Pressing device for single-shaft crusher

Abstract

The utility model discloses a material pressing device for a single-shaft crusher, and relates to the technical field of crusher equipment, the single-shaft crusher comprises a machine body and a crushing unit, the material pressing device comprises a material pressing main body, and the two sides of the material pressing main body are respectively provided with a supporting rod; the connecting shafts are rotationally arranged on the two side plates of the machine body, and the first end of each connecting shaft is fixedly connected with the corresponding supporting rod; the swing arm, the hydraulic cylinders and the outer walls of two side plates of the machine body are respectively provided with a fixed seat, the fixed end of each hydraulic cylinder is correspondingly and rotatably connected with the fixed seat, the telescopic end of each hydraulic cylinder is rotatably connected with the first end of the swing arm, and the second end of the swing arm is fixedly connected with the second end of the connecting shaft; and the hydraulic system is correspondingly connected with the two hydraulic cylinders, so that the two hydraulic cylinders synchronously contract and keep consistent force in the contraction process, and the length of the telescopic end of each hydraulic cylinder is L. According to the material pressing device for the single-shaft crusher, the two sides of the material pressing main body are uniformly stressed when materials are pressed and fed, so that the stability of the single-shaft crusher is improved, and the service life of the single-shaft crusher is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to a broken machine equipment technical field especially relates to a kind of material pressing device for single-shaft broken machine. BACKGROUND

[0002] With the increasing of environmental awareness and the growing demand of resource recycling, fine crushing treatment of various wastes has become an important link to realize effective resource recovery and recycling. As a kind of efficient and multifunctional crushing equipment, single-shaft broken machine plays an irreplaceable role in the fields of household waste treatment, electronic waste recycling, biomass energy development and industrial solid waste treatment.

[0003] Traditional single-shaft broken machine mainly crushes materials by fast tearing and shearing small blades, which can effectively deal with various types and hardness of waste and achieve high-efficiency crushing effect. In the prior art, a material pressing device is usually arranged on the single-shaft broken machine, which extrudes the materials in the crushing chamber to the crushing roller through the material press, so as to optimize the crushing process and improve the crushing efficiency.

[0004] However, although the arrangement of the material pressing device solves the problem of material accumulation to some extent, in actual application, the material press is often subjected to uneven force when extruding materials. Especially on large single-shaft broken machines, since the material press is relatively long, the materials entering the crushing chamber often do not scatter evenly in the chamber, but accumulate on one side of the crushing machine. In this case, if the hydraulic cylinder cannot ensure that the two sides of the material press are subjected to synchronous and consistent force when pulling the material press, the material press is prone to twist and deform after long-term use, and even directly collide with the rapidly rotating knife shaft, causing serious damage to the equipment, affecting production efficiency, and increasing the maintenance cost and safety hazard of the equipment.

[0005] Therefore, how to provide a material pressing device for single-shaft broken machine to ensure that the two sides are subjected to uniform force when extruding materials, so as to improve the stability and service life of the single-shaft broken machine is a technical problem that needs to be solved by those skilled in the art at present. UTILITY MODEL CONTENTS

[0006] The utility model aims at providing a material pressing device for single-shaft broken machine, which solves the technical problem that the existing material press is prone to twist and deform.

[0007] To achieve the above-mentioned purpose, the utility model provides a material pressing device for single-shaft broken machine, the single-shaft broken machine includes a machine body and a crushing unit, the machine body is provided with a crushing chamber, the crushing unit and the material pressing device are both installed in the crushing chamber, and the material pressing device comprises:

[0008] A material pressing body is provided with a supporting rod on each side;

[0009] connecting shafts, rotatably arranged on the two side plates of the machine body, a first end of each of the connecting shafts being fixedly connected to the corresponding support rod, the first end of the connecting shaft being located inside the machine body, and the second end extending to the outside of the machine body;

[0010] swing arms and hydraulic cylinders, the outer walls of the two side plates of the machine body each being provided with a fixed seat, the fixed end of each of the hydraulic cylinders being rotatably connected to the corresponding fixed seat, the telescopic end of the hydraulic cylinder being rotatably connected to the first end of the swing arm, and the second end of the swing arm being fixedly connected to the second end of the connecting shaft, so that the pressing main body is driven to rotate by the extension and retraction of the hydraulic cylinder to approach or move away from the crushing unit;

[0011] a hydraulic system corresponding to the two hydraulic cylinders, so that the two hydraulic cylinders are synchronously retracted and maintain consistent force during the retraction process, the length of the telescopic end of the hydraulic cylinder being L, when the telescopic end of the hydraulic cylinder is in the fully extended state, the pressing main body is located at the jacking limit position, and when the telescopic end of the hydraulic cylinder is in the fully retracted state, the pressing main body is located at the pressing limit position, close to but not in contact with the crushing unit.

[0012] Preferably, the hydraulic system comprises:

[0013] a first hydraulic pipeline and a second hydraulic pipeline, the first ends of the first hydraulic pipeline and the second hydraulic pipeline being connected to the oil pump of the hydraulic station, the second ends of the first hydraulic pipeline and the second hydraulic pipeline being correspondingly connected to a first shunt valve and a second shunt valve, the first shunt valve and the second shunt valve each being provided with two shunt ports, the two shunt ports of the first shunt valve being respectively in communication with the first oil ports of the two hydraulic cylinders, and the two shunt ports of the second shunt valve being respectively in communication with the second oil ports of the two hydraulic cylinders.

[0014] Preferably, a proximity sensor is further included, arranged on the machine body, and signal connected to the oil pump of the hydraulic station, and sending a signal to stop the work of the hydraulic cylinder when a preset proximity distance is reached.

[0015] Preferably, the proximity sensor is a travel switch or a photoelectric sensor.

[0016] Preferably, keyway holes are arranged on the support rods and the swing arms, and the first end and the second end of the connecting shaft are each provided with a key matched with the keyway hole.

[0017] Preferably, the connecting shaft is rotatably connected to the side plate of the machine body through a bearing seat.

[0018] Preferably, the fixed end of the hydraulic cylinder is connected to the fixed seat through a pin shaft.

[0019] With respect to the above background, the utility model provides a kind of for single-shaft crusher's pressure device, two hydraulic cylinders can be kept in contraction process by hydraulic system consistent, therefore can avoid the equipment damage or safety accident caused by pressure body due to uneven force, by limiting the length of the telescopic end of hydraulic cylinder L, prevent the collision of pressure body and crushing unit, further realize mechanical limit, to improve the stability and service life of single-shaft crusher. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below, and obviously, the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of the provided drawings.

[0021] Figure 1 A jacking limit position schematic diagram of the pressure device for single-shaft crusher provided by the embodiments of the present application is provided.

[0022] Figure 2 A pressure limit position schematic diagram of the pressure device for single-shaft crusher provided by the embodiments of the present application is provided.

[0023] Figure 3 A structure schematic diagram of the pressure device provided by the embodiments of the present application is provided.

[0024] Among them:

[0025] 1-body, 2-crushing unit, 3-crushing cavity, 4-pressure body, 5-brace, 6-connecting shaft, 7-swing arm, 8-hydraulic cylinder, 9-first hydraulic pipeline, 10-second hydraulic pipeline, 11-first shunt valve, 12-second shunt valve, 13-first oil port, 14-second oil port. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application, and obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0027] In order to make those skilled in the art better understand the technical scheme of the present application, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0028] Referring to Figures 1-3The application provides a material pressing device for a single-shaft crusher, the single-shaft crusher comprising a machine body 1 and a crushing unit 2, the machine body 1 being provided with a crushing cavity 3, the crushing unit 2 and the material pressing device being installed in the crushing cavity 3, the material pressing device comprising a material pressing body 4, each side of the material pressing body 4 being provided with a supporting rod 5; a connecting shaft 6 being rotatably arranged on the left and right side plates of the machine body 1, the first end of each connecting shaft 6 being fixedly connected with the corresponding supporting rod 5, the first end of the connecting shaft 6 being located on the inner side of the machine body 1, and the second end extending to the outer side of the machine body 1; a swing arm 7 and a hydraulic cylinder 8, the outer walls of the side plates of the machine body 1 being each provided with a fixed seat, the fixed end of each hydraulic cylinder 8 being rotatably connected with the fixed seat, the telescopic end of the hydraulic cylinder 8 being rotatably connected with the first end of the swing arm 7, and the second end of the swing arm 7 being fixedly connected with the second end of the connecting shaft 6, so that the material pressing body 4 is driven to rotate by the telescopic driving of the hydraulic cylinder 8 to approach or move away from the crushing unit 2; and a hydraulic system being connected with the two hydraulic cylinders 8 to make the two hydraulic cylinders 8 synchronously contract and keep the same force during the contraction process, the length of the telescopic end of the hydraulic cylinder 8 being L, the material pressing body 4 being located at a jacking limit position when the telescopic end of the hydraulic cylinder is in a fully extended state, and the material pressing body 4 being located at a material pressing limit position when the telescopic end of the hydraulic cylinder is in a fully retracted state, the material pressing body 4 being close to but not in contact with the crushing unit 2.

[0029] Specifically, the machine body 1 is internally provided with the crushing cavity 3 for accommodating the crushing unit 2 and the material pressing device; the crushing unit 2 is installed in the crushing cavity 3 and is responsible for crushing the material into the required particle size, the structure of the crushing unit 2 being directly used in the prior art, and the patent 201910243483.0 disclosed by China can be referred to as a crusher for light materials.

[0030] The material pressing body 4 is used for pressing the material on the crushing unit 2 for crushing, and each side of the material pressing body 4 is provided with the supporting rod 5 for being connected with the connecting shaft 6, the connecting shaft 6 being rotatably arranged on the side plates of the machine body 1 for connecting the material pressing body 4 and the swing arm 7, the first end of the connecting shaft 6 being fixedly connected with the supporting rod 5, and the second end extending to the outside of the machine body 1 and being connected with the swing arm 7; the swing arm 7 is used for transmitting the driving force of the hydraulic cylinder 8 to the connecting shaft 6, so as to drive the material pressing body 4 to rotate, the hydraulic cylinder 8 being used as a driving device, the fixed end of the hydraulic cylinder 8 being rotatably connected with the fixed seat of the machine body 1, and the telescopic end being rotatably connected with the first end of the swing arm 7, the swing arm 7 and the connecting shaft 6 being driven to rotate by the telescopic movement of the hydraulic cylinder 8, and the material pressing body 4 being further driven to rotate.

[0031] The hydraulic system is used for controlling the synchronous contraction of the two hydraulic cylinders 8 and keeping the same force during the contraction process, so as to ensure that the material pressing body 4 can stably and uniformly approach or move away from the crushing unit 2.

[0032] Working principle:

[0033] Initial state, when the telescopic end of the hydraulic cylinder 8 is in the fully extended state, the pressing body 4 is located at the lifting limit position (as shown in Figure 1 , at this time, the pressing body 4 keeps a certain distance from the crushing unit 2, which is convenient for the feeding of the material.

[0034] Pressing process, when the material needs to be crushed, the hydraulic system is started, and the two hydraulic cylinders 8 are controlled to shrink synchronously. With the shortening of the telescopic end of the hydraulic cylinder 8, the swing arm 7 and the connecting shaft 6 rotate, driving the pressing body 4 to gradually approach the crushing unit 2. When the telescopic end of the hydraulic cylinder 8 is completely retracted, the pressing body 4 is located at the pressing limit position (as shown in Figure 2 , at this time, it is close to but does not contact the crushing unit 2, which ensures the effective pressing and feeding of the material without affecting the crushing process. Since the hydraulic system can keep the force of the two hydraulic cylinders 8 consistent during the shrinking process, the pressing body 4 can stably and uniformly approach the crushing unit 2 to press the material on the crushing unit 2 for crushing.

[0035] Reset process, when the material crushing is completed, the hydraulic system is started again, and the two hydraulic cylinders 8 are controlled to extend synchronously. With the lengthening of the telescopic end of the hydraulic cylinder 8, the swing arm 7 and the connecting shaft 6 rotate in the opposite direction, driving the pressing body 4 to gradually move away from the crushing unit 2 and return to the initial position, preparing for the next crushing operation.

[0036] Therefore, through the pressing device for the single-shaft crusher provided in the application, the hydraulic system can keep the force of the two hydraulic cylinders 8 consistent during the shrinking process, so that the damage or safety accidents of the equipment caused by the uneven force of the pressing body 4 can be avoided. By limiting the length of the telescopic end of the hydraulic cylinder 8 to L, the collision between the pressing body 4 and the crushing unit 2 is prevented, and mechanical limiting is realized, so as to improve the stability and service life of the single-shaft crusher.

[0037] Specifically, the telescopic end of the hydraulic cylinder 8 is a hydraulic rod, and the length L of the hydraulic rod can be selected according to actual needs to ensure that when the hydraulic rod is in the fully extended state, the pressing body 4 is located at the lifting limit position, which is convenient for feeding the material, and when the hydraulic rod is in the completely retracted state, the pressing body 4 is located at the pressing limit position and is close to but not in contact with the crushing unit 2.

[0038] On the basis of the above embodiment, the hydraulic system comprises a first hydraulic pipeline 9 and a second hydraulic pipeline 10. The first ends of the first hydraulic pipeline 9 and the second hydraulic pipeline 10 are connected with an oil pump of a hydraulic station, the second ends are correspondingly connected with a first shunt valve 11 and a second shunt valve 12, the first shunt valve 11 and the second shunt valve 12 are both provided with two shunt ports, the two shunt ports of the first shunt valve 11 are respectively communicated with first oil ports 13 of the two hydraulic cylinders 8, and the two shunt ports of the second shunt valve 12 are respectively communicated with second oil ports 14 of the two hydraulic cylinders 8.

[0039] The hydraulic station, as a power source of the hydraulic system, comprises an oil pump and an oil tank. The oil pump is responsible for pumping hydraulic oil from the oil tank and delivering it to each hydraulic cylinder through a pipeline.

[0040] The first hydraulic pipeline 9 and the second hydraulic pipeline 10 are respectively connected to the oil pump and the two flow dividing and collecting valves of the hydraulic station. The first hydraulic pipeline 9 is responsible for delivering hydraulic oil to the first flow dividing and collecting valve 11, while the second hydraulic pipeline 10 is responsible for delivering hydraulic oil to the second flow dividing and collecting valve 12.

[0041] The first flow dividing and collecting valve 11 and the second flow dividing and collecting valve 12 each have two flow dividing ports for uniformly distributing hydraulic oil to the two hydraulic cylinders. The two flow dividing ports of the first flow dividing and collecting valve 11 are respectively connected to the first oil ports 13 of the two hydraulic cylinders 8, while the two flow dividing ports of the second flow dividing and collecting valve 12 are respectively connected to the second oil ports 14 of the two hydraulic cylinders 8.

[0042] When it is necessary to start the material pressing device to press material:

[0043] The oil pump connected to the second hydraulic pipeline 10 starts to work to pump hydraulic oil from the oil tank. The hydraulic oil is delivered to the second flow dividing and collecting valve 12 through the second hydraulic pipeline 10, and the two flow dividing ports of the second flow dividing and collecting valve 12 are respectively connected to the second oil ports 14 of the two hydraulic cylinders 8 to realize oil inlet, while the first oil ports 13 of the two hydraulic cylinders 8 are connected to the two flow dividing ports of the first flow dividing and collecting valve 11 to realize oil outlet, and the hydraulic oil is recovered to the oil tank through the first hydraulic pipeline 9. Under the drive of the hydraulic oil, the hydraulic rods of the two hydraulic cylinders 8 are synchronously retracted with consistent pulling force, driving the material pressing body 4 to rotate towards the crushing unit 2, so as to compress the material and send it to the crushing unit 2 for crushing.

[0044] When starting the material pressing device to add material:

[0045] The operation process is opposite to that of starting the material pressing device to press material. The oil pump delivers hydraulic oil to the first flow dividing and collecting valve 11 through the first hydraulic pipeline 9, and the first flow dividing and collecting valve 11 distributes the hydraulic oil to the first oil ports 13 of the two hydraulic cylinders 8 to realize oil inlet. At the same time, the second oil ports 14 of the two hydraulic cylinders 8 are connected to the oil tank through the second hydraulic pipeline 10 and the second flow dividing and collecting valve 12 to realize oil outlet. Under the drive of the hydraulic oil, the hydraulic rods of the two hydraulic cylinders 8 are synchronously extended, driving the material pressing body 4 to move away from the crushing unit 2, thereby providing space for adding material.

[0046] Specifically, flow meters are arranged on the first hydraulic pipeline 9 and the second hydraulic pipeline 10 respectively, and the flow meters are in signal connection with the oil pumps connected to the first hydraulic pipeline 9 and the second hydraulic pipeline 10, so that when the hydraulic oil input into the corresponding hydraulic pipeline reaches a certain flow, the corresponding oil pump is stopped, and the extension or contraction of the oil pump is stopped.

[0047] The specific process is as follows:

[0048] When it is necessary to start the pressing device to press materials or add materials, the oil pump connected to the first hydraulic pipeline 9 or the second hydraulic pipeline 10 is started first.

[0049] After the oil pump starts to work, hydraulic oil is extracted from the oil tank and delivered to the flow and collection valve through the corresponding hydraulic pipeline (the first hydraulic pipeline 9 or the second hydraulic pipeline 10).

[0050] The flow meters arranged on the hydraulic pipelines can monitor the flow of hydraulic oil in real time, and the flow meters are in signal connection with the corresponding oil pumps to feed back the flow information in real time; when the flow of hydraulic oil in the hydraulic pipeline reaches a preset threshold, the flow meter sends a signal to the oil pump.

[0051] After receiving the signal, the oil pump will determine whether it needs to stop working according to the preset logic. Generally, when the hydraulic cylinder reaches the expected extension or contraction position, the flow of hydraulic oil input into the corresponding hydraulic pipeline will reach the preset threshold, at which time the oil pump will stop working to avoid overextension or contraction of the hydraulic cylinder.

[0052] Under the drive of the hydraulic oil, the hydraulic rods of the two hydraulic cylinders are extended or contracted synchronously. Since the flow meters on the hydraulic pipelines can monitor the flow in real time and control the stopping of the oil pump, the synchronization and consistency of the two hydraulic cylinders can be ensured.

[0053] On the basis of the above embodiment, a proximity sensor is further arranged in the machine body 1 and is in signal connection with the oil pump of the hydraulic station, and sends a signal to stop the hydraulic cylinder 8 when a preset proximity distance is reached.

[0054] The proximity sensor is arranged on the machine body 1, and when the hydraulic rod of the hydraulic cylinder 8 is in a fully retracted state, i.e., the pressing body 4 is located at a pressing limit position, the proximity sensor is arranged forwardly relative to the pressing body 4, which means that during the movement of the pressing body 4 towards the crushing unit 2, the proximity sensor will detect the pressing body 4 before it reaches the pressing limit position.

[0055] The proximity sensor is in signal connection with the oil pump of the hydraulic station, allowing the proximity sensor to send a signal to the oil pump when the proximity sensor detects the approach of the pressing body 4.

[0056] When the proximity sensor detects that the pressing body 4 reaches the preset proximity distance, a stop signal is immediately sent to the oil pump.

[0057] Through the above setting, the proximity sensor realizes the first limiting function of the movement of the pressing body 4, which means that even if the pressing body 4 continues to move towards the crushing unit 2 due to some reasons such as control system failure, the mechanical stroke of the hydraulic cylinder prevents its further movement, thereby avoiding possible collision or damage and realizing double limiting.

[0058] On the basis of the above embodiment, the proximity sensor is a travel switch or a photoelectric sensor.

[0059] On the basis of the above embodiment, the support rod 5 and the swing arm 7 are provided with key groove holes, and the first end and the second end of the connecting shaft 6 are provided with keys matched with the key groove holes; the connecting shaft 6 is rotatably connected to the side plate of the machine body 1 through a bearing seat; and the fixed end of the hydraulic cylinder 8 is connected to the fixed seat through a pin shaft.

[0060] That is, the support rod 5 and the swing arm 7 are designed with key groove holes, and the first end and the second end of the connecting shaft 6 are provided with keys matched with the key groove holes. When the keys at both ends of the connecting shaft 6 are inserted into the key groove holes of the support rod 5 and the swing arm 7, the keys can ensure that the support rod 5, the swing arm 7 and the connecting shaft 6 cannot rotate relative to each other, thereby improving the stability and reliability of the connection.

[0061] The connecting shaft 6 is rotatably connected to the side plate of the machine body 1 through a bearing seat, and the use of the bearing seat not only improves the rotation flexibility of the connecting shaft 6, but also prolongs the service life of the connecting shaft 6 and reduces the wear and failure caused by friction.

[0062] The fixed end of the hydraulic cylinder 8 is connected to the fixed seat through a pin shaft, and the pin shaft connection method is simple and easy to implement and has high strength and stability.

[0063] It should be noted that in the present specification, relational terms such as first and second are used only to distinguish one entity from another, and do not necessarily require or imply any such actual relationship or order between the entities.

[0064] The principles and implementation modes of the present application are described by using specific examples in the present specification, and the above description of the examples is only used to help understand the method and core idea of the present application. It should be pointed out that for ordinary skilled persons in the technical field, some improvements and modifications can be made to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A material pressing device for a single-shaft crusher, the single-shaft crusher comprising a machine body (1) and a crushing unit (2), the machine body (1) being provided with a crushing cavity (3) therein, the crushing unit (2) and the material pressing device being installed in the crushing cavity (3), characterized in that, The pressing device comprises: a pressing body (4) provided with a support rod (5) on each side; a connecting shaft (6) rotatably arranged on the two side plates of the machine body (1), the first end of each connecting shaft (6) is fixedly connected with the corresponding support rod (5), the first end of the connecting shaft (6) is located inside the machine body (1), and the second end extends to the outside of the machine body (1); a swing arm (7) and a hydraulic cylinder (8), the outer wall of the two side plates of the machine body (1) is provided with a fixed seat, the fixed end of each hydraulic cylinder (8) is rotatably connected with the fixed seat, the telescopic end of the hydraulic cylinder (8) is rotatably connected with the first end of the swing arm (7), and the second end of the swing arm (7) is fixedly connected with the second end of the connecting shaft (6), so that the pressing body (4) is driven to rotate by the extension and retraction of the hydraulic cylinder (8) to approach or move away from the crushing unit (2); a hydraulic system connected with the two hydraulic cylinders (8) to make the two hydraulic cylinders (8) synchronously contract and maintain consistent force during contraction, the length of the telescopic end of the hydraulic cylinder is L, when the telescopic end of the hydraulic cylinder is in a fully extended state, the pressing body (4) is located at a jacking limit position, and when the telescopic end of the hydraulic cylinder is in a fully retracted state, the pressing body (4) is located at a pressing limit position and is close to but not in contact with the crushing unit (2).

2. A press arrangement for a single shaft crusher as claimed in claim 1, characterized in that The hydraulic system comprises: a first hydraulic pipeline (9) and a second hydraulic pipeline (10), the first ends of the first hydraulic pipeline (9) and the second hydraulic pipeline (10) are connected with an oil pump of a hydraulic station, the second ends are connected with a first shunt valve (11) and a second shunt valve (12) respectively, the first shunt valve (11) and the second shunt valve (12) are each provided with two shunt ports, the two shunt ports of the first shunt valve (11) are respectively in communication with the first oil ports (13) of the two hydraulic cylinders (8), and the two shunt ports of the second shunt valve (12) are respectively in communication with the second oil ports (14) of the two hydraulic cylinders (8).

3. A pressure bar for a single shaft crusher as claimed in claim 2, characterized in that A proximity sensor is further arranged on the machine body (1) and is in signal connection with the oil pump of the hydraulic station, and sends a signal to stop the work of the hydraulic cylinder (8) when a preset proximity distance is reached.

4. A pressure bar for a single shaft crusher as claimed in claim 3, characterized in that The proximity sensor is a travel switch or a photoelectric sensor.

5. A pressure bar for a single shaft crusher as claimed in claim 1, characterized in that Key grooves are arranged on the support rods (5) and the swing arms (7), and the first end and the second end of the connecting shaft (6) are provided with keys matched with the key grooves.

6. A pressure bar for a single shaft crusher as claimed in claim 1, characterized in that The connecting shaft (6) is rotatably connected to the side plates of the machine body (1) through a bearing seat.

7. A pressure bar for a single shaft crusher as claimed in claim 1, characterized in that The fixed end of the hydraulic cylinder (8) is connected with the fixed seat through a pin shaft.

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