A hydraulic spring device

Abstract

The present invention relates to the technical field of hydraulic equipment, and discloses a hydraulic spring device. The hydraulic spring device comprises a spring actuator and an electromagnetic reversing valve, the spring actuator comprises a cylinder body, two pistons and two connecting rods, a cavity is arranged inside the cylinder body, the two pistons are slidably matched in the cavity, and the cavity is divided into a first oil chamber, a second oil chamber and a third oil chamber, the second oil chamber is arranged between the first oil chamber and the third oil chamber, the two connecting rods are respectively connected to a piston, and one end of the connecting rod away from the piston extends out of the cylinder body and is used to connect an external workpiece, the P port of the electromagnetic reversing valve is connected to the oil source, the T port of the electromagnetic reversing valve is connected to the oil tank, the first oil chamber and the third oil chamber are both connected to the A port of the electromagnetic reversing valve, and the second oil chamber is connected to the B port of the electromagnetic reversing valve. The hydraulic spring device provided by the present invention has a small volume, a compact structure, and is more flexible in use, and can be used for compression springs, and can also be used for tension springs.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic equipment, and in particular to a hydraulic spring device. Background Art

[0002] The hydraulic spring devices in the prior art generally use mechanical springs, which often have some disadvantages during application. For example, a spring has only one usage, that is, it can only achieve tension or pressure, and its usage is relatively simple and its versatility is low.

[0003] Therefore, it is urgent to invent a hydraulic spring device to solve the above problems. Summary of the invention

[0004] Based on the above, the purpose of the present invention is to provide a hydraulic spring device, which is flexible in usage and can be used for compression springs as well as for tension springs, and is suitable for heavy-load conditions.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A hydraulic spring device, comprising:

[0007] A spring actuator, comprising a cylinder, two pistons and two connecting rods, wherein a cavity is arranged inside the cylinder, the two pistons are slidably fitted in the cavity, and the cavity is divided into a first oil cavity, a second oil cavity and a third oil cavity, the second oil cavity is arranged between the first oil cavity and the third oil cavity, the two connecting rods are respectively connected to one of the pistons, and one end of the connecting rod away from the piston extends out of the cylinder and is used to connect an external workpiece;

[0008] An electromagnetic reversing valve, wherein the P port of the electromagnetic reversing valve is connected to the oil source, the T port of the electromagnetic reversing valve is connected to the oil tank, the first oil chamber and the third oil chamber are both connected to the A port of the electromagnetic reversing valve, and the second oil chamber is connected to the B port of the electromagnetic reversing valve.

[0009] As a preferred solution of the hydraulic spring device, the hydraulic spring device further comprises a solenoid valve, one end of which is connected to the oil source, and the other end of which is connected to the oil tank.

[0010] As a preferred solution of the hydraulic spring device, a one-way valve is provided between the P port of the electromagnetic reversing valve and the oil source, and the oil outlet of the one-way valve is connected to the P port of the electromagnetic reversing valve.

[0011] As a preferred solution of the hydraulic spring device, an overflow valve is further provided between the one-way valve and the P port of the electromagnetic reversing valve, and the outlet of the overflow valve is connected to the oil tank.

[0012] As a preferred solution of the hydraulic spring device, a throttle valve is further provided between the one-way valve and the P port of the electromagnetic reversing valve, and the outlet of the throttle valve is communicated with the oil tank.

[0013] As a preferred solution of the hydraulic spring device, the first oil chamber and the second oil chamber, and the second oil chamber and the third oil chamber are sealed by a sealing member.

[0014] As a preferred solution of the hydraulic spring device, the first oil chamber and the third oil chamber are connected through a connecting pipe.

[0015] As a preferred solution of the hydraulic spring device, the spring actuator further comprises a pressure sensor, and the pressure sensor is used to detect the pressure or tension on the two connecting rods.

[0016] As a preferred solution of the hydraulic spring device, the hydraulic spring device further comprises an accumulator, which is connected to the spring actuator and is used to adjust the elastic coefficient of the spring actuator and maintain the load of the spring actuator.

[0017] As a preferred solution of the hydraulic spring device, the electromagnetic reversing valve is a three-position four-way valve.

[0018] The beneficial effects of the present invention are:

[0019] The present invention provides a hydraulic spring device, which comprises a spring actuator and an electromagnetic reversing valve. The spring actuator comprises a cylinder body, two pistons and two connecting rods. The two pistons divide the cavity of the cylinder body into a first oil cavity, a second oil cavity and a third oil cavity. The P port of the electromagnetic reversing valve is connected to an oil source, the T port of the electromagnetic reversing valve is connected to an oil tank, the first oil cavity and the third oil cavity are both connected to the A port of the electromagnetic reversing valve, and the second oil cavity is connected to the B port of the electromagnetic reversing valve. In actual use, when the hydraulic spring device is subjected to the pressure of an external workpiece, the working position of the electromagnetic reversing valve is the right position, and the pressure oil flowing out of the oil source enters the second oil chamber through the P port and the B port of the electromagnetic reversing valve, and the pressure oil in the first oil chamber and the third oil chamber flows into the oil tank through the A port and the T port of the electromagnetic reversing valve, thereby realizing the extension of the two connecting rods; when the hydraulic spring device is subjected to the pulling force of the external workpiece, the working position of the electromagnetic reversing valve is the left position, and the pressure oil flowing out of the oil source enters the first oil chamber and the third oil chamber through the P port and the A port of the electromagnetic reversing valve, and the pressure oil in the second oil chamber flows into the oil tank through the B port and the T port of the electromagnetic reversing valve, thereby realizing the retraction of the two connecting rods. By setting the electromagnetic reversing valve, the two connecting rods can realize the spring function. The hydraulic spring device provided by the present invention has a small volume, a compact structure, and is more flexible in usage. It can be used for compression springs and can also be used for tension springs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0021] Figure 1 It is a structural schematic diagram of the hydraulic spring device provided by the present invention;

[0022] Figure 2 It is a left side view of the hydraulic spring device provided by the present invention;

[0023] Figure 3 It is a principle diagram of the hydraulic spring device provided by the present invention.

[0024] In the figure:

[0025] 100-Oil source; 200-Oil tank;

[0026] 1-spring actuator; 11-cylinder body; 111-first oil chamber; 112-second oil chamber; 113-third oil chamber; 12-piston; 13-connecting rod; 14-pressure sensor;

[0027] 2-base; 3-electromagnetic reversing valve; 4-check valve; 5-solenoid valve; 6-throttle valve; 7-overflow valve; 8-seal; 9-accumulator; 10-connecting pipe; 20-guide ring; 30-dust ring. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0029] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0031] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0032] like Figure 1-Figure 2 As shown, the present embodiment provides a hydraulic spring device, which includes a spring actuator 1 and an electromagnetic reversing valve 3, wherein the spring actuator 1 includes a cylinder body 11, two pistons 12 and two connecting rods 13, a cavity is arranged inside the cylinder body 11, the two pistons 12 are slidably matched in the cavity inside the cylinder body 11, and the cavity is divided into a first oil chamber 111, a second oil chamber 112 and a third oil chamber 113, the second oil chamber 112 is arranged between the first oil chamber 111 and the third oil chamber 113, the two connecting rods 13 are respectively connected to one piston 12, and one end of the connecting rod 13 away from the piston 12 extends out of the cylinder body 11 and is used to connect an external workpiece to withstand the tension or pressure of the external workpiece, the P port of the electromagnetic reversing valve 3 is connected to the oil source 100, the T port of the electromagnetic reversing valve 3 is connected to the oil tank 200, the first oil chamber 111 and the third oil chamber 113 are both connected to the A port of the electromagnetic reversing valve 3, and the second oil chamber 112 is connected to the B port of the electromagnetic reversing valve 3. Preferably, the electromagnetic reversing valve 3 is a three-position four-way valve, the three positions are the initial position, the left position and the right position, and the four oil ports are the power oil port P, the unloading oil port T, and the working oil ports A and B.

[0033] Combination Figure 3In actual use, when the hydraulic spring device is subjected to the pressure of the external workpiece, the working position of the electromagnetic reversing valve 3 is the right position, the pressure oil flowing out of the oil source 100 enters the second oil chamber 112 through the P port and the B port of the electromagnetic reversing valve 3, and the pressure oil in the first oil chamber 111 and the third oil chamber 113 flows into the oil tank 200 through the A port and the T port of the electromagnetic reversing valve 3, thereby realizing the extension of the two connecting rods 13; when the hydraulic spring device is subjected to the pulling force of the external workpiece, the working position of the electromagnetic reversing valve 3 is the left position, the pressure oil flowing out of the oil source 100 enters the first oil chamber 111 and the third oil chamber 113 through the P port and the A port of the electromagnetic reversing valve 3, and the pressure oil in the second oil chamber 112 flows into the oil tank 200 through the B port and the T port of the electromagnetic reversing valve 3, thereby realizing the retraction of the two connecting rods 13. The hydraulic spring device provided in this embodiment has a small size, a compact structure, and is more flexible in use. It can be used for compression springs and can also be used for tension springs.

[0034] Preferably, the first oil chamber 111 and the third oil chamber 113 are connected through the connecting pipe 10, which can facilitate the simultaneous oil inflow and outflow of the first oil chamber 111 and the third oil chamber 113, ensuring that the pressure in the first oil chamber 111 and the third oil chamber 113 is equal.

[0035] In order to prevent the pressure oil in the second oil chamber 112 from directly flowing into the first oil chamber 111 and the third oil chamber 113, or the pressure oil in the first oil chamber 111 and the third oil chamber 113 from directly flowing into the second oil chamber 112, the first oil chamber 111 and the second oil chamber 112, and the second oil chamber 112 and the third oil chamber 113 are sealed by a seal 8. Preferably, the seal 8 is made of rubber, and the seal 8 is sleeved on the piston 12.

[0036] Preferably, guide rings 20 are provided in the cavities at both ends of the cylinder body 11 , and the connecting rods 13 are respectively inserted into the corresponding guide rings 20 . The guide rings 20 guide the movement process of the connecting rods 13 extending or retracting into the cylinder body 11 .

[0037] Preferably, dust rings 30 are provided at both ends of the cylinder body 11. The dust rings 30 can prevent the extended connecting rod 13 from bringing dust into the cavity of the cylinder body 11 when it is retracted into the cylinder body 11, causing contamination of the pressure oil and affecting the normal use of the pressure oil.

[0038] Furthermore, the hydraulic spring device also includes a base 2, and the cylinder body 11 is arranged on the base 2. Specifically, Figure 1-Figure 2As shown, the cylinder body 11 includes a first cylinder body and a second cylinder body, each of which is provided with a first through hole, one end of which is provided with an internal thread, and the base 2 is provided with an external thread, the first cylinder body and the second cylinder body are respectively provided on both sides of the base 2, and are both threadedly connected to the base 2, a second through hole is provided inside the base 2, and the first through hole and the second through hole are interconnected for the circulation of pressure oil.

[0039] Furthermore, if Figure 1-Figure 3 As shown, the hydraulic spring device further includes a solenoid valve 5, one end of which is connected to the oil source 100, and the other end is connected to the oil tank 200. When the hydraulic spring device is in a working gap or a standby state, the solenoid valve 5 is located as shown in FIG. Figure 3 In the working position shown, the pressure in the oil source 100 is the same as that in the oil tank 200, and the spring actuator 1 has no energy loss. In this way, the hydraulic spring device has the advantages of energy saving and environmental protection.

[0040] Furthermore, a one-way valve 4 is provided between the P port of the electromagnetic reversing valve 3 and the oil source 100, and the oil outlet of the one-way valve 4 is connected to the P port of the electromagnetic reversing valve 3. By providing the one-way valve 4, it can be ensured that the pressure oil can only flow from the oil source 100 into the P port of the electromagnetic reversing valve 3, but cannot flow from the P port of the electromagnetic reversing valve 3 into the oil source 100, which is used for load maintenance of the spring actuator 1.

[0041] Furthermore, a relief valve 7 and a throttle valve 6 are also provided between the one-way valve 4 and the P port of the electromagnetic reversing valve 3. The outlet of the relief valve 7 is connected to the oil tank 200, and the outlet of the throttle valve 6 is connected to the oil tank 200. By providing the relief valve 7, the pressure of the oil circuit between the oil source 100 and the spring actuator 1 can be adjusted to keep it within the preset pressure range. When the pressure of the oil circuit between the oil source 100 and the spring actuator 1 is greater than the maximum value of the preset pressure range, the relief valve 7 is opened, and part of the pressure oil can be introduced into the oil tank 200 to restore the pressure to the preset pressure range. By providing the throttle valve 6, when the hydraulic spring device stops working, if there is still pressure oil in the oil circuit between the one-way valve 4 and the P port of the electromagnetic reversing valve 3, the throttle valve 6 is opened, and the pressure oil in the oil circuit between the one-way valve 4 and the P port of the electromagnetic reversing valve 3 can be introduced into the oil tank 200. Preferably, the throttle valve 6 is a needle valve.

[0042] Furthermore, the spring actuator 1 also includes a pressure sensor 14, which is used to detect the pressure or tension on the two connecting rods 13. During the use of the hydraulic spring device, the pressure sensor 14 can display the working pressure of the spring actuator 1 in real time, which is convenient for operators to track in real time.

[0043] Preferably, the hydraulic spring device further comprises an accumulator 9, which is connected to the spring actuator 1 and is used to adjust the elastic coefficient of the spring actuator 1 and maintain the load of the spring actuator 1. By connecting accumulators 9 of different specifications to the spring actuator 1, the elastic coefficient of the hydraulic spring device can be adjusted.

[0044] By setting the pressure sensor 14 and the accumulator 9, the operator can set the working pressure range of the spring actuator 1 according to the actual use environment, and the cooperation of the pressure sensor 14 and the accumulator 9 can realize the automatic loading of the spring actuator 1. For example: the operator sets the working pressure range of the pressure sensor 14 to F1-F2, where F1 is the minimum working pressure of the spring actuator 1, and F2 is the maximum working pressure of the spring actuator 1. When the actual working pressure F of the spring actuator 1 is less than F1, the solenoid valve 5 is energized, and the oil source 100 compensates the pressure of the accumulator 9, so that the actual working pressure F of the spring actuator 1 is greater than F1; when the actual working pressure F of the spring actuator 1 is greater than F2, the solenoid valve 5 loses power, the oil source 100 is unloaded, and the pressure compensation is stopped, so that the actual working pressure F of the spring actuator 1 is less than F2, thereby realizing that the actual working pressure F of the spring actuator 1 is always at F1<F<F2.

[0045] In this embodiment, the accumulator 9 is used to adjust the elastic coefficient of the spring actuator 1, and the magnitude of the output force of the connecting rod 13 is limited by the relief valve 7. The hydraulic spring device provided in this embodiment can also be used in various experimental equipment tests and other occasions requiring constant output force. When the stroke of the connecting rod 13 is compressed, the pressure tends to increase. At this time, the pressure of the connecting rod 13 can be kept unchanged by unloading the relief valve 7, thereby realizing the working condition that the spring stroke changes but the force remains unchanged.

[0046] The hydraulic spring device provided in this embodiment has a compact structure, the output force can be adjusted, can be precisely controlled, is not affected by stroke changes, and can be applied to heavy-load conditions. In addition, the hydraulic spring device is flexible in usage and can be used for compression springs or tension springs.

[0047] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A hydraulic spring device, characterized in that: include: A spring actuator (1) comprises a cylinder body (11), two pistons (12) and two connecting rods (13); a cavity is arranged inside the cylinder body (11); the two pistons (12) are slidably fitted in the cavity and the cavity is divided into a first oil cavity (111), a second oil cavity (112) and a third oil cavity (113); the second oil cavity (112) is arranged between the first oil cavity (111) and the third oil cavity (113); the two connecting rods (13) are respectively connected to one of the pistons (12); and one end of the connecting rod (13) away from the piston (12) extends out of the cylinder body (11) and is used to connect to an external workpiece; an electromagnetic reversing valve (3), wherein a P port of the electromagnetic reversing valve (3) is connected to an oil source (100), a T port of the electromagnetic reversing valve (3) is connected to an oil tank (200), the first oil chamber (111) and the third oil chamber (113) are both connected to an A port of the electromagnetic reversing valve (3), and the second oil chamber (112) is connected to a B port of the electromagnetic reversing valve (3); The hydraulic spring device further comprises a solenoid valve (5), one end of the solenoid valve (5) being connected to the oil source (100) and the other end of the solenoid valve (5) being connected to the oil tank (200); The spring actuator (1) further comprises a pressure sensor (14), wherein the pressure sensor (14) is used to detect the pressure or tension on the two connecting rods (13); The hydraulic spring device further comprises an accumulator (9), wherein the accumulator (9) is connected to the spring actuator (1) and is used to adjust the elastic coefficient of the spring actuator (1) and maintain the load of the spring actuator (1); A one-way valve (4) is provided between the P port of the electromagnetic reversing valve (3) and the oil source (100), and the oil outlet of the one-way valve (4) is connected to the P port of the electromagnetic reversing valve (3); A relief valve (7) is also provided between the one-way valve (4) and the P port of the electromagnetic reversing valve (3), and the outlet of the relief valve (7) is in communication with the oil tank (200).

2. The hydraulic spring device according to claim 1, characterized in that: A throttle valve (6) is also provided between the one-way valve (4) and the P port of the electromagnetic reversing valve (3), and the outlet of the throttle valve (6) is in communication with the oil tank (200).

3. The hydraulic spring device according to claim 1, characterized in that: The first oil chamber (111) and the second oil chamber (112), as well as the second oil chamber (112) and the third oil chamber (113) are sealed by a sealing element (8).

4. The hydraulic spring device according to claim 1, characterized in that: The first oil chamber (111) and the third oil chamber (113) are connected via a connecting pipe (10).

5. The hydraulic spring device according to any one of claims 1 to 4, characterized in that: The electromagnetic reversing valve (3) is a three-position four-way valve.

Images