An impact plate for a medium impact crusher

Abstract

The present invention, and the technical field of crushers, specifically relates to an impact plate for a medium-sized impact crusher, comprising an impact plate body and a first adjustment and protection device. The first adjustment and protection device comprises a base frame, vertical suspension screw assemblies arranged on both sides of the base frame, an adjustment frame, a spring screw assembly, and a hydraulic cylinder. One end of the suspension screw assembly is connected to the housing, and the other end is used to hold the impact plate body. The spring screw assembly is connected to the housing and uses elastic force to maintain the impact plate in place when impacted. The base frame is connected to the interior of the housing. The adjustment frame is connected to the vertical suspension screw assembly, the spring screw assembly, and the hydraulic cylinder on the other side. When the first adjustment and protection device is in operation, the adjustment frame moves due to the extension and contraction of the hydraulic cylinder, thereby driving the movement of the suspension screw assembly, thereby changing the spacing between the impact plate and the rotor. The hydraulic first adjustment and protection device of the impact plate body significantly reduces the time and difficulty of maintenance and adjustment.

Description

Technical Field

[0001] The present invention relates to the technical field of crushers, in particular to an impact plate part used for a medium-crushing impact crusher. Background Art

[0002] The medium impact crusher is a very important and commonly used crusher in the fields of cement, sand and gravel aggregates and other non-metallic mining industries. 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 less than 30mm, so as to meet the finished product particle size and output requirements of mining production.

[0003] like Figure 1 As shown in the figure, the existing general-purpose crusher generally consists of a rotor 1, two impact plates 2, a leveling plate 3, and a housing 4. The specific principle and process are as follows: the material enters the crusher, is struck by the rotor, is thrown to the impact plate, and rebounds back, and is struck by the rotor again. After repeated action by the two impact plates, the material reaches a certain particle size requirement and is then carried by the rotor to the leveling plate. The leveling plate is one of the important components of the crusher. Its function is to crush and shape the above-mentioned material for the final time to achieve the required particle size and then shape it so that it meets the requirements in terms of both particle size and particle shape.

[0004] However, the current counterattack board has the following problems:

[0005] The adjustment and protection devices on the two impact plates have two functions: first, they allow the impact plates to rebound and avoid foreign objects that are too difficult to crush, thereby protecting the impact plate structure from damage; second, they adjust the position of the impact plates to change the distance between the impact plate discharge port and the rotor to adjust the discharge particle size or compensate for wear on wear-resistant parts. Existing models use a mechanical adjustment method, relying on screws on both sides to adjust the thread. This method is extremely slow during adjustment. If there is slight deformation of the screw, thread wear, slight deformation of the frame, or impurities stuck in the threads, the adjustment force required is very large, and sometimes even adjustment is impossible. This creates great difficulties for on-site operation and maintenance, increases time and costs, reduces production efficiency, and affects normal production order. Summary of the Invention

[0006] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0007] An impact plate portion for a medium-sized impact crusher includes an impact plate body and a first adjustment and protection device; the first adjustment and protection device includes a horizontally arranged base frame, vertical suspension screw assemblies arranged on both sides of the base frame, an adjustment frame arranged between the two suspension screw assemblies, a spring screw assembly, and an impact plate adjustment hydraulic cylinder;

[0008] One end of the suspension screw assembly is connected to the housing, and the other end is used to pull the impact plate body;

[0009] The spring screw assembly is connected to the housing and utilizes elastic force to keep the impact plate portion in place when impacted;

[0010] The chassis is connected to the housing and serves as a fixed support component, connecting the suspension screw, the assembly spring screw assembly, and the impact plate adjustment hydraulic cylinder into one; when the first adjustment protection device is working, the position of the chassis does not move with the change of the distance between the impact plate and the rotor;

[0011] The adjustment frame is connected to the suspension screw assembly, the spring screw assembly and the impact plate adjustment hydraulic cylinder on the other side; when the first adjustment protection device is working, the adjustment frame is displaced under the extension and contraction of the impact plate adjustment hydraulic cylinder, thereby driving the movement of the suspension screw assembly, and then changing the distance between the impact plate and the rotor.

[0012] As an optimal technical solution, the suspension screw assembly includes a U-shaped connecting plate connected to the impact plate body, and the suspension screw is connected to the top of the U-shaped connecting plate through a first locking nut; the end of the suspension screw away from the U-shaped connecting plate is clamped on the adjustment frame through an inner clamping nut and an outer clamping nut, and the inner clamping nut is pressed on the base frame through a shock-absorbing disc spring, and a first sheath threadedly connected to the outside of the suspension screw is provided above the outer clamping nut, and a top nut threadedly connected to the suspension screw is provided on the top of the first sheath.

[0013] As an optimal technical solution, the working method of the suspension screw assembly includes the following steps: when the gap between the impact plate and the rotor is adjusted to be smaller, the outer clamping nut and the first sleeve are first screwed out to the side of the impact plate to the distance to be adjusted, and then the cylinder rod of the impact plate adjusting hydraulic oil cylinder drives the adjusting frame to be pushed out in the same direction until the adjusting frame and the outer clamping nut are contacted, and then the inner clamping nut is screwed out to the side of the impact plate until it contacts the adjusting frame again, and finally the cylinder body of the impact plate adjusting hydraulic oil cylinder drives the adjusting frame to retract outward, so that the suspension screw drives the impact plate to move toward the rotor side, thereby reducing the gap between the impact plate and the rotor; when the gap between the impact plate and the rotor is adjusted to be larger, the adjusting frame is first pushed out to the distance to be adjusted by the impact plate adjusting hydraulic oil cylinder, and then the inner clamping nut is screwed toward the rotor side until it contacts the shell, and the impact plate adjusting hydraulic oil cylinder is retracted to the original position toward the rotor side, so that the inner clamping nut contacts the base frame, and finally the outer clamping nut and the first sleeve are tightened toward the rotor side.

[0014] As a preferred technical solution, the spring screw assembly includes a spring screw that passes through the base frame and the adjusting frame. The spring screw is fixed to the base frame through a second locking nut and then fixed to the inside of the shell. A pressure plate is provided on the top of the spring screw, and a pressure cap and a second sheath that are threadedly connected to the spring screw are provided above the pressure plate in sequence. A spring is sleeved on the spring screw between the pressure plate and the adjusting frame. The pressure plate presses one end of the spring through the pressure cap, and the other end of the spring presses the adjusting frame onto the shell.

[0015] As an optimal technical solution, the following steps are included: during normal production, the impact force generated by the material on the impact plate body is less than the spring pre-compression force, and the impact plate body remains stationary; when the crusher enters with difficult-to-crush foreign objects or is overloaded, the foreign objects and materials will be hit against the impact plate body, causing a strong impact on it. When the impact force is greater than the set pre-compression force of the spring, the spring will be compressed, causing the impact plate body to move backward, and the gap between the impact plate body and the rotor will increase, partially discharging the foreign objects or overloaded materials. At this time, the pressure on the impact plate body is reduced, and the spring presses the impact plate body back to its original position.

[0016] As an optimal technical solution, there are two impact plate adjusting hydraulic cylinders, which are symmetrically arranged between the two suspension screw assemblies. The cylinder body of the impact plate adjusting hydraulic cylinder is hinged on the base frame, and the top joint of the cylinder rod is connected to the adjustment frame.

[0017] As a preferred technical solution, the top joint includes a U-shaped joint frame and a threaded joint provided at its bottom; the two opposite inner walls of the U-shaped joint frame are provided with slides, and a slider is provided on the slide; an upper arc groove is provided at the bottom of the slider; a lower arc groove opposite to the upper arc groove is provided at the bottom of the inner side of the U-shaped joint frame, and the slider can slide down along the slide to the bottom of the U-shaped joint frame, and the upper arc groove and the lower arc groove form a complete pin shaft hole.

[0018] 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 hydraulic cylinder pin shaft can be inserted into the pin shaft hole.

[0019] As an optimal technical solution, a horizontal positioning hole axially perpendicular to 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 U-shaped joint frame, and the upper positioning holes are located at 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 U-shaped 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 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.

[0020] As an optimal technical solution, when adjusting, push the slider to the lower maintenance position of the U-shaped 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, insert the pin into the upper positioning hole and the horizontal positioning hole of the slider, and the hydraulic cylinder pin does not need to be taken out of the lower arc groove.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The first adjustment and protection device on the impact plate of this invention improves upon the existing adjustment and suspension functions to a suspension function only, with the adjustment function being performed by the hydraulic cylinder. The hydraulic impact plate adjustment mechanism significantly reduces the time and difficulty of maintenance and adjustment. The top joint of the impact plate's hydraulic cylinder ensures maximum protection for the hydraulic cylinder when the crusher is carrying material, and allows the operator to easily and quickly switch the hydraulic cylinder joint between maintenance and carrying material positions, minimizing downtime for maintenance and reducing the probability of misoperation.

[0023] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In the attached figure:

[0025] Figure 1 It is a schematic diagram of the overall structure of a medium-crushing impact crusher in the prior art;

[0026] Figure 2 Schematic diagram of the overall structure of the medium-crushing impact crusher of the present invention;

[0027] Figure 3 This is a schematic diagram of the overall structure of the counterattack plate portion of the present invention;

[0028] Figure 4 Schematic diagram of the overall structure of the first regulating and protecting device of the present invention;

[0029] Figure 5 This is a schematic structural diagram of the suspension screw assembly of the present invention;

[0030] Figure 6 This is a schematic structural diagram of a spring screw assembly according to the present invention;

[0031] Figure 7 The first adjustment protection device of the present invention is in a state before adjustment;

[0032] Figure 8 To continue Figure 7 Afterwards, the outer compression nut and the first sheath are screwed out toward the impact plate side;

[0033] Figure 9 To continue Figure 8 Later, the hydraulic cylinder is lifted and contacts the outer compression nut;

[0034] Figure 10 To continue Figure 9 Later, the inner compression nut is lifted and contacts the adjustment frame;

[0035] Figure 11 For the continuation Figure 10 Later, the hydraulic cylinder is retracted to its original position;

[0036] Figure 12 This is a schematic diagram of the installation of the top joint of the present invention;

[0037] Figure 13 Schematic diagram of the structure of the top joint of the present invention;

[0038] Figure 14 A schematic diagram of a slider in a top joint of the present invention in a lower maintenance position;

[0039] Figure 15 This is a schematic diagram of the slider in the top joint of the present invention with the material level at the top.

[0040] In the figure: 1. rotor;

[0041] 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 washer; 22-24. Inner compression nut; 22-25. Outer compression 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 Rod 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 U-shaped joint bracket; 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; 22-51-4, upper positioning hole; 22-51-5, lower positioning hole; 22-512, pin; 23, impact plate liner;

[0042] 3. Leveling the plate; 4. Shell. DETAILED DESCRIPTION

[0043] 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.

[0044] 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.

[0045] like Figures 3 to 5 As shown, the counterattack plate portion 2 includes a counterattack plate body 21 and a counterattack plate portion adjustment and protection device 22; the structure of the counterattack plate portion 2 remains unchanged on the basis of the existing technology, and the innovation of the counterattack plate portion adjustment and protection device 22 is as follows: the counterattack plate portion adjustment and protection device 22 includes a horizontally arranged base frame 22-1, vertical suspension screw rod assemblies 22-2 arranged on both sides of the base frame 22-1, an adjustment frame 22-3 arranged between the two suspension screw assemblies 22-2, a spring screw assembly 22-4 and a counterattack plate adjustment hydraulic cylinder 22-5; the base frame 22-1 is connected to the housing 4; the suspension screw assembly 22-2 includes a U-shaped connecting plate 22-21 connected to the counterattack plate body 21 through a pin shaft, and the U-shaped connecting plate 22-2 1 is connected to a suspension screw 22-29 via a first locking nut 22-22. A locking washer 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 to the adjustment frame 22-3 via an inner compression nut 22-24 and an outer compression nut 22-25. The inner compression nut 22-24 is pressed against the base frame 22-1 via a damping disc spring 22-26. A first sleeve 22-27 is provided above the outer compression nut 22-25 and is threadedly connected to the outside of the suspension screw 22-29. A top nut 22-28 is provided at the top of the first sleeve 22-27 and is threadedly connected to the suspension screw 22-29. The suspension screw assembly 22-2 holds the impact plate body 21 in place and suspends it from the housing 4 via the base frame 22-1, preventing the impact plate body 21 from falling.

[0046] like Figure 6As 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 by a second locking nut 22-42 so as to be fixed to the inside of 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. 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 normal crushing force.

[0047] There are two impact plate adjustment hydraulic cylinders 22-5, which are symmetrically arranged between the two suspension screw assemblies 22-2. The impact plate adjustment hydraulic cylinder 22-5 cylinder body 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.

[0048] In short, compared with the original structure, the suspension screw assembly 22-2 has a suspension function instead of adjustment and suspension, 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 a smaller distance, the outer clamping nut 22-25 and the first sleeve 22-27 are first screwed outward to the side to be adjusted to the distance, 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 clamping 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 portion to move toward the rotor 1 side, thereby reducing the distance between the impact plate portion and the rotor 1; when increasing the distance between the impact plate portion 2 and the rotor 1, first use the hydraulic cylinder 22-5 to push the adjustment frame 22-3 out to the distance to be adjusted, then screw the inner clamping nut 22-24 toward the rotor 1 side until it contacts the housing 4, retract the hydraulic cylinder 22-5 toward the rotor 1 side to its original position, so that the inner clamping nut contacts the base frame 22-1, and finally tighten the outer clamping nut and the first sleeve 22-27 toward the rotor 1 side.

[0049] The spring screw 22-41 of the spring screw assembly 22-4 is connected to the housing 4. The spring 22-45 is pressed against the adjustment frame 22-3 by the pressure cap 22-46 and the pressure plate 22-44, thereby holding the impact plate 2 in place. During normal production, the impact force exerted by the material on the impact plate body 21 is less than the spring preload, and the impact plate body 21 remains stationary. However, when the crusher encounters difficult-to-crush foreign objects or is overloaded, the foreign objects and materials are struck against the impact plate body 21, causing a strong impact. When the impact force exceeds the set preload of the spring 22-45, the spring 22-45 compresses, causing the impact plate body 21 to move backward. This increases the gap between the impact plate body and the rotor 1, partially expelling the foreign objects or overloaded materials. At this time, the pressure on the impact plate body 21 decreases, and the spring 22-45 presses the impact plate body 21 back into place, thus protecting the impact plate and the entire crusher structure. 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 reducing downtime and maintenance time, and improving the factory's production efficiency.

[0050] The impact plate adjustment hydraulic cylinder 22-5 is adjusted by the top joint of the hydraulic cylinder 22-5 rod, which pushes the adjustment frame 22-3 via a pin, compressing the spring 22-45, and then adjusting the nut. However, during production, as mentioned above, when a foreign object enters the space between the impact plate 2 and the impact plate 2, it will immediately eject in a protective manner. If the top joint of the hydraulic cylinder 22-5 (a standard built-in joint) is still connected to the pin at this time, the rod will be forced to extend, causing 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 material. However, this leads to another problem. The hydraulic cylinder 22-5 is hinged to the base frame 22-1 via an intermediate swing shaft. At this time, the hydraulic cylinder 22-5 may swing freely within the adjustment frame 22-3. When the impact plate protectively ejects and returns to its original position, the hydraulic cylinder 22-5 is likely to swing to one side under the action of gravity, and interfere with the welding block at the pin connection of the adjustment frame 22-3, thus causing damage. In order to solve this problem, the present invention also innovates the top joint of the hydraulic cylinder 22-5 cylinder rod.

[0051] Specifically, such as Figures 12 to 13As shown, 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 is consistent with the original joint specification of the corresponding hydraulic cylinder 22-5, so as to replace the original joint to connect the cylinder rod; the two opposite walls on the inner side of the U-shaped joint frame are provided with slideways 22-51-2, and the slideways 22-51-2 are provided with sliders 22-54, so that the sliders 22-54 can move flexibly on the U-shaped joint frame; the sliders 22 -54 is provided with an upper arc groove 22-54-1 at the bottom; a lower arc groove 22-51-2 is provided on the inner bottom of the U-shaped joint frame opposite to the upper arc groove 22-54-1, so that the slider 22-54 can slide down along the slide 22-51-2 to the bottom of the U-shaped 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 22-5 are symmetrically provided on both sides of the upper arc groove 22-54-1. 4-2; Two lower inclined surfaces 22-51-3 are symmetrically provided 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 hole can be inserted into the pin; 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. U-shaped joint Upper positioning holes 22-51-4 of the same diameter as the horizontal positioning holes 22-54-3 are provided on both sides of the top of the frame 22-51. The upper positioning holes 22-51-4 are located at the material level. Lower positioning holes 22-51-5 of the same diameter as the horizontal positioning holes 22-54-3 are provided on both sides of the bottom of the U-shaped joint frame. The lower positioning holes 22-51-5 are located at the adjustment and maintenance level. The lower positioning holes 22-51-5 are located above the lower arc-shaped groove 22-51-2. The upper positioning holes 22-51-4, the lower positioning holes 22-51-5, and the positioning holes of the slider 22-54 are used to install the pin 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.

[0052] like Figures 14 to 15As shown, when adjusting, push the slider 22-54 to the lower maintenance position of the U-shaped joint frame, hug 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 22-51-5 and the positioning hole of the slider 22-54, and insert the pin of the hydraulic cylinder 22-5 into the pin hole after hugging. At this time, the adjustment work can be carried out; when the crusher is running with material, push the slider 22-54 to the upper material position, insert the pin 22-512 into the upper positioning hole 22-51-4 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 removed from the lower arcuate groove 22-51-2. This allows the upper portion of the pin of hydraulic cylinder 22-5 to move unimpeded during the protective rebound of the impact plate 2 (the specific length is calculated based on actual requirements), preventing the rod of hydraulic cylinder 22-5 from being forced to extend. Furthermore, as the impact plate 2 rebounds, the center swing axis of hydraulic cylinder 22-5 smoothly swings on the base frame 22-1, preventing interference with the top joint during the return pressure of the adjustment frame 22-3. Furthermore, the lower slope 22-51-3 at the bottom of the U-shaped joint frame allows the pin of hydraulic cylinder 22-5 to smoothly enter the lower arcuate groove 22-51-2 during the return pressure of the impact plate 2 after a foreign object passes through, preventing it from getting stuck. This maximizes the protection of hydraulic cylinder 22-5 during material handling. Furthermore, the above process is very simple: simply adjust the slider 22-54 between inspection and material handling as needed, eliminating the risk of operator forgetfulness.

[0053] The embodiments of the present invention are described in detail above, but the contents described are only preferred embodiments of the present invention and should not be considered to limit the scope 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. An impact plate for a medium-sized impact crusher, comprising an impact plate body and a first adjustment and protection device; characterized in that: The first adjustment and protection device includes a horizontally arranged base frame, vertical suspension screw assemblies arranged on both sides of the base frame, an adjustment frame arranged between the two suspension screw assemblies, a spring screw assembly and a counterattack plate adjustment hydraulic cylinder; One end of the suspension screw assembly is connected to the housing, and the other end is used to pull the impact plate body; The spring screw assembly is connected to the housing and utilizes elastic force to keep the impact plate portion in place when impacted; The chassis is connected to the housing and serves as a fixed support component, connecting the suspension screw assembly, the spring screw assembly, and the impact plate adjustment hydraulic cylinder into one. When the first adjustment protection device is in operation, the position of the chassis does not move with the change in the distance between the impact plate and the rotor. The adjustment frame is connected to the suspension screw assembly, the spring screw assembly and the impact plate adjustment hydraulic cylinder on the other side; when the first adjustment protection device is working, the adjustment frame is displaced by the extension and contraction of the impact plate adjustment hydraulic cylinder, thereby driving the movement of the suspension screw assembly, and then changing the distance between the impact plate and the rotor; There are two hydraulic cylinders for adjusting the impact plate, which are symmetrically arranged between the two suspension screw assemblies. The cylinder bodies of the hydraulic cylinders for adjusting the impact plate are hinged on the base frame, and the top joints of the cylinder rods are connected to the adjustment frame. The top joint includes a U-shaped joint frame and a threaded joint provided at its bottom; slideways are provided on the two opposite inner walls of the U-shaped joint frame, and a slider is provided on the slideway; an upper arc-shaped groove is provided at the bottom of the slider; a lower arc-shaped groove opposite to the upper arc-shaped groove is provided at the bottom of the inner side of the U-shaped joint frame, and the slider can slide down along the slideway to the bottom of the U-shaped joint frame, and the upper arc-shaped groove and the lower arc-shaped groove form a complete pin shaft hole.

2. The impact plate portion for a medium impact crusher according to claim 1, characterized in that: The suspension screw assembly includes a U-shaped connecting plate connected to the impact plate body, and the suspension screw is connected to the top of the U-shaped connecting plate through a first locking nut; the end of the suspension screw away from the U-shaped connecting plate is clamped on the adjustment frame through an inner clamping nut and an outer clamping nut, and the inner clamping nut is pressed on the base frame through a shock-absorbing disc spring, and a first sheath threadedly connected to the outside of the suspension screw is provided above the outer clamping nut, and a top nut threadedly connected to the suspension screw is provided on the top of the first sheath.

3. The impact plate portion for a medium impact crusher according to claim 2, characterized in that: The working method of the suspension screw assembly includes the following steps: when the spacing between the impact plate and the rotor is adjusted to be smaller, the outer tightening nut and the first sleeve are first screwed toward the side of the impact plate to the distance to be adjusted, and then the cylinder rod of the impact plate adjusting hydraulic oil cylinder drives the adjusting frame to be pushed out in the same direction until the adjusting frame and the outer tightening nut are contacted, and then the inner tightening nut is screwed toward the side of the impact plate until it contacts the adjusting frame again, and finally the cylinder body of the impact plate adjusting hydraulic oil cylinder drives the adjusting frame to retract outward, so that the suspension screw drives the impact plate to move toward the rotor side, thereby reducing the spacing between the impact plate and the rotor; when the spacing between the impact plate and the rotor is adjusted to be larger, the adjusting frame is first pushed out to the distance to be adjusted by the impact plate adjusting hydraulic oil cylinder, and then the inner tightening nut is screwed toward the rotor side until it contacts the shell, and the impact plate adjusting hydraulic oil cylinder is retracted to the original position toward the rotor side, so that the inner tightening nut contacts the base frame, and finally the outer tightening nut and the first sleeve are tightened toward the rotor side.

4. The impact plate for a medium impact crusher according to claim 1, characterized in that: The spring screw assembly includes a spring screw that passes through the base frame and the adjusting frame. The spring screw is fixed to the base frame through a second locking nut and then fixed to the inside of the shell. A pressure plate is provided on the top of the spring screw. A pressure cap and a second sheath that are threadedly connected to the spring screw are provided above the pressure plate in sequence. A spring is sleeved on the spring screw between the pressure plate and the adjusting frame. The pressure plate presses one end of the spring through the pressure cap, and the other end of the spring presses the adjusting frame onto the shell.

5. The impact plate portion for a medium impact crusher according to claim 4, characterized in that: During normal production, the impact force generated by the material on the impact plate body is less than the spring pre-compression force, and the impact plate body remains stationary; when the crusher enters with difficult-to-crush foreign objects or is overloaded, the foreign objects and materials will be hit against the impact plate body, causing a strong impact on it. When the impact force is greater than the set pre-compression force of the spring, the spring will be compressed, causing the impact plate body to move backward, and the gap between the impact plate body and the rotor will increase, partially discharging the foreign objects or overloaded materials. At this time, the pressure on the impact plate body is reduced, and the spring will press the impact plate body back to its original position.

6. The method for operating the impact plate portion of a medium impact crusher according to claim 1, wherein: 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 hydraulic cylinder pin shaft can be inserted into the pin shaft hole.

7. The method for operating the impact plate portion of a medium impact crusher according to claim 6, wherein: A horizontal positioning hole is provided in the slider, which 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 U-shaped joint frame, and the upper positioning holes are located at 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 U-shaped 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 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.

8. The operating method of the impact plate portion of a medium-type impact crusher according to claim 7, characterized in that: When adjusting, push the slider to the lower maintenance position of the U-shaped 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, insert the pin into the upper positioning hole and the horizontal positioning hole of the slider, and the hydraulic cylinder pin does not need to be taken out of the lower arc groove.

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