A taphole opening machine motor speed control loop

Abstract

This utility model provides a speed control circuit for a taphole machine motor, relating to the technical field of control circuits, used to drive the drill rod of the taphole machine to rotate. It includes: a motor, an acceleration unit, a braking unit, and a proportional control unit. The acceleration unit includes: an electromagnetic directional valve and a pressure reducing valve; the system pressure is connected through the pressure reducing valve; the other end of the pressure reducing valve is connected to one end of the electromagnetic directional valve; the other end of the electromagnetic directional valve is connected to the motor, pushing the rotor to radially deflect. The braking unit includes: an overflow valve, check valve I, check valve II, check valve III, and check valve IV; the overflow valve, check valve I, check valve II, check valve III, and check valve IV constitute a hydraulic bridge circuit; the hydraulic bridge circuit provides bidirectional braking to the motor; the proportional control unit includes: a proportional directional valve, a pressure reducing valve, and a back pressure valve.

Description

Technical Field

[0001] This utility model relates to the technical field of control circuits, and more particularly to a speed control circuit for a taphole machine motor. Background Technology

[0002] The taphole opener is one of the key pieces of equipment in a blast furnace. Its function is to use a motor to quickly open the taphole at a certain speed, allowing molten iron to flow smoothly out of the furnace. Therefore, the stability and opening capacity of the taphole opener directly affect the output, production order, and subsequent steelmaking and rolling processes of the blast furnace.

[0003] Due to the significantly increased smelting intensity of modern blast furnaces, the depth of the taphole has increased, the thickness of the furnace walls has increased, and the strength of the taphole clay has increased, making it very difficult to open the taphole. The taphole opener's vibratory rod, arc-shaped nut, and drill rod threads are prone to breakage and damage; the consumption of drill bits and drill rods has increased. Sometimes, opening a single taphole requires multiple replacements of drill bits and drill rods. The gears and bearings in the rotating structure of the motor wear severely, and when encountering high resistance at the taphole, phenomena such as slippage of the rotating gears and jamming of the drill rod frequently occur, increasing the labor intensity of workers and sometimes making it impossible to open the taphole.

[0004] Furthermore, defects in the hydraulic control of the taphole machine motor lead to prolonged taphole opening time, resulting in irregular taphole channels, rapid taphole erosion, low taphole qualification rate, unstable mud-pouring volume in the mud gun, and high taphole maintenance requirements. This also causes furnace blockage, abnormal furnace conditions, reduced blast, reduced production, and even furnace shutdown, severely restricting normal blast furnace production. Utility Model Content

[0005] In view of the technical problems mentioned in the background section above, a speed control circuit for a tapping machine motor is provided.

[0006] The technical means adopted in this utility model are as follows: A speed control circuit for a taphole machine motor, used to drive the taphole machine drill rod to rotate, characterized in that it includes: a motor, an acceleration unit, a braking unit, and a proportional control unit; The acceleration unit includes: an electromagnetic reversing valve and a pressure reducing valve; the pump's outlet pressure is connected through the pressure reducing valve; the other end of the pressure reducing valve is connected to one end of the electromagnetic reversing valve; the other end of the electromagnetic reversing valve is connected to the motor, and the hydraulic medium pushes the rotor to deflect radially. The braking unit includes: a relief valve, a one-way valve I, a one-way valve II, a one-way valve III, and a one-way valve IV; the relief valve, one-way valve I, one-way valve II, one-way valve III, and one-way valve IV constitute a hydraulic bridge circuit; the hydraulic bridge circuit provides bidirectional braking for the motor; The proportional control unit includes a proportional directional valve, a pressure reducing valve, and a back pressure valve.

[0007] Furthermore, the proportional directional valve changes the rotation direction of the motor while controlling the flow rate input to the motor.

[0008] Furthermore, the pressure reducing valve adjusts the motor pressure according to changes in the external load.

[0009] Furthermore, the motor includes: an oil inlet at port A, an oil outlet at port B, an oil inlet at port B, and an oil outlet at port A.

[0010] Furthermore, the one-way valves I, II, III, and IV at the overflow bridge inlet and outlet serve as self-priming oil replenishment for the motor.

[0011] Furthermore, the motor has a rotor eccentric variable structure.

[0012] Compared with the prior art, the present invention has the following advantages: 1. By inputting analog signals (current, voltage) to the proportional directional valve amplifier through a computer, the rotation direction of the motor can be changed and the amount of flow into the motor can be controlled, thereby improving the working efficiency of the tapping machine.

[0013] 2. The motor adopts a rotor eccentric variable structure. The rotor can be driven by external hydraulic pressure to produce radial offset, thereby reducing the displacement and increasing the speed.

[0014] 3. Without increasing the capacity and power of the hydraulic pump, the hydraulic system can enable the motor to achieve a very high speed, driving the hydraulic taphole opener to quickly open the taphole.

[0015] 4. When the motor is working, the back pressure valve can absorb and alleviate sudden changes in positive and reverse pressure from external loads, prevent speed loss, ensure smooth motor rotation, and avoid system pressure shocks.

[0016] 5. An overflow bridge is used to achieve motor braking. The low-pressure side check valve can replenish oil from the oil tank to the oil circuit, avoiding the phenomenon of the oil suction chamber sucking in the motor during the reversing braking process. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This invention relates to a motor speed control circuit.

[0019] Figure 2 This is the braking unit of this utility model.

[0020] In the diagram: 1 is the motor, 2 is the acceleration unit, 3 is the braking unit, 4 is the proportional control unit, 21 is the solenoid directional valve, 22 is the pressure reducing valve, 31 is the relief valve, 32 is the check valve I, 33 is the check valve II, 34 is the check valve III, 35 is the check valve IV, 36 is the oil tank, 41 is the proportional directional valve, 42 is the pressure reducing valve, and 43 is the back pressure valve. Detailed Implementation

[0021] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this utility model or its application or use. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0023] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0024] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0025] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0026] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0027] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0028] like Figure 1 As shown in Figure 2, a speed control circuit for a taphole machine motor is used to drive the drill rod of the taphole machine to rotate. It includes a motor 1, an acceleration unit 2, a braking unit 3, and a proportional control unit 4. The motor 1 adopts a rotor eccentric variable displacement structure, allowing the rotor to be pushed by external hydraulic pressure, generating radial offset, thereby reducing displacement and increasing speed. The acceleration unit 2 includes an electromagnetic reversing valve 21 and a pressure reducing valve 22. After the system pressure is reduced by the pressure reducing valve 22, it enters the motor 1 through the electromagnetic reversing valve 21, pushing the rotor to offset radially. The output speed of the hydraulic motor 1 is: n = Q / q; where Q is the motor input flow rate and q is the motor displacement; when Q is constant, a decrease in q leads to an increase in n.

[0029] The braking unit 3 consists of a relief valve 31 and the one-way valves I32, II33, III34 and IV35, forming a hydraulic bridge circuit that enables bidirectional braking of the motor 1 and provides a buffering effect.

[0030] Assuming motor 1 has oil inlet at port A and oil outlet at port B, and uses an overflow bridge to brake motor 1, when the proportional directional valve 41 returns to the neutral position, motor 1 tends to continue rotating due to inertia. The high-pressure oil discharged at this time is limited by the overflow valve 31 via check valve 32, and on the other side, oil is drawn from the oil tank 36 via check valve 34. The overflow valve 31 in this circuit not only limits the hydraulic shock caused by the proportional directional valve 41 returning to the neutral position, but also allows motor 1 to brake smoothly.

[0031] Assuming motor 1 has oil inlet at port B and oil outlet at port A, and uses an overflow bridge to brake motor 1, when the proportional directional valve 41 returns to the neutral position, motor 1 tends to continue rotating due to inertia. The high-pressure oil discharged at this time is limited by the overflow valve 31 via check valve 35, and on the other side, oil is drawn from the oil tank 36 via check valve 33. The overflow valve 31 in this circuit not only limits the hydraulic shock caused by the proportional directional valve 41 returning to the neutral position, but also allows motor 1 to brake smoothly.

[0032] The four check valves at the overflow bridge inlet and outlet, namely check valve I32, check valve II33, check valve III34 and check valve IV35, not only constitute the brake oil circuit, but also play a role in self-priming and replenishing oil for motor 1.

[0033] The proportional control unit 4 includes a proportional directional valve 41, a pressure reducing valve 42, and a back pressure valve 43. The proportional directional valve 41 can change the rotation direction of the motor 1 and control the flow rate input to the motor 1. The pressure reducing valve 42 can adjust the pressure at any time according to the changes in the external load. When the motor 1 is working, the back pressure valve 43 can alleviate the sudden changes in the positive and reverse pressure of the external load and prevent speed loss.

[0034] This hydraulic control circuit enables motor 1 to achieve a very high speed without increasing the capacity and power of the hydraulic pump, thereby driving the hydraulic tapping machine to quickly open the tap.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A taphole opener motor speed control loop for driving rotation of a taphole opener drill rod, comprising: include: Motor, acceleration unit, braking unit, and proportional control unit; The acceleration unit includes: an electromagnetic reversing valve and a pressure reducing valve; the pump's outlet pressure is connected through the pressure reducing valve; the other end of the pressure reducing valve is connected to one end of the electromagnetic reversing valve; the other end of the electromagnetic reversing valve is connected to the motor, and the hydraulic medium pushes the rotor to deflect radially. The braking unit includes: a relief valve, a one-way valve I, a one-way valve II, a one-way valve III, and a one-way valve IV; the relief valve, one-way valve I, one-way valve II, one-way valve III, and one-way valve IV constitute a hydraulic bridge circuit; the hydraulic bridge circuit provides bidirectional braking for the motor; The proportional control unit includes a proportional directional valve, a pressure reducing valve, and a back pressure valve.

2. A motor speed control loop for a taphole opener according to claim 1, wherein The proportional directional valve changes the rotation direction of the motor and controls the flow rate input to the motor.

3. The speed control circuit for a taphole machine motor according to claim 1, characterized in that, The pressure reducing valve adjusts the motor pressure according to changes in the external load.

4. The speed control circuit for a taphole machine motor according to claim 1, characterized in that, The motor includes: an oil inlet at port A, an oil outlet at port B, an oil inlet at port B, and an oil outlet at port A.

5. The speed control circuit for a taphole machine motor according to claim 1, characterized in that, The one-way valves I, II, III and IV at the overflow bridge inlet and outlet serve to provide self-priming oil replenishment for the motor.

6. The speed control circuit for a taphole machine motor according to claim 1, characterized in that, The motor has a rotor eccentric variable structure.

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