Novel crawler-type mobile screening station hydraulic system

Abstract

The utility model relates to a novel hydraulic system of a crawler-type mobile screening station, and belongs to the technical field of crawler-type mobile screening station production. The five sets of metering pumps correspond to the five sets of electromagnetic valves one to one, a fine material conveying belt motor and a screen box motor are arranged on a first working oil way between the first electromagnetic valve and the oil tank in series, and a feeding conveying belt motor is arranged on a second working oil way between the second electromagnetic valve and the oil tank. A feeding conveying belt motor is arranged on the third working oil way between the fifth electromagnetic valve and the oil tank, and a transfer belt motor and a super-large material conveying belt motor are arranged on the fourth working oil way between the sixth electromagnetic valve and the oil tank in series. A medium material conveying belt motor and a large material conveying belt motor are arranged on the fifth working oil way between the seventh electromagnetic valve and the oil tank in a series connection mode, and a plurality of oil cylinder driving valve sets are arranged on the sixth working oil way between the seventh electromagnetic valve and the oil tank in a series connection mode. The device has the advantages that pipelines are simplified, a diverter valve used when the motors are connected in parallel is omitted, and energy consumption is reduced.

Description

Technical Field

[0001] The utility model relates to a hydraulic system of a new type crawler mobile screening station, belonging to the production technical field of crawler mobile screening stations. Background Technique

[0002] A crawler mobile screening station is a movable device that screens mixed materials into materials with various required particle sizes. It has 7 belts for transporting materials, a screening box, a crawler system for the machine to move, and 21 groups of oil cylinders for auxiliary support actions. When in use, first turn on the travel control, control the solenoid valve through a remote controller, move the machine to a specified position, then close the travel solenoid valve, turn on the oil cylinder solenoid valve, and control the oil cylinders through each manual valve to fix each belt to a predetermined position. Close the oil cylinder solenoid valve, turn on the controller working button, and each belt opens the screening box and each transport belt in sequence through the logic set by the controller, and the solenoid valve is controlled by the controller.

[0003] Refer to Figure 2-4 , the traditional crawler mobile screening station specifically includes a fine material conveying belt 9.1, a screening box, a feeding belt 11.1, a feeding conveying belt 12.1, a transfer belt 13.1, an oversized material conveying belt 14.1, a medium material conveying belt 15.1, a large material conveying belt 16.1. The fine material conveying belt 9.1, the feeding belt 11.1, the feeding conveying belt 12.1, the transfer belt 13.1, the oversized material conveying belt 14.1, the medium material conveying belt 15.1, and the large material conveying belt 16.1 are respectively driven by a fine material conveyor belt motor 9, a screening box motor 10, a feeding conveyor belt motor 11, a feeding conveying belt motor 12, a transfer belt motor 13, an oversized material conveyor belt motor 14, a medium material conveyor belt motor 15, and a large material conveyor belt motor 16. It also includes a large material folding oil cylinder, a fine material lifting oil cylinder, a fine material head folding oil cylinder, a feeding head adjustment oil cylinder, a front leg oil cylinder, a screening box lifting oil cylinder, a feeding belt leg oil cylinder, a screening box tail lifting oil cylinder, a transfer belt adjustment oil cylinder, an oversized material rotating oil cylinder, an oversized material frame lifting oil cylinder, a medium material folding oil cylinder, and an oversized material tie rod oil cylinder. Among them, the feeding belt receives the feeding of a loader or an excavator and then transports it to the feeding belt. The feeding conveying belt is used to feed the screening box. The function of the screening box is to separate materials of different specifications, and the function of each belt is to transport materials of different specifications.

[0004] Currently, the technology has incomplete considerations and has the following drawbacks: When the motors are used in parallel, it is necessary to shunt through a flow divider to distribute the flow to each motor as required, resulting in more pipelines and joints in the system, increased system leakage, and easy oil pollution.

[0005] To solve one of the above problems, a new type of hydraulic system for a crawler mobile screening station is urgently needed. Summary of the Invention

[0006] In view of the above deficiencies in the prior art, the technical problem to be solved by the present utility model is: how to simplify the pipeline, cancel the flow dividing valve when the motors are used in parallel, and reduce energy consumption. For this purpose, a new hydraulic system for a crawler mobile screening station is provided.

[0007] The new hydraulic system for a crawler mobile screening station of the present utility model includes a first solenoid valve, a second solenoid valve, a third solenoid valve, a fourth solenoid valve, a fifth solenoid valve, a sixth solenoid valve, a seventh solenoid valve and five groups of fixed displacement pumps. It is characterized in that: there is a one-to-one correspondence between the five groups of fixed displacement pumps and the five groups of solenoid valves. A fine material conveyor belt motor and a screen box motor are serially arranged on the first working oil path between the first solenoid valve and the fuel tank. A feeding conveyor belt motor is arranged on the second working oil path between the second solenoid valve and the fuel tank. A feeding conveyor belt motor is arranged on the third working oil path between the fifth solenoid valve and the fuel tank. A transfer belt motor and an oversized material conveyor belt motor are serially arranged on the fourth working oil path between the sixth solenoid valve and the fuel tank. A medium material conveyor belt motor and a large material conveyor belt motor are serially arranged on the fifth working oil path between the seventh solenoid valve and the fuel tank. A plurality of oil cylinder drive valve groups are serially arranged on the sixth working oil path between the seventh solenoid valve and the fuel tank.

[0008] Preferably, the first solenoid valve, the second solenoid valve, the fifth solenoid valve and the sixth solenoid valve are all two-position four-way solenoid valves.

[0009] Preferably, a third solenoid valve is serially arranged on the seventh working oil path between the second solenoid valve and the left traveling motor assembly; a fourth solenoid valve is serially arranged on the eighth working oil path between the fifth solenoid valve and the right traveling motor assembly.

[0010] Preferably, the third solenoid valve, the fourth solenoid valve and the seventh solenoid valve are all three-position four-way solenoid valves.

[0011] Preferably, the five groups of fixed displacement pumps are respectively a first fixed displacement pump, a second fixed displacement pump, a third fixed displacement pump, a fourth fixed displacement pump and a fifth fixed displacement pump. The oil outlets of the first fixed displacement pump, the second fixed displacement pump, the third fixed displacement pump, the fourth fixed displacement pump and the fifth fixed displacement pump are respectively connected to the oil inlets of the first solenoid valve, the second solenoid valve, the fifth solenoid valve, the sixth solenoid valve and the seventh solenoid valve.

[0012] Preferably, the oil cylinder drive valve group includes 13 oil cylinder drive valves connected in series in sequence, which respectively correspond to the large material folding oil cylinder, the fine material lifting oil cylinder, the fine material head folding oil cylinder, the feeding head adjusting oil cylinder, the front leg oil cylinder, the sieve box lifting oil cylinder, the feeding belt leg oil cylinder, the sieve box tail lifting oil cylinder, the transfer belt adjusting oil cylinder, the oversize material rotating oil cylinder, the oversize material frame lifting oil cylinder, the medium material folding oil cylinder, and the oversize material tie rod oil cylinder one by one.

[0013] Preferably, the large material folding oil cylinder, the fine material lifting oil cylinder, the feeding head adjusting oil cylinder, the sieve box lifting oil cylinder, the feeding belt leg oil cylinder, the sieve box tail lifting oil cylinder, the oversize material frame lifting oil cylinder, and the medium material folding oil cylinder are all arranged in pairs.

[0014] The present invention controls the overall machine movement of the crawler-type transfer screening station. Five fixed-displacement pumps on the crawler-type mobile screening station supply oil to seven belt motors, one sieve box, two traveling motors, and 21 oil cylinders through seven solenoid valves, and the solenoid valves are all controlled by a controller.

[0015] The lifting fine material conveyor belt motor, the feeding conveyor belt motor, the feeding head conveyor belt motor, the transfer belt motor, the oversize material conveyor belt motor, the medium material conveyor belt motor, and the large material conveyor belt motor belong to the belt motors. The belt motors, the traveling motors, and the hydraulic cylinders do not work simultaneously.

[0016] After the engine is started and there is no action, the solenoid valves are not energized, and the hydraulic oil directly returns to the oil tank through the right position of the second solenoid valve and the fifth solenoid valve and the middle H position of the third solenoid valve and the fourth solenoid valve.

[0017] When traveling, the second solenoid valve and the fifth solenoid valve are not energized, and the traveling motors are controlled through the left and right positions of the third solenoid valve and the fourth solenoid valve to make the machine complete forward, backward, and turning actions.

[0018] When the belt is working, the first solenoid valve, the second solenoid valve, the fifth solenoid valve, and the sixth solenoid valve are energized, the right side of the seventh solenoid valve is energized, and each belt motor is supplied with oil to work. The opening sequence of each solenoid valve is controlled by the controller.

[0019] Among them, the fine material conveyor belt motor and the sieve box motor are connected in series, the transfer belt motor and the oversize material conveyor belt motor are connected in series, and the medium material conveyor belt motor and the large material conveyor belt motor are connected in series.

[0020] When the oil cylinder needs to act, the left side of the seventh solenoid valve is energized, the oil cylinder pipeline is supplied with oil, and three manual valves for controlling the oil cylinder are connected in series to complete the actions of 21 oil cylinders. Each oil cylinder is installed with a throttle orifice to control the flow rate to make the oil cylinder action stable. The engine speed regulating system is used to adjust the flow rate, reduce the use of flow dividers, and reduce energy consumption.

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

[0022] For the hydraulic system of the new crawler mobile screening station described in the utility model, in the present invention, relevant motors that can act together are used in series on the mobile screening equipment, simplifying the pipeline, canceling the flow dividing valve when the motors are used in parallel, and reducing the energy consumption. Secondly, through the combined control of the middle H oil passage of the two-position four-way solenoid valve and the three-position four-way solenoid valve on the mobile screening equipment, the oil circuit is switched between the travel motor and the working motor. When not working, the middle H function of the three-position four-way solenoid valve can be used to directly return the hydraulic oil to the fuel tank, reducing one solenoid valve. Thirdly, through the switching of the three-position four-way solenoid valve on the mobile screening equipment, the direct switching of the hydraulic oil between the motor action and the cylinder action is completed. At the same time, the three groups of cylinder reversing valves adopt a series mode, simplifying the pipeline and reducing the cost. Brief Description of the Drawings

[0023] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. In all the drawings, similar elements or parts are generally denoted by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to actual scale.

[0024] Figure 1 It is a schematic diagram of the system of the utility model;

[0025] Figure 2 It is the structure of the crawler mobile screening station Figure 1 ;

[0026] Figure 3 It is the structure of the crawler mobile screening station Figure 2 ;

[0027] Figure 4 It is the structure of the crawler mobile screening station Figure 3 ;

[0028] In the figure: 1. First solenoid valve; 2. Second solenoid valve; 3. Third solenoid valve; 4. Fourth solenoid valve; 5. Fifth solenoid valve; 6. Sixth solenoid valve; 7. Seventh solenoid valve; 8. Dosing pump; 9. Fine material conveyor belt motor; 10. Screen box motor; 11. Feeding conveyor belt motor; 12. Loading conveyor belt motor; 13. Transfer belt motor; 14. Over-sized material conveyor belt motor; 15. Medium-sized material conveyor belt motor; 16. Large material conveyor belt motor; 17. Fuel tank; 18. Left travel motor assembly; 19. Right travel motor assembly; 20. Large material folding oil cylinder; 21. Fine material lifting oil cylinder; 22. Fine material head folding oil cylinder; 23. Loading head adjustment oil cylinder; 24. Front leg oil cylinder; 25. Screen box lifting oil cylinder; 26. Feeding belt leg oil cylinder; 27. Screen box tail lifting oil cylinder; 28. Transfer belt adjustment oil cylinder; 29. Over-sized material rotating oil cylinder; 30. Over-sized material frame lifting oil cylinder; 31. Medium material folding oil cylinder; 32. Over-sized material tie rod oil cylinder. Detailed implementation mode

[0029] The present utility model will be further described below in conjunction with the accompanying drawings: The following further illustrates the present utility model through specific embodiments, but the present utility model is not limited thereto. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present utility model.

[0030] Example 1, as Figure 1 shown, the hydraulic system of a new type of crawler mobile screening station includes a first solenoid valve 1, a second solenoid valve 2, a third solenoid valve 3, a fourth solenoid valve 4, a fifth solenoid valve 5, a sixth solenoid valve 6, a seventh solenoid valve 7 and five groups of dosing pumps 8. It is characterized in that: there is a one-to-one correspondence between the five groups of dosing pumps and the five groups of solenoid valves. A fine material conveyor belt motor 9 and a screen box motor 10 are serially arranged on the first working oil path between the first solenoid valve 1 and the fuel tank 17. A feeding conveyor belt motor 11 is arranged on the second working oil path between the second solenoid valve 2 and the fuel tank 17. A loading conveyor belt motor 12 is arranged on the third working oil path between the fifth solenoid valve 5 and the fuel tank 17. A transfer belt motor 13 and an over-sized material conveyor belt motor 16 are serially arranged on the fourth working oil path between the sixth solenoid valve 6 and the fuel tank 17. A medium-sized material conveyor belt motor 15 and a large material conveyor belt motor 16 are serially arranged on the fifth working oil path between the seventh solenoid valve 7 and the fuel tank 17. A plurality of oil cylinder drive valve groups are serially arranged on the sixth working oil path between the seventh solenoid valve 7 and the fuel tank 17.

[0031] The hydraulic system of the new crawler-type mobile screening station described in the utility model simplifies the pipeline by serially using relevant motors that can act together on the mobile screening equipment, cancels the flow control valve when motors are used in parallel, and reduces energy consumption. Secondly, through the combined control of the middle H oil passage of the two-position four-way solenoid valve and the three-position four-way solenoid valve on the mobile screening equipment, the oil circuit is switched between the travel motor and the working motor. When not working, the middle H function of the three-position four-way solenoid valve can be used to directly return the hydraulic oil to the fuel tank, reducing one solenoid valve. Thirdly, through the switching of the three-position four-way solenoid valve on the mobile screening equipment, the direct switching of the hydraulic oil between the motor action and the cylinder action is completed. At the same time, the three groups of cylinder reversing valves adopt a series mode, simplifying the pipeline and reducing costs.

[0032] Embodiment 2, as Figure 1 shown, the hydraulic system of a new crawler-type mobile screening station includes a first solenoid valve 1, a second solenoid valve 2, a third solenoid valve 3, a fourth solenoid valve 4, a fifth solenoid valve 5, a sixth solenoid valve 6, a seventh solenoid valve 7 and five groups of fixed displacement pumps 8. It is characterized in that: there is a one-to-one correspondence between the five groups of fixed displacement pumps and the five groups of solenoid valves. A fine material conveyor belt motor 9 and a screening box motor 10 are serially arranged on the first working oil path between the first solenoid valve 1 and the fuel tank 17. A feeding conveyor belt motor 11 is arranged on the second working oil path between the second solenoid valve 2 and the fuel tank 17. A feeding conveyor belt motor 12 is arranged on the third working oil path between the fifth solenoid valve 5 and the fuel tank 17. A transfer belt motor 13 and an oversized material conveyor belt motor 16 are serially arranged on the fourth working oil path between the sixth solenoid valve 6 and the fuel tank 17. A medium material conveyor belt motor 15 and a large material conveyor belt motor 16 are serially arranged on the fifth working oil path between the seventh solenoid valve 7 and the fuel tank 17. Multiple groups of cylinder driving valve sets are serially arranged on the sixth working oil path between the seventh solenoid valve 7 and the fuel tank 17.

[0033] Furthermore, the first solenoid valve 1, the second solenoid valve 2, the fifth solenoid valve 5 and the sixth solenoid valve 6 are all two-position four-way solenoid valves.

[0034] Furthermore, a third solenoid valve 3 is serially arranged on the seventh working oil path between the second solenoid valve 2 and the left travel motor assembly 18. A fourth solenoid valve 4 is serially arranged on the eighth working oil path between the fifth solenoid valve 5 and the right travel motor assembly 19.

[0035] Furthermore, the third solenoid valve 3, the fourth solenoid valve 4 and the seventh solenoid valve 7 are all three-position four-way solenoid valves.

[0036] Further, the five groups of the metering pumps 8 are respectively a first metering pump, a second metering pump, a third metering pump, a fourth metering pump, and a fifth metering pump. The oil outlets of the first metering pump, the second metering pump, the third metering pump, the fourth metering pump, and the fifth metering pump are respectively connected to the oil inlets of a first solenoid valve 1, a second solenoid valve 2, a fifth solenoid valve 5, a sixth solenoid valve 6, and a seventh solenoid valve 7.

[0037] Further, the oil cylinder drive valve group includes 13 groups of oil cylinder drive valves connected in series in sequence, which respectively correspond to a large material folding oil cylinder 20, a fine material lifting oil cylinder 21, a fine material head folding oil cylinder 22, a feeding head adjusting oil cylinder 23, a front leg oil cylinder 24, a sieve box lifting oil cylinder 25, a feeding belt leg oil cylinder 26, a sieve box tail lifting oil cylinder 27, a transfer belt adjusting oil cylinder 28, an oversize material rotating oil cylinder 29, an oversize material frame lifting oil cylinder 30, a medium material folding oil cylinder 31, and an oversize material tie rod oil cylinder 32 one by one.

[0038] Further, the large material folding oil cylinder 20, the fine material lifting oil cylinder 21, the feeding head adjusting oil cylinder 23, the sieve box lifting oil cylinder 25, the feeding belt leg oil cylinder 26, the sieve box tail lifting oil cylinder 27, the oversize material frame lifting oil cylinder 30, and the medium material folding oil cylinder 31 are all arranged in pairs.

[0039] The present invention controls the overall machine actions of the crawler-type transfer screening station. Five groups of metering pumps supply oil to eight belt motors, two traveling motors, and twenty-one oil cylinders through seven solenoid valves on the crawler-type mobile screening station, and the solenoid valves are all controlled by a controller. The lifting fine material conveyor belt motor 9, the feeding conveyor belt motor 11, the feeding head conveyor belt motor 12, the transfer belt motor 13, the oversize material conveyor belt motor 14, the medium material conveyor belt motor 15, and the large material conveyor belt motor 16 belong to the belt motors. The belt motors, the traveling motors, and the hydraulic oil cylinders do not work simultaneously.

[0040] After the engine is started and there is no action, the solenoid valves are not energized, and the hydraulic oil directly returns to the oil tank through the right positions of the second solenoid valve 2 and the fifth solenoid valve 5 and the middle H positions of the third solenoid valve 3 and the fourth solenoid valve 4. When traveling, the second solenoid valve 2 and the fifth solenoid valve 5 are not energized, and the traveling motors are controlled through the left and right positions of the third solenoid valve 3 and the fourth solenoid valve 4 to make the machine complete forward, backward, and turning actions. When the belt is working, the first solenoid valve 1, the second solenoid valve 2, the fifth solenoid valve 5, and the sixth solenoid valve 6 are energized, and the right side of the seventh solenoid valve 7 is energized, and each belt motor is supplied with oil to work. The opening sequence of each solenoid valve is controlled by the controller. Among them, the lifting fine material conveyor belt motor 9 and the sieve box motor 10 are connected in series, the transfer belt motor 13 and the oversize material conveyor belt motor 14 are connected in series, and the medium material conveyor belt motor 15 and the large material conveyor belt motor 16 are connected in series.

[0041] When the oil cylinder needs to actuate, energize the left side of the seventh solenoid valve 7, and the oil cylinder pipeline is filled with oil. The three manual valves controlling the oil cylinder are connected in series to complete the actuation of 21 oil cylinders. Throttle orifices are installed on each oil cylinder to control the flow rate, ensuring stable actuation of the oil cylinders. The flow rate of the system is adjusted using the engine speed, reducing the use of flow dividers and lowering energy consumption.

[0042] Track-mounted mobile screening station: A mobile device that screens mixed materials into materials of various required particle sizes.

[0043] Electromagnetic directional valve: A valve element that uses electromagnetic control to achieve the flow, communication, and directional control of hydraulic oil.

[0044] Hydraulic pump: Driven by the engine, it is the power component of a hydraulic system that converts mechanical energy into hydraulic energy.

[0045] Hydraulic motor: The actuator of a hydraulic system that converts the hydraulic pressure energy provided by the hydraulic pump into the mechanical energy of its output shaft.

[0046] Hydraulic cylinder: A hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion.

[0047] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and all these changes and improvements fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

[0048] Where the present invention is not described in detail, it is common knowledge to those skilled in the art of this technology.

Claims

1. A novel crawler-type mobile screening station hydraulic system, comprising a first solenoid valve (1), a second solenoid valve (2), a third solenoid valve (3), a fourth solenoid valve (4), a fifth solenoid valve (5), a sixth solenoid valve (6), a seventh solenoid valve (7) and five sets of quantitative pumps (8), characterized in that: The five groups of metering pumps correspond to the five groups of solenoid valves in a one-to-one manner. A fine material conveyor belt motor (9) and a screen box motor (10) are arranged in series on a first working oil circuit between the first solenoid valve (1) and the oil tank (17). A feeding conveyor belt motor (11) is arranged in a second working oil circuit between the second solenoid valve (2) and the oil tank (17). A loading conveyor belt motor (12) is arranged in a third working oil circuit between the fifth solenoid valve (5) and the oil tank (17). A transfer belt motor (13) and an extra-large material conveyor belt motor (16) are arranged in series on a fourth working oil circuit between the sixth solenoid valve (6) and the oil tank (17). A medium material conveyor belt motor (15) and a large material conveyor belt motor (16) are arranged in series on a fifth working oil circuit between the seventh solenoid valve (7) and the oil tank (17). A plurality of groups of cylinder drive valve groups are arranged in series on a sixth working oil circuit between the seventh solenoid valve (7) and the oil tank (17).

2. According to claim 1, the novel crawler mobile screening station hydraulic system is characterized in that: The first solenoid valve (1), the second solenoid valve (2), the fifth solenoid valve (5) and the sixth solenoid valve (6) are all two-position four-way solenoid valves.

3. According to claim 2, the hydraulic system of the new crawler mobile screening station is characterized in that: A third solenoid valve (3) is arranged in series on the seventh working oil circuit between the second solenoid valve (2) and the left travel motor assembly (18); and a fourth solenoid valve (4) is arranged in series on the eighth working oil circuit between the fifth solenoid valve (5) and the right travel motor assembly (19).

4. According to claim 3, the novel crawler mobile screening station hydraulic system is characterized in that: The third solenoid valve (3), the fourth solenoid valve (4) and the seventh solenoid valve (7) are all three-position four-way solenoid valves.

5. According to claim 4, the novel crawler mobile screening station hydraulic system is characterized in that: The five groups of metering pumps (8) are respectively a first metering pump, a second metering pump, a third metering pump, a fourth metering pump and a fifth metering pump, wherein the oil outlets of the first metering pump, the second metering pump, the third metering pump, the fourth metering pump and the fifth metering pump are respectively connected to the oil inlets of the first solenoid valve (1), the second solenoid valve (2), the fifth solenoid valve (5), the sixth solenoid valve (6) and the seventh solenoid valve (7).

6. According to claim 5, the novel crawler mobile screening station hydraulic system is characterized in that: The cylinder drive valve group comprises 13 groups of cylinder drive valves connected in series, which correspond one by one to the large material folding cylinder (20), the fine material lifting cylinder (21), the fine material head folding cylinder (22), the feeding head adjustment cylinder (23), the front leg cylinder (24), the screen box lifting cylinder (25), the feeding belt leg cylinder (26), the screen box tail lifting cylinder (27), the transfer belt adjustment cylinder (28), the oversized material rotating cylinder (29), the oversized material frame lifting cylinder (30), the medium material folding cylinder (31), and the oversized material pull rod cylinder (32).

7. The novel crawler-type mobile screening station hydraulic system according to claim 6 is characterized in that: The large material folding cylinder (20), the fine material lifting cylinder (21), the feeding head adjustment cylinder (23), the screen box lifting cylinder (25), the feeding belt leg cylinder (26), the screen box tail lifting cylinder (27), the oversized material frame lifting cylinder (30) and the medium material folding cylinder (31) are all arranged in pairs.

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