Anti-impact electro-hydraulic integrated heavy-load electric cylinder

Abstract

An anti-impact electro-hydraulic integrated heavy-load electric cylinder comprises an electric cylinder body, a floating cylinder body, a buffering cylinder body and a floating piston, a first cavity is formed between the cylinder bottom of the floating cylinder body and the inner bottom of the buffering cylinder body, a second cavity is formed between the inner bottom of the floating cylinder body and the floating piston, and a third cavity is formed between the floating piston and the cylinder bottom of the electric cylinder body. A through hole communicated with the first cavity and the second cavity is formed in the cylinder bottom of the floating cylinder body, the first cavity and the second cavity are filled with a first liquid medium, the third cavity is filled with a second liquid medium, and a first safety valve communicated with the first cavity is installed on the side wall of the cylinder bottom of the buffering cylinder body. A second safety valve communicating with the third cavity is installed on the side wall of the top end of the floating cylinder body. According to the utility model, the overload protection problem of the electric cylinder in application scenes with high-speed impact and frequent impact can be solved, and the application range of the electric cylinder, especially the application of underground coal mine equipment and open-pit excavation equipment, can be greatly expanded.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of coal mine fully mechanized mining equipment, and more particularly to an anti-impact electro-hydraulic integrated heavy load electric cylinder, which can effectively solve the anti-impact problem of heavy load electric cylinders used in underground coal mine equipment or open pit mining equipment, thereby replacing the hydraulic cylinders in coal mine fully mechanized mining equipment. BACKGROUND

[0002] China is rich in coal resources and has a wide distribution, ranking first in the world in terms of coal production. The application of hydraulic cylinders in coal mine fully mechanized mining equipment is very large, while electric cylinders have the following advantages compared to hydraulic cylinders:

[0003] (1) Environmentally friendly and energy efficient: no need for hydraulic oil, reducing pollution risks;

[0004] (2) Low noise operation: suitable for environments with strict noise requirements;

[0005] (3) High precision control: precise position, speed and thrust control through encoder feedback;

[0006] (4) Good synchronization: capable of simultaneously driving multiple push rods for synchronized movement.

[0007] Therefore, in recent years, hydraulic cylinders in coal mine fully mechanized mining equipment are gradually being replaced by electric cylinders to meet the needs of electrification of coal mining.

[0008] However, electric cylinders are a type of device that uses a motor to drive a gear to rotate a lead screw, and then converts the rotational motion into linear motion through the lead screw threads. It is a mechanical structure transmission, and its anti-impact capability is mainly protected by mechanical friction torque limiter for overload protection. The anti-impact capability is poor, and frequent overload can cause overheating and failure, making it difficult to use in coal mine underground equipment with high impact and frequent impact.

[0009] Chinese invention patent CN117254632B discloses a mechanical overload device for servo electric cylinder, which adjusts the pushing speed and thrust of the electric cylinder by mechanical structure, reasonably matches the pushing force and speed, prevents overload, and improves the pushing efficiency. It solves the problem of reasonable matching of pushing force and speed. The mechanical overload device for servo electric cylinder does not consider the scenario of high impact and frequent impact. For high-speed impact overload protection, it is not good for high-speed impact equipment such as coal mine underground equipment or open pit mining equipment, which is prone to mechanical strength failure and cannot solve the problem of electric cylinder overload protection in high-speed impact and frequent impact application scenarios.

[0010] In summary, the existing electric cylinder has the following shortcomings:

[0011] (1) Overload protection under extreme high-speed impact cannot be effectively solved or is unreliable;

[0012] (2) the use scene exists the overload protection effect of frequent impact working condition is not good.

[0013] In order to solve the above problems, people have been seeking an ideal technical solution. SUMMARY

[0014] The utility model discloses to the shortage of prior art, to provide a kind of anti-impact electro-hydraulic integrated heavy load electric cylinder, the utility model can solve the electric cylinder overload protection problem of the application scene of existing high-speed impact and frequent impact, can greatly expand the application range of electric cylinder, especially the application of coal mine underground equipment and open pit mining equipment, realize effective overload protection while fully utilizing the characteristics of simple electric cylinder control system, high-precision easy control.

[0015] In order to achieve the above object, the technical scheme adopted by the utility model is: an anti-impact electro-hydraulic integrated heavy load electric cylinder, comprising an electric cylinder body, an integrated overload protection device is arranged at the bottom of the electric cylinder body, the integrated overload protection device comprises a floating cylinder body, a buffer cylinder body and a floating piston, the floating cylinder body is coaxially and sealingly slidingly inserted into the buffer cylinder body, a guide sleeve is fixedly installed in the cylinder port of the buffer cylinder body and sleeved on the outer circumference of the floating cylinder body, the top end of the floating cylinder body is fixedly connected to the bottom of the electric cylinder body, the floating piston is sealingly and slidingly installed in the floating cylinder body, a first cavity is formed between the bottom of the floating cylinder body and the inner bottom of the buffer cylinder body, a second cavity is formed between the inner bottom of the floating cylinder body and the floating piston, a third cavity is formed between the floating piston and the bottom of the electric cylinder body, a through hole is arranged at the bottom of the floating cylinder body and communicates with the first cavity and the second cavity, the first cavity and the second cavity are filled with a first liquid medium, the third cavity is filled with a second liquid medium, a first safety valve is installed on the side wall of the bottom of the buffer cylinder body and communicates with the first cavity, a second safety valve is installed on the top end of the floating cylinder body and communicates with the third cavity, the compression coefficient of the first liquid medium is less than that of the second liquid medium, and the threshold value of the first safety valve is less than that of the second safety valve.

[0016] Based on the above, the through hole is arranged at the center of the bottom of the floating cylinder body.

[0017] Based on the above, the side wall of the buffer cylinder body is provided with a first one-way liquid supplementing port communicating with the first cavity.

[0018] Based on the above, the side wall of the floating cylinder body is provided with a second one-way liquid supplementing port communicating with the third cavity.

[0019] Based on the above, the electric cylinder body mainly comprises a driving motor, a speed reducer, a torque limiter, a gear box, a first-stage ball screw telescopic cylinder and a second-stage ball screw telescopic rod, and the floating cylinder body is coaxially and fixedly arranged at the bottom of the first-stage ball screw telescopic cylinder.

[0020] The utility model discloses relative prior art has substantial characteristics and progress, specifically speaking, the utility model discloses a integral overload protection device is arranged at the cylinder bottom of electric cylinder body, and the integral overload protection device utilizes liquid balance protection principle to carry out overload protection to heavy load electric cylinder, can realize two-stage overload protection effect: for high frequency impact, because of the self-balancing shock absorption of liquid, the first liquid medium can push the second liquid medium to produce compression energy storage through floating piston, and then filters the impact load from electric cylinder in real time, plays the filtering stabilizing effect to high frequency impact, when the load recovers normal, the compression energy storage release of second liquid medium can push the floating piston reset, makes electric cylinder can reset automatically, for high speed impact, realizes the way of first liquid medium instantaneous large flow liquid release through first safety valve to release impact pressure, and then solves high speed impact overload problem, protects the overload safety of electric cylinder.

[0021] From the above, the utility model can successfully solve the problem of electric cylinder for high speed high frequency impact overload protection, compared with conventional mechanical protection has better protection effect, can greatly expand the application range of electric cylinder, especially the application of coal mine underground equipment and open pit mining equipment, realizes effective overload protection while making full use of the characteristics of electric cylinder control system simple, high precision easy control, thereby replacing traditional hydraulic cylinder, satisfies the demand of coal mining electrification reconstruction. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is the structure schematic diagram of the utility model, wherein the integral overload protection device is in the section view state.

[0023] Figure 2 It is Figure 1 The top view of

[0024] In the drawing: 1. floating cylinder body;2. buffer cylinder body;3. floating piston;4. guide sleeve;5. through hole;6. first liquid medium;7. second liquid medium;8. first safety valve;9. second safety valve;10. driving motor;11. speed reducer;12. torque limiter friction device;13. gear box;14. first-stage ball screw telescopic cylinder;15. second-stage ball screw telescopic rod. DETAILED DESCRIPTION

[0025] The technical scheme of the utility model will be described in further detail below through specific implementation.

[0026] For example Figure 1 And Figure 2The utility model discloses an impact resistance electro-hydraulic integrated heavy load electric cylinder, including electric cylinder body, the bottom of electric cylinder body is provided with integrated overload protection device, and the integrated overload protection device includes floating cylinder body 1, buffer cylinder body 2 and floating piston 3, floating cylinder body 1 is coaxially sealed slidingly inserted in buffer cylinder body 2, and the cylinder mouth of buffer cylinder body 2 is fixedly installed with the guide sleeve 4 of the outer circumference of floating cylinder body 1, the top of floating cylinder body 1 is fixedly connected in the bottom of electric cylinder body, floating piston 3 is sealingly slidably installed in floating cylinder body 1, and the bottom of floating cylinder body 1 and the inner bottom of buffer cylinder body 2 form first cavity, and the inner bottom of floating cylinder body 1 and floating piston 3 form second cavity, and floating piston 3 and the bottom of electric cylinder body form third cavity, and the bottom of floating cylinder body 1 is equipped with the through hole 5 of the communication of first cavity and second cavity, and first liquid medium 6 is filled in first cavity and second cavity, and second liquid medium 7 is filled in third cavity, and the bottom of buffer cylinder body 2 is installed with the first safety valve 8 of the communication of first cavity, and the top of floating cylinder body 1 is installed with the second safety valve 9 of the communication of third cavity, and the compression coefficient of first liquid medium 6 is less than the compression coefficient of second liquid medium 7, and the valve value of first safety valve 8 is less than the valve value of second safety valve 9.

[0027] The through hole 5 is arranged at the center of the bottom of floating cylinder body 1.

[0028] The side wall of buffer cylinder body 2 is provided with the first one-way liquid supplementing port of the communication of first cavity.

[0029] The side wall of floating cylinder body 1 is provided with the second one-way liquid supplementing port of the communication of third cavity.

[0030] The working principle of the embodiment is as follows: when the impact load acts on the electric cylinder body, the overload impact force is transmitted to the floating cylinder body 1 through the cylinder barrel of the electric cylinder body, the cylinder bottom of the floating cylinder body 1 acts on the first liquid medium 6 in the first cavity, and then converts the overload impact force into the liquid pressure of the first liquid medium 6. Since the first cavity and the second cavity are communicated through the through hole 5, the pressure of the first liquid medium 6 in the first cavity and the second cavity is the same, and then the first liquid medium 6 in the second cavity pushes the floating piston 3 to move (a certain floating amount is generated), so that the floating piston 3 pushes the second liquid medium 7 in the third cavity to generate compression energy storage (volume deformation to absorb energy and store). When the impact load intensity is low, usually high-frequency impact, the pressure of the first liquid medium 6 generated by the impact load is less than the valve value of the first safety valve 8, and then the second liquid medium 7 in the third cavity absorbs the overload energy by compression energy storage, and then filters the impact load from the electric cylinder in real time, and plays a filtering and stabilizing role on high-frequency impact. When the load returns to normal, the compression energy storage of the second liquid medium 7 pushes the floating piston 3 to reset, and the floating piston 3 pushes the first liquid medium 6 in the second cavity back to the first cavity, so that the electric cylinder returns to normal, and the effective protection of the high-frequency impact of the electric cylinder is realized, and the automatic reset can be realized. When the impact load intensity is high, usually high-speed impact, the pressure of the first liquid medium 6 generated by the impact load is greater than the valve value of the first safety valve 8, and then the first liquid medium 6 releases the impact pressure by realizing large-flow liquid leakage through the first safety valve 8, and then solves the problem of high-speed impact overload, and protects the overload safety of the electric cylinder.

[0031] Since the impact load is short time, the liquid leakage amount of the first liquid medium 6 is small relative to the total liquid amount. If the pressure of the first liquid medium 6 generated by the impact load of high-speed impact is greater than the valve value of the second safety valve 9, then the second liquid medium 7 also leaks through the second safety valve 9.

[0032] In order to ensure the working reliability of the anti-impact electric hydraulic integrated heavy load electric cylinder, the first liquid medium 6 can be supplemented into the first cavity through the first one-way liquid supplementing port, and the second liquid medium 7 can be supplemented into the third cavity through the second one-way liquid supplementing port.

[0033] Embodiment 2

[0034] The difference between the embodiment 1 and the embodiment 2 is that the electric cylinder body of the embodiment 2 mainly comprises a driving motor 10, a speed reducer 11, a torque limiter 12, a gear box 13, a first-stage ball screw telescopic barrel 14 and a second-stage ball screw telescopic rod 15, and the floating cylinder body 1 is coaxially fixedly arranged at the barrel bottom of the first-stage ball screw telescopic barrel 14.

[0035] It should be noted that the above examples are used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the specific embodiments of the present application can be modified or some technical features can be replaced by equivalent ones; without departing from the spirit of the technical solutions of the present application, they should be covered in the technical solution range of the present application claimed.

Claims

1. An impact-resistant electro-hydraulic integrated heavy-duty electric cylinder, comprising a cylinder body, characterized in that: An integrated overload protection device is installed at the bottom of the electric cylinder body. This integrated overload protection device includes a floating cylinder, a buffer cylinder, and a floating piston. The floating cylinder is coaxially and slidably inserted into the buffer cylinder. A guide sleeve fitted on the outer circumference of the floating cylinder is fixedly installed in the cylinder port of the buffer cylinder. The top of the floating cylinder is fixedly connected to the bottom of the electric cylinder body. The floating piston is slidably installed in the floating cylinder body. A first cavity is formed between the bottom of the floating cylinder and the inner bottom of the buffer cylinder. A second cavity is formed between the inner bottom of the floating cylinder and the floating piston. A third cavity is formed between the floating piston and the bottom of the electric cylinder body. The bottom of the floating cylinder has a through hole connecting the first and second cavities. The first and second cavities are filled with a first liquid medium, and the third cavity is filled with a second liquid medium. A first safety valve connected to the first cavity is installed on the side wall of the bottom of the buffer cylinder. A second safety valve connected to the third cavity is installed on the side wall of the top of the floating cylinder. The compressibility coefficient of the first liquid medium is less than that of the second liquid medium, and the threshold of the first safety valve is less than that of the second safety valve.

2. The impact-resistant electro-hydraulic integrated heavy-duty electric cylinder according to claim 1, characterized in that: The through hole is located at the center of the bottom of the floating cylinder.

3. The impact-resistant electro-hydraulic integrated heavy-duty electric cylinder according to claim 1, characterized in that: The side wall of the buffer cylinder is provided with a first one-way liquid replenishment port that communicates with the first cavity.

4. The impact-resistant electro-hydraulic integrated heavy-duty electric cylinder according to claim 1, characterized in that: The side wall of the floating cylinder is provided with a second one-way liquid replenishment port that communicates with the third chamber.

5. The impact-resistant electro-hydraulic integrated heavy-duty electric cylinder according to any one of claims 1-4, characterized in that: The electric cylinder body is mainly composed of a drive motor, a reducer, a torque limiting friction device, a gearbox, a first-stage ball screw telescopic cylinder, and a second-stage ball screw telescopic rod. The floating cylinder body is coaxially fixed at the bottom of the first-stage ball screw telescopic cylinder.

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