Compression ratio adjustable twin screw press

Abstract

The application provides a double-shaft presser with adjustable compression ratio, which solves the problem that a single screw presser cannot meet the pressing requirements of different materials. The pushing screw rod comprises a first screw rod and a second screw rod, the screw edges of the first screw rod and the second screw rod are arranged in an interlaced manner, a power element for driving the filter cover to move forward and backward is installed on the frame, and linear guide mechanisms are arranged on the two sides of the filter cover. The double screw rods can be sheared with each other to prevent the material from being stuck on the shaft, and the pressing efficiency is high. Meanwhile, the filter cover is driven by the power element to move forward and backward relative to the pushing screw rod, so that the compression ratio of the presser is changed, the presser is suitable for pressing different materials, and the universality is good.

Description

Technical Field

[0001] The present invention relates to the technical field of squeezers, and in particular to a double-shaft squeezer with adjustable compression ratio. Background Art

[0002] The function of a screw press is to increase the unit extrusion volume by changing the screw shaft diameter and blade pitch, thereby squeezing out the water in the pulp residue to increase its dryness and form a more solid state for the next process. Currently, the compression ratio parameters of traditional presses are fixed. However, due to the different materials that need to be squeezed for dehydration and solid-liquid separation, a single model of screw press is difficult to adapt to the diversity of materials. As a result, different materials need to be squeezed using presses with different compression ratios, which increases the cost of the enterprise. Summary of the Invention

[0003] In order to overcome the shortcomings of the background technology, the invention provides a twin-shaft press with an adjustable compression ratio, which solves the problem that a single screw press cannot meet the pressing requirements of different materials.

[0004] The technical solution adopted by the invention is as follows:

[0005] A twin-shaft press with an adjustable compression ratio includes a frame, a pusher screw arranged on the frame, a filter cover, and a driving mechanism for driving the pusher screw to rotate. The screw groove depth and thread pitch of the pusher screw gradually decrease along the direction of material movement. The pusher screw includes a No. 1 screw and a No. 2 screw. The screw ridges of the No. 1 screw and the No. 2 screw are arranged in an alternating manner. A power element for driving the filter cover to move back and forth is installed on the frame, and linear guide mechanisms are provided on both sides of the filter cover.

[0006] The linear guide mechanism includes a guide rod installed on the frame and a guide sleeve matched with the guide rod, the guide sleeve is connected to the filter cover, and the guide rod is installed with a protective sleeve.

[0007] The frame is provided with a slag outlet, and the bottom of the filter cover discharge end is provided with a guide plate that cooperates with the slag outlet. The guide plate includes a horizontally vertical baffle No. 1 and an inclined baffle No. 2, and the length of the No. 2 baffle is greater than the maximum distance the filter cover moves.

[0008] The filter cover is a single-layer structure, and the water hole of the filter cover is trumpet-shaped.

[0009] The driving mechanism includes a driving element, which is a hydraulic motor or an electric motor.

[0010] The power element is a hydraulic cylinder or an electric cylinder.

[0011] The driving element is a hydraulic motor, the power element is a hydraulic cylinder, the hydraulic cylinder is provided with a first hydraulic circuit, the hydraulic motor is provided with a second hydraulic circuit, the first hydraulic circuit and the second hydraulic circuit both comprise an oil tank, the first hydraulic circuit further comprises a first hydraulic pump and a first three-position four-way electromagnetic valve, the first three-position four-way electromagnetic valve comprises a first oil inlet, a first oil return, a first oil port and a second oil port, the first oil inlet is connected with the first hydraulic pump, the first oil return is communicated with the oil tank, the first oil port and the second oil port are respectively communicated with two oil holes of the hydraulic cylinder, the second hydraulic circuit further comprises a second hydraulic pump, a second three-position four-way electromagnetic valve, a pressure sensor and an overload valve, the second three-position four-way electromagnetic valve comprises a second oil inlet, a second oil return, a third oil port and a fourth oil port, the second oil inlet is connected with the second hydraulic pump, the second oil return is communicated with the oil tank, the third oil port and the fourth oil port are respectively communicated with two oil holes of the hydraulic motor.

[0012] The second oil return and the oil tank are sequentially provided with a cooler and an oil return filter.

[0013] The second oil inlet and the second oil return are provided with a pressure measuring assembly and an electromagnetic overflow valve.

[0014] The first oil port and the second oil port are respectively provided with a one-way throttle valve.

[0015] The beneficial effects of the application are:

[0016] The double screw rods can shear each other to prevent material from sticking to the shaft, and the squeezing efficiency is high, and the filter screen cover is driven by the power element to move forward and backward relative to the pushing screw rod, so as to change the compression ratio of the squeezing machine, which is suitable for squeezing different materials and has good versatility. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a schematic diagram of the application.

[0018] Figure 2 is a side view of the application.

[0019] Figure 3 is a cross-sectional view of part of the filter screen cover of the application.

[0020] Figure 4 is a schematic diagram of the hydraulic circuit of the application.

[0021] Figure 5 is a schematic diagram of the first three-position four-way electromagnetic valve of the application.

[0022] Figure 6 is a schematic diagram of the second three-position four-way electromagnetic valve of the application.

[0023] Frame 1, filter cover 2, No. 3 screw rod 1, No. 4 screw rod 2, power element 5, linear guide mechanism 6, guide rod 61, guide sleeve 62, protective sleeve 63, slag outlet 7, guide plate 8, No. 1 baffle 81, No. 2 baffle 82, drive element 9, oil tank 10, No. 1 hydraulic pump 11, No. 1 three-position four-way electromagnetic valve 12, No. 1 oil inlet P1, No. 1 oil return port T1, No. 1 oil port A1, No. 2 oil port B1, No. 2 hydraulic pump 13, No. 2 three-position four-way electromagnetic valve 14, No. 2 oil inlet P2, No. 2 oil return port T2, No. 3 oil port A2, No. 4 oil port B2, pressure sensor 15, overload valve 16, cooler 17, oil return filter 18, pressure measuring assembly 19, electromagnetic overflow valve 20, one-way throttle valve 21. DETAILED DESCRIPTION

[0024] The application will be further described below in conjunction with the drawings and examples:

[0025] In the example, as shown in Figure 1 , Figure 2 , the adjustable compression ratio double-shaft squeezer comprises a frame 1, a pushing screw rod arranged on the frame 1, a filter cover 2, and a driving mechanism for driving the pushing screw rod to rotate, the screw groove depth and thread pitch of the pushing screw rod gradually decrease along the material moving direction, the pushing screw rod comprises a No. 3 screw rod 1 and a No. 4 screw rod 2, the screw edges of the No. 3 screw rod 1 and the No. 4 screw rod 2 are arranged in an interlaced manner, the frame 1 is provided with a power element 5 for driving the filter cover 2 to move forward and backward, and the filter cover 2 is provided with linear guide mechanisms 6 on both sides. The double screw rods can shear each other to prevent the material from being stuck on the shaft, and the squeezer has high squeezer efficiency. Meanwhile, the filter cover 2 is driven by the power element 5 to move forward and backward relative to the pushing screw rod, so as to change the compression ratio of the squeezer, which is suitable for squeezer of different materials and has good versatility.

[0026] In the example, as shown in Figure 1 , Figure 2 , the linear guide mechanism 6 comprises a guide rod 61 arranged on the frame 1 and a guide sleeve 62 matched with the guide rod 61, the guide sleeve 62 is connected with the filter cover 2, and the guide rod 61 is provided with a protective sleeve 63. The protective sleeve 63 protects the guide rod 61 and prevents juice or particulate matter from adhering to the guide rod 61 to cause damage to the guide rod 61 or block the guide sleeve 62.

[0027] In the example, as shown in Figure 2As shown, the frame 1 is provided with a slag outlet 7, and a guide plate 8 is provided at the bottom of the discharge end of the filter cover 2 to cooperate with the slag outlet 7. The guide plate 8 includes a horizontally vertical first baffle 81 and an inclined second baffle 82. The length of the second baffle 82 is greater than the maximum movement distance of the filter cover 2. The slag outlet 7 is provided with a gap, and part of the guide plate 8 can enter the slag outlet 7 through the gap. When the discharge end of the filter cover 2 exceeds the liquid collection tank, the material squeezed out passes through the second baffle 82 and enters the liquid collection tank, while the first baffle 81 acts as a slag barrier.

[0028] In the embodiment, Figure 3 As shown, the filter cover 2 is a single-layer structure, and the water hole of the filter cover 2 is trumpet-shaped. Traditional filter covers use a double-layer structure, with a large-aperture outer mesh plate and a small-aperture screen plate. The screen plate is easily scratched by hard objects during the pressing process, requiring frequent replacement. However, the present application adopts a single-layer structure, and the plate is processed into the filter cover 2 using large-aperture and small-aperture drill bits in sequence, which facilitates installation and avoids frequent maintenance.

[0029] In this embodiment, the drive mechanism includes a drive element 9, which is a hydraulic motor or an electric motor; the power element 5 is a hydraulic cylinder or an electric cylinder. The drive mechanism also includes a gearbox connected to the drive element 9, and can be driven hydraulically or electrically according to customer needs.

[0030] In the embodiment, Figure 4 、 Figure 5 、 Figure 6As shown, the driving element 9 is a hydraulic motor, the power element 5 is a hydraulic cylinder, the hydraulic cylinder 5 is equipped with a No. 1 hydraulic circuit, the hydraulic motor 9 is equipped with a No. 2 hydraulic circuit, the No. 1 hydraulic circuit and the No. 2 hydraulic circuit both include an oil tank 10, the No. 1 hydraulic circuit also includes a No. 1 hydraulic pump 11 and a No. 1 three-position four-way solenoid valve 12, the No. 1 three-position four-way solenoid valve 12 includes a No. 1 oil inlet P1, a No. 1 oil return port T1, a No. 1 oil port A1, and a No. 2 oil port B1, the No. 1 oil inlet P1 is connected to the No. 1 hydraulic pump 11, the No. 1 oil return port T1 is connected to the oil tank 10 is connected, the No. 1 oil port A1 and the No. 2 oil port B1 are connected to the two oil holes of the hydraulic cylinder respectively, the No. 2 hydraulic circuit also includes a No. 2 hydraulic pump 13, a No. 2 three-position four-way solenoid valve 14, a pressure sensor 15 and an overload valve 16, the No. 2 three-position four-way solenoid valve 14 includes a No. 2 oil inlet P2, a No. 2 oil return port T2, a No. 3 oil port A2, and a No. 4 oil port B2, the No. 2 oil inlet P2 is connected to the No. 2 hydraulic pump 13, the No. 2 oil return port T2 is connected to the oil tank 10, and the No. 3 oil port A2 and the No. 4 oil port B2 are connected to the two oil holes of the hydraulic motor respectively. The No. 1 hydraulic circuit and the No. 2 hydraulic circuit are controlled by the control center. The control center controls the hydraulic cylinder to push the filter cover 2 to move smoothly. The pressure sensor 15 is a hydraulic sensor used to detect the hydraulic pressure in the No. 2 circuit. The overload valve 16 is used to protect the hydraulic motor to prevent the hydraulic motor from overloading. When the hydraulic pressure in the No. 2 hydraulic circuit exceeds the set pressure value, it means that the material in the press contains hard material (the material contains less water) and is difficult to extrude. The control center controls the push screw to speed up to facilitate the extrusion of hard materials and prevent the push screw from getting stuck; when the hydraulic pressure in the No. 2 hydraulic circuit is lower than the set pressure value, the control center controls the push screw to speed down so that the hydraulic pressure reaches a certain set value; when the hydraulic pressure in the No. 1 hydraulic circuit exceeds the set pressure value, the control center controls the hydraulic cylinder to drive the filter cover to move to the left, away from the discharge end, so that the compression ratio becomes smaller.

[0031] In the embodiment, Figure 4 As shown, a cooler 17 and an oil return filter 18 are sequentially provided between the second oil return port T2 and the oil tank 10. The first oil return port T1 is connected to the second oil return port T2 to cool and filter the hydraulic oil entering the oil tank 10 from the oil return port for easy recycling.

[0032] In the embodiment, Figure 4 As shown, a pressure measuring assembly 19 and an electromagnetic relief valve 20 are installed between the No. 2 oil inlet P2 and the No. 2 oil return port T2. Pressure measuring assembly 19 can be an electric contact pressure gauge. When the oil pressure in the No. 2 hydraulic circuit is too high, pressure measuring assembly 19 transmits a signal to the control center, which controls the electromagnetic relief valve 20 to open and relieve pressure. Of course, the No. 2 hydraulic circuit is also equipped with a pressure measuring assembly 19 and an electromagnetic relief valve 20.

[0033] In the embodiment, Figure 4 As shown, a one-way throttle valve 21 is provided between the No. 1 oil port A1, the No. 2 oil port B1 and the hydraulic cylinder. The one-way throttle valve is controlled by the control center to control the flow rate during the oil inlet and oil return process of the hydraulic cylinder to ensure that the filter cover 2 moves smoothly left and right.

[0034] Obviously, the above embodiments of the present invention are merely examples for the purpose of illustrating the present invention and are not intended to limit the implementation of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to provide an exhaustive list of implementations. However, obvious variations or modifications arising from the essence of the present invention remain within the scope of protection of the present invention.

Claims

1. A twin-shaft press with an adjustable compression ratio, comprising a frame (1), a push screw arranged on the frame (1), a filter screen (2), and a drive mechanism for driving the push screw to rotate, wherein the screw groove depth and the thread pitch of the push screw gradually decrease along the direction of material movement, and characterized in that: The pushing screw comprises a No. 1 screw (3) and a No. 2 screw (4), the screw ridges of the No. 1 screw (3) and the No. 2 screw (4) are arranged in a staggered manner, a power element (5) for driving the filter cover (2) to move forward and backward is installed on the frame (1), and linear guide mechanisms (6) are provided on both sides of the filter cover (2); The driving mechanism includes a driving element (9), the driving element (9) is a hydraulic motor, the power element (5) is a hydraulic cylinder, the hydraulic cylinder is equipped with a No. 1 hydraulic circuit, the hydraulic motor is equipped with a No. 2 hydraulic circuit, the No. 1 hydraulic circuit and the No. 2 hydraulic circuit both include an oil tank (10), the No. 1 hydraulic circuit also includes a No. 1 hydraulic pump (11) and a No. 1 three-position four-way solenoid valve (12), the No. 1 three-position four-way solenoid valve (12) includes a No. 1 oil inlet (P1), a No. 1 oil return port (T1), a No. 1 oil port (A1), and a No. 2 oil port (B1), the No. 1 oil inlet (P1) is connected to the No. 1 hydraulic pump (11), the No. 1 oil return port (T1) is connected to the oil tank (10), the No. 1 oil port (A1) and the No. 2 oil port (B1) are respectively connected to the two oil holes of the hydraulic cylinder, the No. 2 hydraulic circuit also includes a No. 2 hydraulic pump (13), a No. 2 three-position four-way solenoid valve (14), a pressure sensor (15) and an overload valve (16), the No. 2 three-position four-way solenoid valve (14) includes a No. 2 oil inlet (P2), a No. 2 oil return port (T2), a No. 3 oil port (A2), and a No. 4 oil port (B2), the No. 2 oil inlet (P2) is connected to the No. 2 hydraulic pump (13), the No. 2 oil return port (T2) is connected to the oil tank (10), and the No. 3 oil port (A2) and the No. 4 oil port (B2) are respectively connected to the two oil holes of the hydraulic motor; The frame (1) is provided with a slag outlet (7), and the bottom of the discharge end of the filter cover (2) is provided with a guide plate (8) that cooperates with the slag outlet (7), and the guide plate (8) includes a horizontally vertical baffle plate (81) and an inclined baffle plate (82), and the length of the second baffle plate (82) is greater than the maximum distance that the filter cover (2) moves.

2. The twin-shaft press with adjustable compression ratio according to claim 1, characterized in that: The linear guide mechanism (6) comprises a guide rod (61) mounted on the frame (1) and a guide sleeve (62) cooperating with the guide rod (61); the guide sleeve (62) is connected to the filter cover (2); and a protective sleeve (63) is mounted on the guide rod (61).

3. The twin-shaft press with adjustable compression ratio according to claim 1, characterized in that: The filter cover (2) is a single-layer structure, and the water hole of the filter cover (2) is trumpet-shaped.

4. The twin-shaft press with adjustable compression ratio according to claim 1, characterized in that: A cooler (17) and an oil return filter (18) are provided in sequence between the second oil return port (T2) and the oil tank (10).

5. The twin-shaft press with adjustable compression ratio according to claim 1, characterized in that: A pressure measuring assembly (19) and an electromagnetic overflow valve (20) are provided between the second oil inlet (P2) and the second oil return port (T2).

6. The twin-shaft press with adjustable compression ratio according to claim 1, characterized in that: A one-way throttle valve (21) is provided between the No. 1 oil port (A1), the No. 2 oil port (B1) and the hydraulic cylinder.

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