An oil supply system for an extrusion apparatus

Abstract

This invention discloses an oil supply system for extrusion equipment, comprising a locking oil circuit for supplying locking oil to the extrusion components, an auxiliary oil circuit for supplying oil to the hydraulic drive components, and a control oil circuit for controlling the connection between the locking oil circuit and the auxiliary oil circuit. The oil supply rate of the auxiliary oil circuit is greater than the oil supply rate of the locking oil circuit. The control oil circuit includes a compensation oil circuit for connecting the locking oil circuit and the auxiliary oil circuit, and a cartridge valve for controlling the on / off state of the compensation oil circuit. The two working ports of the cartridge valve are a locking oil port and an auxiliary oil port, respectively, to connect the locking oil circuit and the auxiliary oil circuit. The control port of the cartridge valve is used to connect to the locking oil circuit. Using this invention, the locking speed of the hydraulic cylinder can be increased, and the power requirements of the oil pump in the locking oil circuit can be reduced.

Description

Technical Field

[0001] This invention relates to the field of hydraulic equipment technology, and more particularly to an oil supply system for extrusion equipment. Background Technology

[0002] In existing hydraulic equipment, extrusion cylinders, extrusion rods, and other extrusion press components typically rely on independent locking oil circuits to provide locking fluid. For example, when the extrusion cylinder cylinder or the extrusion rod locking cylinder moves to the designated working position via a hydraulic control circuit, high-pressure locking fluid is injected into the cylinder through the locking oil circuit to achieve the position locking function of the extrusion components.

[0003] However, when the hydraulic cylinder begins to lock, the oil in the oil circuit and cylinder needs to be compressed, and the extrusion components will have a certain compression stroke during the cylinder's pressurization process. Therefore, a relatively large flow of locking oil is required to ensure the rapid locking of the extrusion components. For existing oil pumps, the higher the pumping pressure, the lower the oil supply rate, which limits the speed of cylinder locking. Summary of the Invention

[0004] The technical problem to be solved by the embodiments of the present invention is to provide an oil supply system for extrusion equipment, which can improve the locking speed of the oil cylinder and reduce the power requirements of the oil pump in the locking oil circuit.

[0005] To solve the above-mentioned technical problems, embodiments of the present invention provide an oil supply system for extrusion equipment, including a locking oil circuit for supplying locking oil to the extrusion component, an auxiliary oil circuit for supplying oil to the hydraulic drive component, and a control oil circuit for controlling the connection between the locking oil circuit and the auxiliary oil circuit, wherein the oil supply rate of the auxiliary oil circuit is greater than the oil supply rate of the locking oil circuit.

[0006] The control oil circuit includes a compensation oil circuit for connecting the locking oil circuit and the auxiliary oil circuit, and a cartridge valve for controlling the on / off state of the compensation oil circuit. The two working ports of the cartridge valve are a locking oil port and an auxiliary oil port, respectively, to connect the locking oil circuit and the auxiliary oil circuit. The control oil port of the cartridge valve is used to connect the locking oil circuit.

[0007] As an improvement to the above solution, an oil tank is also included. The locking oil circuit and the auxiliary oil circuit are respectively equipped with a locking oil pump and an auxiliary oil pump. Both the locking oil pump and the auxiliary oil pump are connected to the oil tank to draw hydraulic oil from the oil tank.

[0008] As an improvement to the above solution, a control valve group connected to the control port is also included, so that the control port can be selectively connected to the locking oil circuit or the auxiliary oil circuit.

[0009] The control valve assembly includes a selector valve and a control valve for changing the connection state of the selector valve.

[0010] The selector valve includes a selector valve body communicating with the control port and a valve core ball disposed within the selector valve body. The selector valve body has two selector ports that can be blocked by the valve core ball, for communicating with the control valve and the locking port respectively.

[0011] As an improvement to the above solution, the control valve includes a control valve body, a control valve core disposed within the control valve body, and a drive mechanism for driving the control valve core;

[0012] The control valve body is provided with an oil inlet connected to the auxiliary oil circuit, an oil return port connected to the oil tank, and a pilot oil port. The pilot oil port is connected to the selector port for connecting the control valve.

[0013] As an improvement to the above solution, the control valve core includes a normally closed valve core section for connecting the oil inlet port and the pilot oil port and an isobaric shut-off valve core section for connecting the pilot oil port and the return oil port, so as to change the oil circuit connection status in the control valve body by being driven by the drive mechanism.

[0014] As an improvement to the above solution, both the locking oil circuit and the auxiliary oil circuit are provided with a return oil pipe connected to the oil tank, and the return oil pipe is provided with an unloading valve for controlling the opening and closing of the return oil pipe.

[0015] As an improvement to the above solution, both the locking oil circuit and the auxiliary oil circuit are equipped with shut-off valves.

[0016] As an improvement to the above solution, the connection point between the return oil pipe and the auxiliary oil circuit is the auxiliary return oil point, the connection point between the pressure control valve and the locking oil circuit is the auxiliary pressure point, and the hydraulic oil in the oil tank flows through the auxiliary oil pump in sequence through the auxiliary pressure point, the shut-off valve of the auxiliary oil circuit and the auxiliary return oil point.

[0017] As an improvement to the above solution, the connection point between the return oil pipe and the locking oil circuit is the locking return oil point, and the connection point between the pressure control valve and the locking oil circuit is the locking pressure point. The hydraulic oil in the oil tank flows sequentially through the locking pressure point, the shut-off valve of the locking oil circuit, and the return oil point via the locking oil pump.

[0018] As an improvement to the above solution, both the locking oil circuit and the auxiliary oil circuit are equipped with pressure control valves to control the oil pressure of the locking oil circuit and the auxiliary oil circuit respectively.

[0019] Implementing this invention has the following beneficial effects:

[0020] This invention discloses an oil supply system for an extrusion device, including a locking oil circuit for supplying locking oil to the extrusion component, an auxiliary oil circuit for supplying oil to the hydraulic drive component, and a control oil circuit for controlling the connection between the locking oil circuit and the auxiliary oil circuit. The oil supply rate of the auxiliary oil circuit is greater than the oil supply rate of the locking oil circuit, so as to compensate for the problem of the initial low oil supply rate of the locking oil circuit through the auxiliary oil circuit.

[0021] Furthermore, the control oil circuit includes a compensation oil circuit for connecting the locking oil circuit and the auxiliary oil circuit, and a cartridge valve for controlling the on / off state of the compensation oil circuit. The two working ports of the cartridge valve are the locking oil port and the auxiliary oil port, respectively, to connect the locking oil circuit and the auxiliary oil circuit.

[0022] Therefore, when the control port is connected to the locking oil circuit, the oil pressure at the working port connected to the locking oil circuit is the same as the oil pressure at the top of the cartridge valve core. When the oil pressure at the working port connected to the locking oil circuit is lower than the oil pressure at the working port connected to the auxiliary oil circuit, the downward pressure exerted by the oil pressure on the top of the cartridge valve core is smaller than the combined force of the upward pressure exerted by the oil pressures at the two working ports on the bottom of the valve core. The valve core moves upward, and the auxiliary oil circuit connects with the locking oil circuit. This compensates for the slow initial locking speed of the locking oil circuit by utilizing the fast oil supply rate of the auxiliary oil circuit.

[0023] Similarly, when the oil pressure at the working port connected to the locking oil circuit is higher than the oil pressure at the working port connected to the auxiliary oil circuit, the valve core of the cartridge valve moves downward and closes, thereby automatically cutting off the connection between the auxiliary oil circuit and the locking oil circuit, so as to prevent the excessively high oil pressure in the locking oil circuit from affecting the normal operation of the auxiliary oil circuit during the later locking process. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the oil supply system of the present invention;

[0025] Figure 2 This is a schematic diagram of the oil supply system when the oil circuit of the equal pressure valve core section of the present invention is connected to the control valve body;

[0026] Figure 3 This is a schematic diagram of the oil supply system when the oil circuit of the normally closed valve core section of the present invention is connected to the control valve body;

[0027] Figure 4 yes Figure 3 A structural diagram of another state. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

[0029] See Figure 1This invention provides an oil supply system for an extrusion device, including a locking oil circuit 1 for supplying locking oil to the extrusion component, an auxiliary oil circuit 2 for supplying oil to the hydraulic drive component, and a control oil circuit for controlling the connection between the locking oil circuit 1 and the auxiliary oil circuit 2, wherein the oil supply rate of the auxiliary oil circuit 2 is greater than the oil supply rate of the locking oil circuit 1.

[0030] The control oil circuit includes a compensation oil circuit 3 for connecting the locking oil circuit 1 and the auxiliary oil circuit 2, and a cartridge valve 4 for controlling the opening and closing of the compensation oil circuit 3. The two working oil ports of the cartridge valve 4 are the locking oil port 41 and the auxiliary oil port 42, respectively, to connect the locking oil circuit 1 and the auxiliary oil circuit 2. The control oil port 43 of the cartridge valve 4 is used to connect the locking oil circuit 1.

[0031] Specifically, the embodiment of the present invention also includes an oil tank 5. The locking oil circuit 1 and the auxiliary oil circuit 2 are respectively provided with a locking oil pump 11 and an auxiliary oil pump 21. The locking oil pump 11 and the auxiliary oil pump 21 are both connected to the oil tank 5 to draw hydraulic oil from the oil tank 5.

[0032] It should be noted that the auxiliary oil circuit 2 is generally used to supply hydraulic oil to the hydraulic cylinders of the extrusion equipment. Therefore, the auxiliary oil pump 21 has a relatively lower oil supply pressure requirement compared to the locking oil pump 11, but a faster oil supply rate. The cartridge valve 4 is existing technology, and its structure and principle will not be described in detail here. It generally includes the valve body of the cartridge valve 4 and the valve core located within the valve body. The two working ports of the cartridge valve 4 are generally located below the bottom and to one side of the valve core, while the control port 43 is located above the top of the valve core. For ease of description, the working port located below the bottom of the valve core is designated C, the working port located to one side of the bottom of the valve core is designated D, and the control port 43 is designated K. That is, the locking port is designated D, and the auxiliary port is designated C. Corresponding letters are also used in the attached drawings for auxiliary labeling to simplify subsequent annotation lines.

[0033] When the control port 43 is connected to the locking oil circuit 1, the oil pressure at the locking port 41 is the same as the oil pressure at the top of the valve core of the cartridge valve 4. When the oil pressure at the locking port 41 is lower than the oil pressure at the auxiliary port 42, the downward pressure generated on the top of the valve core of the cartridge valve 4 is smaller than the combined force of the upward pressure generated on the bottom of the valve core by the two working ports. The valve core moves upward, and the auxiliary oil circuit 2 is connected to the locking oil circuit 1. The fast oil supply rate of the auxiliary oil circuit 2 is used to compensate for the slow locking speed of the locking oil circuit 1 in the early stage.

[0034] Similarly, when the oil pressure at the locking port 41 is higher than the oil pressure at the auxiliary port 42, the valve core of the cartridge valve 4 moves downward and closes, thereby automatically cutting off the connection between the auxiliary oil circuit 2 and the locking oil circuit 1, so as to prevent the excessively high oil pressure in the locking oil circuit 1 from affecting the normal operation of the auxiliary oil circuit 2 during the later locking process.

[0035] Further, see Figure 3 In order for users to actively disconnect the connection between the locking oil circuit 1 and the auxiliary oil circuit 2 according to actual needs, this embodiment of the invention also includes a control valve group connected to the control oil port 43, so that the control oil port 43 can select to connect to the locking oil circuit 1 or the auxiliary oil circuit 2.

[0036] The control valve assembly includes a selector valve 6 and a control valve for changing the connection state of the selector valve 6. The selector valve 6 includes a selector valve body 61 communicating with the control port 43 and a valve core ball 62 disposed within the selector valve body 61. The selector valve body 61 has two selector ports 63 that can be blocked by the valve core ball 62, for connecting the control valve and the locking port 41 respectively. For ease of description, these two selector ports 63 are denoted as E and F, respectively. The port of the selector valve body 61 for connecting the control port 43 is denoted as G, which is located between E and F. Corresponding letters are also used in the accompanying drawings for auxiliary identification to simplify subsequent annotation lines.

[0037] The control valve includes a control valve body, a control valve core disposed within the control valve body, and a drive mechanism for driving the control valve core. The control valve body has an inlet 71 communicating with the auxiliary oil circuit 2, an outlet 72 communicating with the oil tank 5, and a pilot outlet 73. A selector port 63 of the selector valve body, which is used to connect the control valve, is connected to the pilot outlet 73, i.e., the pilot outlet 73 is connected to the selector port 63 used to connect the control valve. The control valve core includes a normally closed valve core section 7a for connecting the inlet 71 and the pilot outlet 73, and an isobaric shut-off valve core section 7b for connecting the pilot outlet 73 and the outlet 72, so as to change the oil circuit connection status within the control valve body by being driven by the drive mechanism. For ease of description, the inlet 71, outlet 72, and pilot outlet 73 are respectively denoted as P, T, and A. Corresponding letters are also used for auxiliary identification in the accompanying drawings to simplify the annotation lines.

[0038] The control valve can be an electromagnetic control valve, which is the prior art. Its driving mechanism is correspondingly an electromagnetic drive mechanism to control the movement of the control valve core in the control valve body, so that the oil inlet 71, oil return 72 and pilot oil inlet 73 of the control valve body are connected to the oil circuit of the normally closed valve core section 7a or the oil circuit of the isobaric shut-off valve core section 7b.

[0039] Therefore, when the oil circuit of the isobaric shut-off valve core section 7b is connected to the oil inlet 71, oil return 72, and pilot oil port 73 of the control valve body, see [reference needed]. Figure 2A is connected to E. The hydraulic oil in E flows back to the oil tank 5 through T and releases its pressure, causing the pressure of F to be greater than the pressure of E. The valve core ball blocks E, thereby connecting D, F and G in sequence. That is, the control oil port 43 is connected to the locking oil circuit 1. At this time, the oil pressure of the locking oil port 41 is the same as the oil pressure at the top of the valve core of the cartridge valve 4.

[0040] Similarly, when the oil circuit of the normally closed valve core section is connected to the oil inlet 71, oil return 72, and pilot oil port 73 of the control valve body, see [reference needed]. Figure 3 C, P, A, and E are connected in sequence. When the oil pressure in auxiliary oil circuit 2 is greater than the oil pressure in locking oil circuit 1, the pressure E of the selector valve 6 is greater than the pressure F. The valve core ball blocks F, and C, P, A, E, and K are connected in sequence. That is, the downward pressure generated by the oil pressure at the control port 43 on the top of the valve core is greater than the resultant force of the upward pressure generated by the oil pressure at the two working ports on the bottom of the valve core. The valve core moves downward, and the two working ports are cut off by the valve core. Therefore, auxiliary oil circuit 2 is disconnected from locking oil circuit 1.

[0041] Accordingly, see Figure 4 When the oil pressure in auxiliary oil circuit 2 is less than the oil pressure in locking oil circuit 1, the pressure E of the selector valve 6 is less than the pressure F. The valve core ball blocks E, and D, F, G and K are connected in sequence. That is, the downward pressure generated by the oil pressure of the control port 43 on the top of the valve core is greater than the resultant force of the upward pressure generated by the oil pressure of the two working ports on the bottom of the valve core. The valve core moves downward, and the two working ports are cut off by the valve core. Therefore, the auxiliary oil circuit 2 and the locking oil circuit 1 are still disconnected.

[0042] Preferably, both the locking oil circuit 1 and the auxiliary oil circuit 2 are provided with a return oil pipe 8 connected to the oil tank 5. The return oil pipe 8 is provided with an unloading valve 81 for controlling the opening and closing of the return oil pipe, so as to release the hydraulic oil in the locking oil circuit 1 back to the oil tank 5 after the machine stops. Correspondingly, the hydraulic oil in the auxiliary oil circuit 2 can also be released back to the oil tank 5.

[0043] Both the locking oil circuit 1 and the auxiliary oil circuit 2 are equipped with shut-off valves 101. The hydraulic oil in the oil tank 5 flows through the corresponding shut-off valves 101 via the corresponding locking oil pump and the auxiliary oil pump to prevent the oil from back-impacting and damaging the locking oil pump and the auxiliary oil pump.

[0044] Both the locking oil circuit 1 and the auxiliary oil circuit 2 are equipped with pressure control valves 9 to control the oil pressure of the locking oil circuit 1 and the auxiliary oil circuit 2 respectively, so as to prevent the locking oil circuit 1 and the auxiliary oil circuit 2 from exceeding their respective preset working oil pressure limits. The pressure control valve 9 is preferably an overflow control valve.

[0045] The connection point between the return oil pipe and the auxiliary oil circuit 2 is the auxiliary return oil point, and the connection point between the pressure control valve 9 and the auxiliary oil circuit 2 is the auxiliary pressure point. The hydraulic oil in the oil tank 5 flows through the auxiliary oil pump 21 in sequence through the auxiliary pressure point, the shut-off valve of the auxiliary oil circuit 2, and the auxiliary return oil point.

[0046] The connection point between the return oil pipe and the locking oil circuit 1 is the locking return oil point, and the connection point between the pressure control valve 9 and the locking oil circuit 1 is the locking pressure point. The hydraulic oil in the oil tank 5 flows sequentially through the locking pressure point, the shut-off valve of the locking oil circuit 1, and the locking return oil point via the locking oil pump 11.

[0047] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A lubrication system for extrusion equipment, characterized in that, It includes a locking oil circuit for supplying locking oil to the extrusion component, an auxiliary oil circuit for supplying oil to the hydraulic drive component, and a control oil circuit for controlling the connection between the locking oil circuit and the auxiliary oil circuit, wherein the oil supply rate of the auxiliary oil circuit is greater than the oil supply rate of the locking oil circuit. The control oil circuit includes a compensation oil circuit for connecting the locking oil circuit and the auxiliary oil circuit, and a cartridge valve for controlling the on / off state of the compensation oil circuit. The two working ports of the cartridge valve are a locking port and an auxiliary port, respectively, to connect the locking oil circuit and the auxiliary oil circuit. The control port of the cartridge valve is used to connect the locking oil circuit. It also includes a control valve assembly connected to the control port, so that the control port can be selectively connected to the locking oil circuit or the auxiliary oil circuit; The control valve assembly includes a selector valve and a control valve for changing the connection state of the selector valve. The selector valve includes a selector valve body communicating with the control port and a valve core ball disposed within the selector valve body. The selector valve body has two selector ports that can be blocked by the valve core ball, for communicating with the control valve and the locking port respectively. The control valve includes a control valve body, a control valve core disposed within the control valve body, and a drive mechanism for driving the control valve core. The control valve core includes a normally closed valve core section for connecting the oil inlet to the pilot oil port and an isobaric shut-off valve core section for connecting the pilot oil port to the return oil port, so as to change the oil circuit connection status in the control valve body by being driven by the drive mechanism.

2. The oil supply system according to claim 1, characterized by It also includes an oil tank, and the locking oil circuit and the auxiliary oil circuit are respectively equipped with a locking oil pump and an auxiliary oil pump. Both the locking oil pump and the auxiliary oil pump are connected to the oil tank to draw hydraulic oil from the oil tank.

3. The oil supply system according to claim 2, characterized in that Both the locking oil circuit and the auxiliary oil circuit are equipped with return oil pipes that are connected to the oil tank, and the return oil pipes are equipped with unloading valves for controlling the opening and closing of the return oil pipes.

4. The oil supply system according to claim 3, characterized in that Both the locking oil circuit and the auxiliary oil circuit are equipped with shut-off valves.

5. The oil supply system according to claim 4, wherein Both the locking oil circuit and the auxiliary oil circuit are equipped with pressure control valves to control the oil pressure of the locking oil circuit and the auxiliary oil circuit respectively.

6. The oil supply system as described in claim 5, characterized in that, The connection point between the return oil pipe and the auxiliary oil circuit is the auxiliary return oil point, and the connection point between the pressure control valve and the auxiliary oil circuit is the auxiliary pressure point. The hydraulic oil in the oil tank flows sequentially through the auxiliary pressure point, the shut-off valve of the auxiliary oil circuit, and the auxiliary return oil point via the auxiliary oil pump.

7. The oil supply system as described in claim 5 or 6, characterized in that, The connection point between the return oil pipe and the locking oil circuit is the locking return oil point, and the connection point between the pressure control valve and the locking oil circuit is the locking pressure point. The hydraulic oil in the oil tank flows sequentially through the locking pressure point, the shut-off valve of the locking oil circuit, and the locking return oil point via the locking oil pump.

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