positioning holes with the same diameter as the horizontal positioning holes are arranged on two sides of the top of the joint frame, and the position where the upper positioning holes are is located is provided with a material level at the upper part; the two sides of the bottom of the joint frame are provided with lower positioning holes with the same diameter as the horizontal positioning holes, the position where the lower positioning holes are positioned is a lower overhaul position, and the lower positioning holes are arranged above the lower arc-shaped groove; when the slide block moves to the upper part with a material level, a pin shaft for positioning is inserted into the upper positioning hole and the horizontal positioning hole of the slide block; when the sliding block moves to the lower overhaul position, the pin shafts for positioning are inserted into the lower positioning holes and the horizontal positioning holes of the sliding block.

As the preferable technical scheme, when in adjustment, the sliding block is pushed to the overhaul position at the lower part of the joint frame, the upper arc-shaped groove and the lower arc-shaped groove are cohesive, the upper inclined surface and the lower inclined surface are tightly attached, the pin shaft is inserted into the lower positioning hole and the horizontal positioning hole of the sliding block, and the pin shaft of the hydraulic cylinder is inserted into the pin shaft hole after cohesive, so that the adjustment work can be performed; when the crusher is in belt material operation, the sliding block is pushed to the upper belt material level, and the pin shaft is inserted into the upper positioning hole and the horizontal positioning hole of the sliding block.

Compared with the prior art, the invention has the following beneficial effects:

the hydraulic cylinder top connector of the impact plate part ensures that the hydraulic cylinder of the crusher is protected to the greatest extent when the crusher is in material carrying, and ensures that operators can simply and rapidly switch the hydraulic cylinder connector between overhauling and material carrying positions, thereby reducing the downtime overhauling time and reducing the misoperation probability.

The following describes the embodiments of the present invention in further detail with reference to the accompanying drawings.

Drawings

In the drawings:

FIG. 1 is a schematic view of the overall structure of a medium crushing impact crusher according to the prior art;

FIG. 2 is a schematic view of the overall structure of the medium crushing impact crusher of the present invention;

FIG. 3 is a schematic view of the overall structure of the impact plate portion of the present invention;

FIG. 4 is a schematic view of the overall structure of the first adjusting and protecting device of the present invention;

FIG. 5 is a schematic view of the suspension screw assembly of the present invention;

FIG. 6 is a schematic view of the spring screw assembly of the present invention;

FIG. 7 is a first adjustment protection device of the present invention in a pre-adjustment state;

FIG. 8 is a view subsequent to FIG. 7, showing the outboard compression nut and the first boot being unscrewed to the strike plate side;

FIG. 9 is a schematic view of the hydraulic ram lifting and contacting the outboard compression nut subsequent to FIG. 8;

FIG. 10 is a schematic view of the inboard compression nut lifted and in contact with the adjustment bracket subsequent to FIG. 9;

FIG. 11 is a schematic view of the hydraulic ram retracted to the home position subsequent to FIG. 10;

FIG. 12 is a schematic view of the installation of the top sub of the present invention;

FIG. 13 is a schematic view of the structure of the top sub of the present invention;

FIG. 14 is a schematic view of a slider in a top sub of the present invention in a lower service position;

fig. 15 is a schematic view of the slider in the top sub of the present invention with a level at the top.

In the figure: 1. a rotor;

2. a striking plate portion; 21. countering the plate body; 22. a first adjustment protection device; 22-1, a chassis; 22-2, a suspension screw assembly; 22-21, U-shaped connecting plates; 22-22, a first lock nut; 22-23, anti-loose gaskets; 22-24, an inner side compression nut; 22-25, an outer compression nut; 22-26, a damping disc spring; 22-27, a first sheath; 22-28, top end nut; 22-29, hanging a screw; 22-3, an adjusting frame; 22-4, a spring screw assembly; 22-41, spring screw; 22-42, a second lock nut; 22-43, a second sheath; 22-44, a pressing plate; 22-45, springs; 22-46, pressing the cap; 22-5, adjusting the hydraulic cylinder by the impact plate; 22-51, an impact plate adjusts a hydraulic cylinder connector frame; 22-51-1, a slideway; 22-51-2, lower arc-shaped groove; 22-51-3, lower inclined plane; 22-52, a threaded joint; 22-54, a sliding block; 22-54-1, an upper arc groove; 22-54-2, upper inclined plane; 22-54-3, horizontal positioning holes; 22-51-4, upper positioning holes; 22-51-5, lower positioning holes; 22-512, pin shafts; 23. countering the plate lining plate;

3. a leveling plate part; 4. a housing.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and the following embodiments are used to illustrate the present invention.

As shown in fig. 2, a medium crushing type impact crusher for medium hard rock comprises a rotor 1, an impact plate part 2, a leveling plate part 3 and a shell 4.

As shown in fig. 3 to 5, the striking plate portion 2 includes a striking plate main body 21 and a striking plate portion adjustment protection device 22; the structure of the impact plate part 2 is kept unchanged on the basis of the prior art, and the innovation of the impact plate part adjusting and protecting device 22 is as follows: the impact plate part adjusting and protecting device 22 comprises a bottom frame 22-1 which is horizontally arranged, vertical suspension screw rod assemblies 22-2 which are arranged on two sides of the bottom frame 22-1, an adjusting frame 22-3 which is arranged between the two suspension screw rod assemblies 22-2, a spring screw rod assembly 22-4 and an impact plate adjusting hydraulic cylinder 22-5; the underframe 22-1 is connected with the shell 4; the suspension screw rod assembly 22-2 comprises a U-shaped connecting plate 22-21 connected with the impact plate main body 21 through a pin shaft, wherein the suspension screw rod 22-29 is connected above the U-shaped connecting plate 22-21 through a first locking nut 22-22, and a locking gasket 22-23 is arranged between the first locking nut 22-22 and the U-shaped connecting plate 22-21; one end of the suspension screw 22-29 far away from the U-shaped connecting plate 22-21 is clamped on the adjusting frame 22-3 through an inner side compression nut 22-24 and an outer side compression nut 22-25, the inner side compression nut 22-24 is pressed on the underframe 22-1 through a damping disc spring 22-26, a first sheath 22-27 which is in threaded connection with the outside of the suspension screw 22-29 is arranged above the outer side compression nut 22-25, and a top end nut 22-28 which is in threaded connection with the suspension screw 22-29 is arranged at the top of the first sheath 22-27. The suspension screw assembly 22-2 pulls the impact plate body 21, and is suspended on the housing 4 by the chassis 22-1 so that the impact plate body 21 does not fall down.

As shown in FIG. 6, the spring screw assembly 22-4 comprises a spring screw 22-41 penetrating through the underframe 22-1 and the adjusting frame 22-3, the spring screw 22-41 is connected with the underframe 22-1 through a second locking nut 22-42 so as to be fixed inside the shell 4, a pressing plate 22-44 is arranged at the top of the spring screw 22-41, a pressing cap 22-46 and a second sheath 22-43 which are connected with the outer side of the spring screw 22-41 in a threaded manner are sequentially arranged above the pressing plate 22-44, a spring 22-45 is sleeved on the spring screw 22-41 between the pressing plate 22-44 and the adjusting frame 22-3, the pressing plate 22-44 presses the spring 22-45 through the pressing 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 pretightening force which is suitable for normal crushing force, so that the whole impact plate main body 21 cannot swing backwards when being subjected to normal crushing force.

The number of the impact plate adjusting hydraulic cylinders 22-5 is two, the impact plate adjusting hydraulic cylinders 22-5 are symmetrically arranged between the two suspension screw assemblies 22-2, the cylinder body of the impact plate adjusting hydraulic cylinders 22-5 is hinged on the underframe 22-1, the joint at the top of the cylinder rod is connected with the adjusting frame 22-3 through a pin shaft, and the hydraulic cylinders 22-5 are used for adjusting the distance between the impact plate main body 21 and the rotor 1.

In summary, the suspension screw assembly 22-2 is changed from an adjustment function to a suspension function only, and the adjustment function is performed by the adjustment hydraulic ram 22-5, relative to the original configuration. As shown in fig. 7 to 11, the adjusting principle of the impact plate adjusting and protecting device 22 is as follows: when the distance between the impact plate part 2 and the rotor 1 is adjusted to be small, the outer side compression nut 22-25 and the first sheath 22-27 are screwed out to the outer side to be adjusted to a distance, then the cylinder rod of the hydraulic cylinder 22-5 drives the adjusting frame 22-3 to push out to the same side until the adjusting frame 22-3 is contacted with the outer compression nut, then the inner side locking nut is screwed out to the side of the impact plate part 2 until the inner side locking nut contacts with the adjusting frame 22-3 again, and finally the cylinder body of the hydraulic cylinder 22-5 drives the adjusting frame 22-3 to retract, so that the suspension screw assembly 22-2 drives the impact plate 2 to move to the rotor 1 side, and the distance between the impact plate 2 and the rotor 1 is reduced; when the distance between the striking plate portion 2 and the rotor 1 is adjusted to be large, the adjusting bracket 22-3 is first ejected to the distance to be adjusted by the hydraulic cylinder 22-5, then the inner lock nut 22-24 is screwed to the rotor 1 side to be in contact with the housing 4, the hydraulic cylinder 22-5 is retracted to the original position to the rotor 1 side so that the inner lock nut is in contact with the bottom frame 22-1, and finally the outer lock nut and the first sheath 22-27 are screwed to the rotor 1 side.

The spring screw 22-41 of the spring screw assembly 22-4 is attached to the housing 4, and the spring 22-45 is pressed against the adjustment frame 22-3 by the pressing cap 22-46 and the pressing plate 22-44, thereby holding the reaction plate 2 in place as a whole by pressing the adjustment frame 22-3. During normal production, the impact force of the material on the impact plate main body 21 is smaller than the pre-pressure of the springs 22-45, and the impact plate main body 21 is kept motionless; when the crusher enters into the foreign matters difficult to crush or is overloaded, the foreign matters and materials can be hit to the impact plate main body 21, strong impact is caused on the foreign matters and materials, when the impact force is larger than the pre-compression force set by the springs 22-45, the springs 22-45 can be compressed, so that the impact plate main body 21 moves backwards, the gap between the impact plate and the rotor 1 is increased, the foreign matters or the overloaded materials are partially discharged, at the moment, the pressure of the impact plate main body 21 is reduced, and the springs 22-45 press the impact plate main body 21 back to the original position, so that the protection of the structural integrity of the impact plate and the crusher is realized. The structure adopts a hydraulic structure to replace a mechanical mode for adjustment, greatly increases the adjusting force and the adjusting speed, is simple to operate, greatly reduces the shutdown maintenance time and improves the production efficiency of factories.

The adjustment of the impact plate adjusting hydraulic cylinder 22-5 is realized by pushing the adjusting frame 22-3 to move through a pin shaft by the top joint of the cylinder rod of the hydraulic cylinder 22-5 to compress the spring 22-45 and then adjusting the nut. But at the time of production, as described above, when the space of the impact plate 2 is in foreign matter, the protective pop-up will be immediately performed, and if the pin is still connected to the top joint (standard self-contained joint) of the hydraulic cylinder 22-5, the cylinder rod will be forced to extend, resulting in damage to the oil pipe and valve of the hydraulic cylinder 22-5, so that the pin needs to be detached when the crusher is in charge, which may lead to a problem that the hydraulic cylinder 22-5 is hinged to the bottom frame 22-1 through the intermediate swing shaft, and at this time, the hydraulic cylinder 22-5 may swing freely in the adjusting frame 22-3, and when the impact plate is in protective pop-up and returns to the original position, the hydraulic cylinder 22-5 is likely to swing to one side under the action of gravity, and is interfered by the welding block at the pin connection position of the adjusting frame 22-3, thereby being damaged. In order to solve the problem, the invention also innovates the top joint of the hydraulic cylinder 22-5 cylinder rod.

Specifically, as shown in fig. 12 to 13, the top joint includes a U-shaped joint frame 22-51 and a threaded joint 22-52 provided at the bottom thereof, the threaded joint 22-52 and the original joint of the corresponding hydraulic cylinder 22-5 being identical in specification so as to be connected to the cylinder rod in place of the original joint; the two opposite side walls of the inner side of the connector frame are provided with slide ways 22-51-2, and the slide ways 22-51-2 are provided with slide blocks 22-54, so that the slide blocks 22-54 can flexibly move on the connector frame; the bottom of the sliding block 22-54 is provided with an upper arc-shaped groove 22-54-1; the bottom of the inner side of the joint frame is provided with a lower arc-shaped groove 22-51-2 opposite to the upper arc-shaped groove 22-54-1, so that the sliding block 22-54 can slide down to the bottom of the joint frame along the sliding way 22-51-2 until the upper arc-shaped groove 22-54-1 and the lower arc-shaped groove 22-51-2 form a complete pin shaft hole; two upper inclined planes 22-54-2 are symmetrically arranged at two sides of the upper arc-shaped groove 22-54-1; two lower inclined planes 22-51-3 are symmetrically arranged on two sides of the lower arc-shaped groove 22-51-2, and when the upper arc-shaped groove 22-54-1 and the lower arc-shaped groove 22-51-2 are clasped to form a pin shaft hole, the upper inclined plane 22-54-2 can be contacted and clung to the lower inclined plane 22-51-3 so as to ensure that a pin shaft can be inserted into the pin shaft hole; in addition, a horizontal positioning hole 22-54-3 which is vertical to the axial direction of the pin shaft hole is arranged in the sliding block 22-54, two sides of the top of the joint frame 22-51 are provided with upper positioning holes 22-51-4 with the same diameter as the horizontal positioning holes 22-54-3, and the upper positioning holes 22-51-4 are provided with material levels; the two sides of the bottom of the joint frame are provided with lower positioning holes 22-51-5 with the same diameter as the horizontal positioning holes 22-54-3, the lower positioning holes 22-51-5 are positioned at the adjustment overhaul positions, and the lower positioning holes 22-51-5 are arranged above the lower arc-shaped grooves 22-51-2. The upper positioning holes 22-51-4, the lower positioning holes 22-51-5 and the positioning holes of the sliding block 22-54 are used for installing the pin shaft 22-512 when the sliding block 22-54 is positioned at the upper and lower positions, so that the sliding block 22-54 is firmly positioned at the two positions.

As shown in fig. 14 to 15, during adjustment, the sliding block 22-54 is pushed to a maintenance position at the lower part of the joint frame, the upper arc-shaped groove 22-54-1 and the lower arc-shaped groove 22-51-2 are clasped, the upper inclined surface 22-54-2 and the lower inclined surface 22-51-3 are tightly attached, the pin shaft 22-512 is inserted into the lower positioning hole 22-51-5 and the positioning hole of the sliding block 22-54, and the pin shaft of the hydraulic cylinder 22-5 is inserted into the clasped pin shaft hole, so that adjustment work can be performed; when the crusher is in belt running, the sliding block 22-54 is pushed to the upper belt material level, the pin shaft 22-512 is inserted into the upper positioning hole 22-51-4 and the positioning hole of the sliding block 22-54, the pin shaft of the hydraulic oil cylinder 22-5 does not need to be taken out from the lower arc-shaped groove 22-51-2, so that when the impact plate is in protective rebound, the upper part of the pin shaft of the hydraulic oil cylinder 22-5 can move without being blocked (the specific length is calculated by the actual demand), the cylinder rod of the hydraulic oil cylinder 22-5 can not be forced to extend, and meanwhile, the middle swing shaft of the hydraulic oil cylinder 22-5 is swung on the underframe 22-1 in a proper manner when the impact plate 2 is in rebound, and the interference of a top joint when the adjusting frame 22-3 is in back pressure can not be caused; and the lower inclined surface 22-51-3 at the bottom of the connector frame enables the pin shaft of the hydraulic cylinder 22-5 to be compliant to enter the lower arc-shaped groove 22-51-2 when foreign matters are pressed back through the rear impact plate 2, so that the foreign matters cannot be blocked. The hydraulic cylinder 22-5 is protected to the greatest extent during material carrying operation, the process is very simple and convenient, and the sliding blocks 22-54 are only required to be adjusted between overhauling and material carrying positions according to field requirements, so that an operator cannot forget to occur.

The foregoing describes the embodiments of the present invention in detail, but the description is only a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. All equivalent changes and modifications within the scope of the present invention are intended to be covered by the present invention.

Claims (4)

1. A hydraulic cylinder top connects for well garrulous formula reaction crusher, its characterized in that: the top joint comprises a U-shaped joint frame and a threaded joint arranged at the bottom of the U-shaped joint frame; slide ways are arranged on two opposite side walls of the inner side of the connector frame, and slide blocks are arranged on the slide ways; the bottom of the sliding block is provided with an upper arc-shaped groove; the bottom of the inner side of the connector frame is provided with a lower arc-shaped groove opposite to the upper arc-shaped groove, the sliding block can slide down to the bottom of the connector frame along the sliding way, and the upper arc-shaped groove and the lower arc-shaped groove form a complete pin shaft hole.

2. The hydraulic ram top joint for a medium crushing impact crusher of claim 1, wherein: two upper inclined planes are symmetrically arranged at two sides of the upper arc-shaped groove; two sides of the lower arc-shaped groove are symmetrically provided with two lower inclined planes, and when the upper arc-shaped groove and the lower arc-shaped groove are clasped into a pin shaft hole, the upper inclined planes can be contacted and clung to the lower inclined planes so as to ensure that the pin shaft can be inserted into the pin shaft hole.

3. The hydraulic ram top joint for a medium crushing impact crusher of claim 2, wherein: a horizontal positioning hole which is axially perpendicular to the pin shaft hole is formed in the sliding block, upper positioning holes with the same diameter as the horizontal positioning holes are formed in two sides of the top of the joint frame, and the upper part of each upper positioning hole is provided with a material level; the two sides of the bottom of the joint frame are provided with lower positioning holes with the same diameter as the horizontal positioning holes, the position where the lower positioning holes are positioned is a lower overhaul position, and the lower positioning holes are arranged above the lower arc-shaped groove; when the slide block moves to the upper part with a material level, a pin shaft for positioning is inserted into the upper positioning hole and the horizontal positioning hole of the slide block; when the sliding block moves to the lower overhaul position, the pin shafts for positioning are inserted into the lower positioning holes and the horizontal positioning holes of the sliding block.

4. A method of operating a hydraulic ram top joint for a medium crushing impact crusher as claimed in claim 3, wherein: during adjustment, the sliding block is pushed to an overhaul position at the lower part of the joint frame, the upper arc-shaped groove and the lower arc-shaped groove are cohesive, the upper inclined surface and the lower inclined surface are tightly attached, a pin shaft is inserted into the lower positioning hole and the horizontal positioning hole of the sliding block, and a hydraulic cylinder pin shaft is inserted into the cohesive pin shaft hole, so that adjustment work can be performed; when the crusher is in belt material operation, the sliding block is pushed to the upper belt material level, and the pin shaft is inserted into the upper positioning hole and the horizontal positioning hole of the sliding block.

Images