Finger-shaped gate pressure relief protection device

Abstract

The utility model relates to a finger-shaped gate pressure relief protection device, which belongs to the technical field of safety protection of finger-shaped gates and comprises an electric-hydraulic push rod, an overflow valve, a high-pressure hose A, a high-pressure hose B and a high-pressure hose C. The high-pressure hose A is connected between an oil filling hole of an oil tank and an overflow port of the overflow valve. The high-pressure hose B is connected between an oil outlet hole B of the oil pump and an oil inlet of the overflow valve; the high-pressure hose C is connected between the oil hole of the lower piston cavity and the oil outlet of the overflow valve; according to the utility model, the pressure relief of the hydraulic push rod can be realized, and the damage of the electric-hydraulic push rod or a finger-shaped gate connecting piece caused by overhigh pressure of the electric-hydraulic push rod can be effectively avoided under the conditions of remote operation errors and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of safety protection of finger gates, and specifically relates to a pressure relief protection device for finger gates. Background Technique

[0002] The ore discharging method of the four-plate heavy-duty sector electro-hydraulic gate vibrating ore feeder (model: FZC4.5 / 1.4×4-11×4) is remote control. The lifting of the finger gate is controlled by controlling the hydraulic pressure at both ends of the piston of the electro-hydraulic push rod (model: XDGP7000-900 / 55), and the ore discharging is carried out in cooperation with the vibrating motor.

[0003] During the use process, the operator completely relies on the monitoring screen transmitted in real time by the camera to operate the lifting of the finger gate. Since the monitoring screen cannot accurately reflect the actual rising and falling positions of the finger gate, the electro-hydraulic push rod works under overpressure. Under the action of a strong thrust, it is easy to cause the fixed pins at the upper and lower ends of the finger gate to break and fall off, the fixed lifting lugs at the base of the electro-hydraulic push rod, the hydraulic rod and the suspension beam to bend, deform, break and fall off, and the foundation of the brow beam of the ore pass to crack, causing great damage to the ore discharging equipment and facilities and high maintenance costs.

[0004] Especially when there are large ore blocks hidden in the fine ore pile under the finger gate, when the finger gate is closed and the large block gets stuck under the finger gate, the finger gate stops descending. The remote operator mistakenly thinks that the finger gate is not fully closed and continuously gives the gate descending command, which will cause the pressure of the electro-hydraulic push rod to be too high and damage the connecting parts of the finger gate. Summary of the Invention

[0005] In order to overcome the problems in the background technique, the utility model provides a pressure relief protection device for finger gates. By connecting a relief valve to the oil circuit of the hydraulic push rod, the pressure relief of the hydraulic push rod can be realized, and in case of remote operation errors, etc., the damage to the electro-hydraulic push rod or the connecting parts of the finger gate caused by too high pressure of the electro-hydraulic push rod can be effectively avoided.

[0006] To achieve the above purpose, the utility model is realized by the following technical solutions:

[0007] The pressure relief protection device for finger gates includes an electro-hydraulic push rod and a pressure relief circuit; the pressure relief circuit is connected between the oil outlet hole B of the oil pump and the oil hole of the lower piston chamber. The pressure relief circuit includes a relief valve, a high-pressure hose A, a high-pressure hose B and a high-pressure hose C. Among them, the high-pressure hose A is connected between the oil filling hole of the fuel tank and the overflow port of the relief valve; the high-pressure hose B is connected between the oil outlet hole B of the oil pump and the oil inlet port of the relief valve; the high-pressure hose C is connected between the oil hole of the lower piston chamber and the oil outlet port of the relief valve.

[0008] Furthermore, a high-pressure hose is connected between the oil outlet hole A of the oil pump and the oil hole of the upper piston chamber.

[0009] Furthermore, the high-pressure hoses A, B, and C are all connected to the overflow valve and the electro-hydraulic push rod through hydraulic adapters.

[0010] Furthermore, the working pressure of the overflow valve is 0.2 - 0.4 MPa.

[0011] Furthermore, the nominal pressure of the high-pressure hoses A, B, and C is not less than 28 Mpa.

[0012] The pressure relief circuit of the present utility model can also be connected between the oil outlet hole A of the oil pump and the oil hole of the upper piston cavity; among them, the high-pressure hose A is connected between the oil filling hole of the fuel tank and the overflow port of the overflow valve; the high-pressure hose B is connected between the oil outlet hole A of the oil pump and the oil inlet port of the overflow valve; the high-pressure hose C is connected between the oil hole of the upper piston cavity and the oil outlet port of the overflow valve.

[0013] Advantages of the present utility model:

[0014] By connecting an overflow valve between the oil hole of the lower piston cavity of the electro-hydraulic push rod and the oil filling port of the fuel tank, and connecting the overflow port of the overflow valve to the oil filling hole of the fuel tank, the present utility model can effectively relieve the pressure of the electro-hydraulic push rod, and can effectively avoid damage to the electro-hydraulic push rod or the finger gate connecting piece caused by overpressure operation of the electro-hydraulic push rod in case of remote operation errors. Description of the Drawings

[0015] Figure 1 is the oil circuit connection relationship diagram between the oil outlet hole of the electro-hydraulic push rod oil pump and the push rod before transformation;

[0016] Figure 2 is the structural schematic diagram of Embodiment 1 of the present utility model;

[0017] Figure 3 is the side view of the electro-hydraulic push rod;

[0018] In the figure, 1 - electro-hydraulic push rod, 2 - overflow valve, 3 - high-pressure hose A, 4 - high-pressure hose B, 5 - high-pressure hose C, 6 - oil outlet hole A of the oil pump, 7 - oil outlet hole B of the oil pump, 8 - oil hole of the lower piston cavity, 9 - oil hole of the upper piston cavity, 10 - oil filling hole, 11 - high-pressure oil pipe, 12 - fuel tank, 13 - motor, 14 - push rod, 15 - piston, 16 - oil pump. Detailed Embodiments

[0019] In order to make the purpose, technical solutions, and advantages of the present utility model clearer, the preferred embodiments of the present utility model will be described in detail below with reference to the drawings to facilitate understanding by those skilled in the art.

[0020] In the description of the present utility model, unless otherwise specified, the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0021] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and defined, the terms "installation", "connection", and "provided with" 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 directly connected or indirectly connected through an intermediate medium. 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.

[0022] The existing electro-hydraulic push rod is as Figure 1 shown. There are two oil pump oil outlet holes (oil pump oil outlet hole A6 and oil hole oil outlet hole B7) respectively provided on the electro-hydraulic push rod. Two high-pressure hoses 11 are respectively connected between the oil pump oil outlet hole A6 and the lower piston chamber oil hole 8, and between the oil pump oil outlet hole B7 and the upper piston chamber oil hole 9. When the finger gate cannot continue to descend but the gate command is continuously given, it will cause the electro-hydraulic push rod to work under overpressure, easily causing faults such as the breakage and detachment of the fixed pins at the upper and lower ends of the finger gate, the bending deformation, breakage and detachment of the fixed lifting lugs, hydraulic rods and suspension beams at the base of the electro-hydraulic push rod, and the cracking of the foundation of the chute brow beam.

[0023] To solve the above problems, through a large number of experimental studies, the inventor proposed to use an overflow valve to relieve pressure to solve the problem of overpressure operation of the electro-hydraulic push rod. After verification, the Y-25 type overflow valve has good adaptability to the electro-hydraulic push rod, and the pressure relief effect is obvious, which can effectively solve the problem of overpressure operation of the electro-hydraulic push rod. Embodiment 1

[0024] As shown in the attached Figure 2 , the present utility model can effectively relieve pressure and avoid overpressure operation of the electro-hydraulic push rod by replacing one of the high-pressure oil hoses 11 with a pressure relief circuit.

[0025] The pressure relief circuit includes a high-pressure hose A3, a high-pressure hose B4, a high-pressure hose C5 and an overflow valve 2. Among them, the high-pressure hose A3 is connected between the oil filling hole 10 of the fuel tank and the overflow port of the overflow valve 2; the high-pressure hose B4 is connected between the oil pump oil outlet hole B7 and the oil inlet port of the overflow valve 2; the high-pressure hose C5 is connected between the lower piston chamber oil hole 8 and the oil outlet port of the overflow valve 2. When the pressure of the hydraulic cylinder is too high, the overflow valve 2 can effectively relieve pressure on the hydraulic cylinder, effectively solving the problem of overpressure operation of the electro-hydraulic push rod.

[0026] The interfaces of the high-pressure hoses A3, B4, and C5 with the overflow valve 2 are all connected through hydraulic adapters. The model of the high-pressure hoses is C-C d16×670 PN28Mpa, and the models of the hydraulic adapters are: M16×1.5-16×1.5D and M17.6×1.5-16.4×1.5D. The adjustment pressure of the overflow valve 2 is set to 0.2 - 0.4 MPa.

[0027] The maximum pressure inside the hydraulic cylinder is 28 MPa. After the utility model is put into use, the unloading pressure can be adjusted according to the on-site usage conditions. When the pressure in the oil cylinder is too high, the overflow valve 2 will relieve the pressure, and the finger gate will stop descending, indirectly prompting the operator that the pressure in the oil cylinder is too high and the pressure has been relieved, so as to perform the next operation, reduce the failure rate of the finger gate valve, and further reduce the risk of injury caused by the maintenance personnel working at heights and in narrow spaces. It can reduce the workload of on-site maintenance personnel and the expenditure on materials, extend the service life of the finger gate and its auxiliary equipment, reduce the equipment failure rate, and ensure the continuity of ore transportation production.

[0028] The transformation process of this embodiment:

[0029] (1) Remove the high-pressure oil pipe 11 connecting the oil outlet hole B7 of the electro-hydraulic push rod oil pump and the oil hole 8 of the upper piston chamber.

[0030] (2) Install the high-pressure hoses B4 and C5 (model: C-C d16×670 PN28Mpa) on the oil outlet hole B7 of the electro-hydraulic push rod oil pump and the oil hole 8 of the upper piston chamber respectively.

[0031] (3) Connect the other ends of the high-pressure hoses B4 and C5 to the inlet and outlet ports of the overflow valve (model: Y-25) through two hydraulic adapters (model: M16×1.5-16×1.5D) respectively.

[0032] (4) Connect the high-pressure hose A3 between the overflow port of the overflow valve 2 (adapter model: M17.6×1.5-16.4×1.5D) and the oil filling hole 10 of the fuel tank 12. The model of the high-pressure hose A3 is C-C d16×670 PN28Mpa).

[0033] (5) Adjust the value of the overflow valve 2 to about 0.2 - 0.4 MPa.

[0034] The utility model only needs to install three high-pressure oil pipes, one overflow valve, four hydraulic adapters, and 6 combined washers, and the installation is fast. It only takes 10 - 20 minutes to complete the transformation of an electro-hydraulic push rod. Embodiment 2

[0035] In this embodiment, the pressure relief circuit is connected between the oil outlet hole A6 of the oil pump and the oil hole 9 of the upper piston chamber; among them, the high-pressure hose A3 is connected between the oil filling hole 10 of the fuel tank and the overflow port of the overflow valve 2; the high-pressure hose B4 is connected between the oil outlet hole A6 of the oil pump and the oil inlet port of the overflow valve 2; the high-pressure hose C5 is connected between the oil hole 9 of the upper piston chamber and the oil outlet port of the overflow valve 2. The working principle of this embodiment is the same as that of Embodiment 1.

[0036] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A finger gate pressure relief protection device, characterized in that: It comprises an electro-hydraulic push rod (1) and a pressure relief circuit, wherein the pressure relief circuit is connected between an oil pump oil outlet hole B (7) and a lower piston chamber oil hole (8); The pressure relief circuit comprises a relief valve (2), a high-pressure hose A (3), a high-pressure hose B (4) and a high-pressure hose C (5), wherein the high-pressure hose A (3) is connected between the oil filling hole (10) of the oil tank (12) and the overflow port of the relief valve (2); the high-pressure hose B (4) is connected between the oil outlet hole B (7) of the oil pump and the oil inlet of the relief valve (2); and the high-pressure hose C (5) is connected between the oil hole (8) of the lower piston chamber and the oil outlet of the relief valve (2).

2. The finger gate pressure relief protection device according to claim 1, characterized in that: A high-pressure oil pipe (11) is connected between the oil pump oil outlet hole A (6) and the upper piston chamber oil hole (9).

3. The finger gate pressure relief protection device according to claim 1, characterized in that: The high-pressure hose A (3), the high-pressure hose B (4) and the high-pressure hose C (5) are all connected to the relief valve (2) via a hydraulic transition joint.

4. The finger gate pressure relief protection device according to claim 1, characterized in that: The working pressure of the relief valve (2) is 0.2-0.4 MPa.

5. The finger gate pressure relief protection device according to claim 1, characterized in that: The nominal pressure of high-pressure hose A (3), high-pressure hose B (4) and high-pressure hose C (5) shall not be less than 28 MPa.

6. The finger gate pressure relief protection device according to any one of claims 1 to 5, characterized in that: The pressure relief circuit is connected between the oil pump oil outlet hole A (6) and the upper piston chamber oil hole (9); wherein the high-pressure hose A (3) is connected between the oil filling hole (10) of the oil tank (12) and the overflow port of the overflow valve (2); the high-pressure hose B (4) is connected between the oil pump oil outlet hole A (6) and the oil inlet of the overflow valve (2); and the high-pressure hose C (5) is connected between the upper piston chamber oil hole (9) and the oil outlet of the overflow valve (2).

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