Locking device and normally-open and normally-closed hydraulic cylinder using same

Abstract

The utility model discloses a locking device and normally open and normally closed type hydraulic cylinder using the locking device, which comprises a body, a rack rotation hydraulic cylinder and a gear shaft, the gear shaft penetrates through the interior of the body, a rack piston capable of reciprocating is arranged in the rack rotation hydraulic cylinder, the rack piston is meshed with the gear shaft, and the body comprises a barrel sleeved outside the gear shaft. A locking device is arranged between the cylinder and the gear shaft and comprises a friction plate set, the friction plate set comprises a movable friction plate with an inner ring provided with an inner key and a static friction plate with an outer ring provided with an outer key, an outer key groove is formed in the periphery of the upper portion of the gear shaft, an inner key groove is formed in the inner wall of the cylinder, and the gear shaft is in a stalling state when the movable friction plate and the static friction plate are pressed tightly. And when the movable friction plate is separated from the static friction plate, the gear shaft is in a rotatable state. By changing the state of the friction plate set, the normally-open locking mode and the normally-closed locking mode are achieved, multiple functions are integrated, and swing execution equipment can enter the locking state at any rotation angle.

Description

Technical Field

[0001] The utility model relates to the technical field of swing hydraulic cylinders, and particularly relates to a locking device and normally open and normally closed hydraulic cylinders using the locking device. Background Art

[0002] In modern large machinery, ships and other fields, swing actuators are increasingly widely used. Traditional swing actuators are facing the problem that the control of output torque, the control of rotation angle and the control of locking position cannot be integrated into the same actuator. This limits the versatility and integration of the actuator, and also increases the complexity and cost of the system. Therefore, there is an urgent need for an actuator that integrates multiple functions and has a compact structure.

[0003] Therefore, it is necessary to provide a locking device and normally open and normally closed hydraulic cylinders using the locking device to solve the above technical problems. Summary of the Invention

[0004] The purpose of the utility model is to provide a locking device and normally open and normally closed hydraulic cylinders using the locking device for the deficiencies of the existing technology, integrating multiple functions into one, so that the swing actuator can enter the locking state at any rotation angle.

[0005] To achieve the above purpose, the technical scheme adopted by the utility model is as follows:

[0006] A locking device includes a body, a rack rotary hydraulic cylinder, and a gear shaft. The gear shaft penetrates through the inside of the body. A rack piston with reciprocating displacement is arranged in the rack rotary hydraulic cylinder. The rack piston meshes with the gear shaft. The body includes a cylinder body sleeved outside the gear shaft. A locking device is arranged between the cylinder body and the gear shaft. The locking device includes a friction plate group. The friction plate group includes a dynamic friction plate with an inner key arranged on the inner circle and a static friction plate with an outer key arranged on the outer circle. An outer key groove is arranged on the outer circumference of the upper part of the gear shaft, and an inner key groove is arranged on the inner wall of the cylinder body. The inner key on the inner circle of the dynamic friction plate is slidably connected with the outer key groove of the gear shaft, and the outer key on the outer circle of the static friction plate is slidably connected with the inner key groove of the cylinder body. When the dynamic friction plate and the static friction plate are pressed together, the gear shaft is in a stopped rotation state. When the dynamic friction plate and the static friction plate are separated, the gear shaft is in a rotatable state.

[0007] Preferably, both ends of the rack rotary hydraulic cylinder are connected to a control valve group. A pressure sensor is arranged in the control valve group, and an accumulator is installed on the control valve group.

[0008] Preferably, a position proximity switch is arranged inside the cylinder body.

[0009] Preferably, an angle sensor is installed on the gear shaft.

[0010] An normally open hydraulic cylinder, the normally open hydraulic cylinder includes a locking device, and also includes a pressing plate, a brake piston, a top cover and a hydraulic valve. The lower end of the friction plate group abuts against the pressing plate, and the upper end of the friction plate group abuts against the brake piston. The dynamic friction plates and the static friction plates are arranged alternately. A top cover is provided at the top of the cylinder body. The outlet of the hydraulic valve penetrates through the top cover and contacts the upper end of the brake piston.

[0011] A normally closed hydraulic cylinder, the normally closed hydraulic cylinder includes a locking device, and also includes a pressing plate, a brake piston, a disc spring, a top cover and a hydraulic valve. The lower end of the friction plate group abuts against the pressing plate, and the upper end of the friction plate group abuts against the brake piston. The dynamic friction plates and the static friction plates are arranged alternately. A top cover is provided at the top of the cylinder body. A disc spring is provided between the top cover and the brake piston. The outlet end of the hydraulic valve penetrates through the cylinder body and contacts the lower end of the brake piston.

[0012] Preferably, the disc spring is formed by stacking a plurality of disc spring monomers.

[0013] Compared with the prior art, the present utility model has the following advantages:

[0014] Integrate the large torque output, rotation angle control and locking function onto the same actuator, reducing the complexity of the system and the manufacturing cost.

[0015] By changing the friction force between the static friction plate and the dynamic friction plate, switch the operating state of the actuator, and select the normally open or normally closed locking device according to the requirements of the usage scenario.

[0016] Adopt a cylinder body with a hollow design. Through the cooperation of the cylinder body, the friction plate group and the gear shaft, the whole device has a more compact structure and is easy to install.

[0017] Through the real-time monitoring of the angle sensor and the pressure sensor, realize the precise control of the rotation angle and the liquid pressure. Description of the Drawings

[0018] Figure 1 is a schematic structural diagram of the normally open hydraulic cylinder using this locking device;

[0019] Figure 2 is Figure 1 the top view of

[0020] Figure 3 is Figure 2 the sectional view taken along line A-A in

[0021] Figure 4 is Figure 1 the front view of

[0022] Figure 5 is Figure 4 the sectional view taken along line B-B in

[0023] Figure 6 It is a top view of a normally closed hydraulic cylinder using this locking device;

[0024] Figure 7 is Figure 6 The sectional view taken along line C-C in

[0025] Figure 8 It is a structural schematic diagram of the friction plate group;

[0026] Wherein, 1 - body, 2 - rack rotary hydraulic cylinder, 3 - gear shaft, 4 - rack piston, 5 - cylinder body, 6 - pressing plate, 7 - friction plate group, 701 - moving friction plate, 702 - static friction plate, 8 - brake piston, 9 - top cover, 10 - hydraulic valve, 11 - control valve group, 12 - accumulator, 13 - disc spring Specific embodiments

[0027] The following further clarifies the present invention in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. After reading the present invention, various equivalent modifications made by those skilled in the art to the present invention fall within the scope defined by the appended claims of this application.

[0028] In the present invention, unless otherwise clearly defined and limited, terms such as "installation", "setting", "connection", "fixed connection" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. It can be the communication inside two components or the interaction relationship between two components. Unless otherwise clearly limited, for those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In the present invention, terms such as "upper", "lower", "bottom", "top" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only relational terms determined for the convenience of describing the structural relationship of each component or element of the present invention, and do not specifically refer to any component or element in the present invention, and should not be construed as a limitation to the present invention.

[0030] Such as Figures 1 to 5 、 Figure 8As shown in the figure, a normally open hydraulic cylinder using this locking device includes a body 1, a rack rotary hydraulic cylinder 2, and a gear shaft 3. The gear shaft penetrates through the interior of the body. A reciprocating rack piston 4 is installed in the rack rotary hydraulic cylinder, and the rack piston meshes with the gear shaft. The body includes a cylinder 5 sleeved outside the gear shaft, and a locking device is installed inside the cylinder. The locking device includes a friction plate group. The friction plate group includes a dynamic friction plate with an inner key provided on the inner circle and a static friction plate with an outer key provided on the outer circle. The dynamic friction plates 701 and the static friction plates 702 are arranged alternately. An outer key groove is provided on the outer circumference of the upper part of the gear shaft, and an inner key groove is opened on the inner wall of the cylinder. The inner key on the inner circle of the dynamic friction plate is slidably connected with the outer key groove of the gear shaft, and the outer key on the outer circle of the static friction plate is slidably connected with the inner key groove of the cylinder. The lower end of the friction plate group abuts against the pressure plate 6, and the upper end of the friction plate group 7 abuts against the brake piston 8. A top cover 9 is provided at the top of the cylinder. The outlet of the hydraulic valve 10 penetrates through the top cover and contacts the upper end of the brake piston. When the dynamic friction plate and the static friction plate are pressed together, the gear shaft is in a stationary state, and when the dynamic friction plate and the static friction plate are separated, the gear shaft is in a rotatable state. Both ends of the rack rotary hydraulic cylinder are connected to a control valve group 11. A pressure sensor is installed in the control valve group, and an accumulator 12 is installed on the control valve group. The control valve group is mainly responsible for controlling the actions of the rack rotary hydraulic cylinder and the locking state of the locking device. The pressure sensor can monitor the liquid pressure states of the two action execution parts in real time. The accumulator can ensure that the locking device still maintains the braking effect under a long-term braking state. A position proximity switch is provided inside the cylinder to monitor in real time whether the locking device is in a braking state. An angle sensor is installed on the gear shaft to obtain the data of the rotation angle of the gear shaft in real time, so as to achieve precise control of the rotation angle.

[0031] As Figures 6 to 7As shown in the figure, it includes a body 1, a rack rotary hydraulic cylinder 2, and a gear shaft 3. The gear shaft penetrates through the interior of the body. A reciprocating displacement rack piston 4 is installed in the rack rotary hydraulic cylinder. The rack piston meshes with the gear shaft. The body includes a cylinder 5 sleeved outside the gear shaft. A locking device is installed in the cylinder. The locking device includes a friction plate group 7. The friction plate group includes a dynamic friction plate 701 with an inner key provided on the inner ring and a static friction plate 702 with an outer key provided on the outer ring. The dynamic friction plates and the static friction plates are arranged alternately. An outer key groove is provided on the outer periphery of the upper part of the gear shaft, and an inner key groove is provided on the inner wall of the cylinder. The inner key on the inner ring of the dynamic friction plate is slidably connected with the outer key groove of the gear shaft, and the outer key on the outer ring of the static friction plate is slidably connected with the inner key groove of the cylinder. The lower end of the friction plate group abuts against the pressure plate 6, and the upper end of the friction plate group abuts against the brake piston 8. A top cover is provided at the top of the cylinder. A disc spring 13 is installed between the top cover 9 and the brake piston. The disc spring is formed by stacking multiple disc spring monomers. The outlet end of the hydraulic valve 10 penetrates through the cylinder and contacts the lower end of the brake piston. When the dynamic friction plate and the static friction plate are pressed together, the gear shaft is in a stopped rotation state. When the dynamic friction plate and the static friction plate are separated, the gear shaft is in a rotatable state. Both ends of the rack rotary hydraulic cylinder are connected to a control valve group 11. A pressure sensor is installed in the control valve group. An accumulator 12 is installed on the control valve group. The control valve group is mainly responsible for controlling the actions of the rack rotary hydraulic cylinder and the locking state of the locking device. The pressure sensor can monitor the liquid pressure state of the two action execution parts in real time. The accumulator can ensure that the locking device still maintains the braking effect under a long-term braking state. A position proximity switch is provided inside the cylinder to monitor in real time whether the locking device is in a braking state. An angle sensor is installed on the gear shaft to obtain the data of the rotation angle of the gear shaft in real time, so as to achieve precise control of the rotation angle.

[0032] It should be noted that:

[0033] When the normally open hydraulic cylinder uses the locking device, the hydraulic valve abuts against the upper end of the brake piston. Under the action of hydraulic pressure, the brake piston moves closer to the friction plate group, increasing the friction force between the dynamic friction plate and the static friction plate, and the locking device is activated.

[0034] When the normally closed hydraulic cylinder uses the locking device, the hydraulic valve abuts against the lower end of the brake piston. When the hydraulic valve is not opened, the brake piston is pressed by the disc spring and applies pressure to the friction plate group, increasing the friction force between the dynamic friction plate and the static friction plate, and the locking device is in a braking state. When the hydraulic valve is opened, the brake piston moves away from the friction plate group under the action of hydraulic pressure, reducing the friction force between the dynamic friction plate and the static friction plate, releasing the braking state, and the gear shaft can rotate.

[0035] Principle and usage method of a normally open hydraulic cylinder using this locking device: Install the swing hydraulic cylinder on the component that needs to rotate, and connect it to the hydraulic system. Real-time monitor the flow rate and pressure of the hydraulic oil through a pressure sensor, and adjust the flow rate and pressure of the hydraulic oil through a control valve group. Start the hydraulic system to rotate the gear shaft. When the gear shaft does not need to be locked, the outer key of the static friction plate is fixed due to its cooperation with the inner keyway of the cylinder body and always remains stationary. The inner key of the moving friction plate is connected to the outer keyway of the gear shaft and rotates under the drive of the gear shaft. At this time, the swing oil cylinder can make any rotary motion. When the gear shaft needs to be locked, start the locking device, open the hydraulic valve, and the hydraulic oil pushes the upper end of the brake piston, making the brake piston press the friction plate group tightly. The static friction plate and the moving friction plate are closely attached to each other and cannot rotate relative to each other, finally stopping the rotation of the gear shaft and achieving the purpose of braking and locking.

[0036] Principle and usage method of a normally closed hydraulic cylinder using this locking device: Install the swing hydraulic cylinder on the component that needs to rotate, and connect it to the hydraulic system. Real-time monitor the flow rate and pressure of the hydraulic oil through a pressure sensor, and adjust the flow rate and pressure of the hydraulic oil through a control valve group. Start the hydraulic system to rotate the gear shaft. When the gear shaft does not need to be locked, open the hydraulic valve, and the hydraulic oil pushes the lower end of the brake piston. Under the action of the hydraulic pressure, the brake piston moves away from the friction plate group, reducing the friction force between the moving friction plate and the static friction plate. The moving friction plate is not affected by the static friction plate and rotates with the gear shaft. When the gear shaft needs to be locked, close the hydraulic valve, and the brake piston continuously applies pressure to the friction plate group under the pressure of the disc spring, increasing the friction force between the moving friction plate and the static friction plate, and the gear shaft stops rotating, achieving the purpose of braking and locking.

[0037] The above description shows and describes the preferred embodiments of the present invention. As mentioned above, it should be understood that the present invention is not limited to the form disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be changed within the scope of the inventive concept described herein through the above teachings or the technology or knowledge in related fields. And the changes and modifications made by those skilled in the art that do not depart from the spirit and scope of the present invention should all be within the protection scope of the appended claims of the present invention.

Claims

1. A locking device, comprising a body, a rack rotary hydraulic cylinder, and a gear shaft, wherein the gear shaft runs through the body, a rack piston is provided in the rack rotary hydraulic cylinder for reciprocating movement, and the rack piston is meshed with the gear shaft, characterized in that: The main body includes a cylinder sleeved on the outside of the gear shaft, a locking device is provided between the cylinder and the gear shaft, the locking device includes a friction plate group, the friction plate group includes a dynamic friction plate with an inner key on the inner ring and a static friction plate with an outer key on the outer ring, an outer key groove is provided on the outer periphery of the upper part of the gear shaft, an inner key groove is provided on the inner wall of the cylinder, the inner key of the inner ring of the dynamic friction plate is slidably connected with the outer key groove of the gear shaft, the outer key of the outer ring of the static friction plate is slidably connected with the inner key groove of the cylinder, the gear shaft is in a stopped state when the dynamic friction plate is pressed against the static friction plate, and the gear shaft is in a rotatable state when the dynamic friction plate is disengaged from the static friction plate.

2. A locking device according to claim 1, characterized in that: The two ends of the rack rotary hydraulic cylinder are connected to a control valve group, a pressure sensor is arranged in the control valve group, and an accumulator is installed on the control valve group.

3. A locking device according to claim 1, characterized in that: A position proximity switch is arranged in the cylinder.

4. A locking device according to claim 1, characterized in that: An angle sensor is installed on the gear shaft.

5. A normally open hydraulic cylinder, characterized in that: The normally open hydraulic cylinder includes a locking device as described in any one of claims 1 to 4, and also includes a pressure plate, a brake piston, a top cover and a hydraulic valve. The lower end of the friction plate group is in contact with the pressure plate, the upper end of the friction plate group is in contact with the brake piston, the dynamic friction plates and the static friction plates are alternately arranged, a top cover is provided on the top of the cylinder, and the outlet of the hydraulic valve passes through the top cover and is in contact with the upper end of the brake piston.

6. A normally closed hydraulic cylinder, characterized in that: The normally closed hydraulic cylinder includes a locking device as described in any one of claims 1 to 4, and also includes a pressure plate, a brake piston, a disc spring assembly, a top cover and a hydraulic valve. The lower end of the friction plate group is in contact with the pressure plate, the upper end of the friction plate group is in contact with the brake piston, the dynamic friction plates and the static friction plates are alternately arranged, a top cover is provided on the top of the cylinder, a disc spring assembly is provided between the top cover and the brake piston, and the outlet end of the hydraulic valve passes through the cylinder and is in contact with the lower end of the brake piston.

7. A normally closed hydraulic cylinder according to claim 6, characterized in that: The disc spring assembly is formed by stacking a plurality of disc spring monomers.

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