Plunger rod device for vacuum induction furnace launder system

Abstract

The utility model discloses a plunger rod device for a launder system of a vacuum induction furnace, which comprises a hydraulic driving component, a plunger actuator and a launder, the hydraulic driving component comprises a hydraulic cylinder, a coupler and a push rod, and the hydraulic cylinder is fixed on a mounting flange on the top surface of a tundish of the launder through a sealing seat; the interior of a tundish of the launder is in a vacuum state, and the hydraulic cylinder is located outside the tundish of the launder and is in vacuum isolation with the tundish of the launder through the sealing seat. An extension rod of the hydraulic cylinder faces downwards, and the tail end of the extension rod of the hydraulic cylinder is connected with a push rod through a coupler; the plunger actuator comprises a stop flange, a main body support, a rocker arm, a transmission plate, a plunger rod and two lever arm shafts. The plunger rod device for the vacuum induction furnace launder system effectively solves the problems that a traditional nozzle for the vacuum induction furnace launder system is not thorough in sealing, high in maintenance strength and short in service life.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of plunger rod devices for vacuum induction furnace flow channel system. BACKGROUND

[0002] Vacuum induction furnace is a complete set of equipment for vacuum smelting under vacuum environment by using medium-frequency induction heating principle to melt metal. It is also one of the important vacuum smelting equipment in the field of metallurgy for producing nickel-based high-temperature alloy, nuclear alloy, stainless steel, super high strength steel and other special alloy materials.

[0003] At present, with the vigorous development of steel industry, vacuum induction furnace is also changing rapidly, especially in the field of special steel smelting, the mechanical properties of steel materials are quite demanding, and these materials are often used in aerospace, satellite and other high-tech industries. Therefore, we are researching the performance and structure of vacuum melting furnace from the aspects of human-machine engineering, energy consumption engineering, automation degree, green environmental protection and other aspects. Here, the hot flow channel insertion device has attracted widespread attention in the domestic and foreign steel special metallurgy field for reducing slag and inclusions in the production of high-quality electrodes. There are various disadvantages in the vacuum system of the current vacuum induction melting furnace: gas pollution is easy to occur during pouring, the product quality is low, the production cost is high, and there is a risk of metal entering the mold chamber. This is closely related to the use of long flow channel and built-in plunger system or without plunger system in the vacuum system of the current vacuum induction furnace. SUMMARY

[0004] The utility model aims at overcoming the defects of prior art, and provides a kind of plunger rod devices for vacuum induction furnace flow channel system, and its switch blocking effect to flow channel is good, service life is long, degree of automation is high, can effectively improve the quality of vacuum melting product, improve the stability of vacuum melting product material quality, reduce the labor intensity of worker, improve continuous production efficiency, realize energy saving and emission reduction, green and high efficiency;It effectively solves the problems of low service life, high maintenance intensity and low material quality of the plunger mechanism used in the traditional vacuum system of vacuum induction furnace.

[0005] The technical scheme for realizing the above-mentioned purpose is as follows: a kind of plunger rod devices for vacuum induction furnace flow channel system, including hydraulic drive assembly, plunger actuator and flow channel, wherein:

[0006] The hydraulic drive assembly includes a hydraulic cylinder, a shaft coupling and a push rod, the hydraulic cylinder is fixed on the mounting flange of the tundish top surface of the flow channel through a sealing seat;The inside of the tundish of the flow channel is in a vacuum state, and the hydraulic cylinder is located outside the tundish of the flow channel and realizes vacuum isolation with the tundish of the flow channel through the sealing seat;The extension rod of the hydraulic cylinder is downward, and the push rod is connected to the end of the extension rod of the hydraulic cylinder through the shaft coupling;

[0007] The plunger actuator comprises a stop flange, a main support, a rocker arm, a transmission plate, a plunger rod and two lever shafts, the main support is fixed on the side wall of the launder through a mounting bracket, vertical support column guide holes and two groups of lever shaft guide holes are arranged on the main support, the stop flange is composed of a bearing flange and a support column connected to the bottom end of the bearing flange, the support column is movably inserted into the support column guide hole, the stop flange is located directly below the push rod, and the push rod is coaxially arranged with the support column; the two lever shafts are correspondingly inserted into the two groups of lever shaft guide holes, and each lever shaft moves up and down along the corresponding lever shaft guide hole; the middle part of the rocker arm is rotatably arranged at the bottom end of the main support through a pin shaft, the rocker arm rotates reciprocally around the pin shaft; one end of the rocker arm is connected to the bottom end of the support column, and the other end is connected to the bottom end of the two lever shafts respectively; one end of the transmission plate is connected to the top end of the two lever shafts respectively, and the other end is connected to the top end of the plunger rod, and the plunger rod is aligned with the pouring nozzle of the launder.

[0008] The plunger rod device for the launder system of the vacuum induction furnace, wherein the two lever shafts are arranged in parallel, and counterweights are connected to the bottom ends of the two lever shafts.

[0009] The plunger rod device for the launder system of the vacuum induction furnace, wherein the bottom end of the plunger rod is provided with a ceramic tip.

[0010] The plunger rod device for the launder system of the vacuum induction furnace, wherein one end of the transmission plate is provided with a U-shaped groove, the top end of the plunger rod is arranged in the U-shaped groove and can be adjusted forward and backward along the U-shaped groove, and the plunger rod and the pouring nozzle of the launder are coaxial.

[0011] The plunger rod device for the launder system of the vacuum induction furnace, wherein a sealing ring is arranged between the contact surface of the hydraulic cylinder and the sealing seat.

[0012] The plunger rod device for the launder system of the vacuum induction furnace, wherein the bearing flange of the stop flange is made of graphite bronze material.

[0013] The plunger rod device for the vacuum induction furnace runner system, wherein, during pouring, the hydraulic cylinder drives the push rod to move downward through the coupling, hits the bearing flange of the stop flange, the support column of the stop flange moves downward, the two lever arms are driven to move upward by the rocker arm during the downward movement of the support column, and the plunger rod is driven to move upward by the transmission plate, away from the pouring nozzle of the runner; during stopping pouring, the hydraulic cylinder drives the push rod to retract through the coupling, stops the pressure applied to the stop flange, the plunger actuator returns to the initial state, and the plunger rod moves downward under the action of gravity to block the pouring nozzle of the runner.

[0014] The plunger rod device for the vacuum induction furnace runner system, wherein the hydraulic drive assembly further comprises a first electromagnetic reversing valve, and the first electromagnetic reversing valve is provided with a first hydraulic interface and a second hydraulic interface.

[0015] The hydraulic cylinder comprises an upper cylinder chamber, a piston and a lower cylinder chamber, the upper cylinder chamber is provided with an upper hydraulic interface, and the lower cylinder chamber is provided with a lower hydraulic interface.

[0016] The upper hydraulic interface of the upper cylinder chamber is connected with the first hydraulic interface of the first electromagnetic reversing valve through an upper reciprocating gas path, and the lower hydraulic interface of the lower cylinder chamber is connected with the second hydraulic interface of the first electromagnetic reversing valve through a lower reciprocating gas path.

[0017] The first electromagnetic reversing valve communicates with a hydraulic controller, and the hydraulic controller controls the movement direction of the hydraulic cylinder by controlling the first electromagnetic reversing valve.

[0018] The plunger rod device for the vacuum induction furnace runner system further comprises a skin bag type accumulator, an outlet of the skin bag type accumulator is connected with the upper reciprocating gas path and the lower reciprocating gas path of the hydraulic cylinder through a second electromagnetic reversing valve, the outlet of the skin bag type accumulator is subjected to flow control through a throttle valve, the skin bag type accumulator is subjected to on-off control through a manual plate type ball valve, the second electromagnetic reversing valve communicates with the hydraulic controller, and the hydraulic controller controls whether the skin bag type accumulator is used for work by controlling the second electromagnetic reversing valve.

[0019] The plunger rod device for the vacuum induction furnace flow channel system, wherein a third electromagnetic reversing valve is further included, the upper cylinder chamber is provided with an upper proximity switch, and the lower cylinder chamber is provided with a lower proximity switch; the third electromagnetic reversing valve is connected with the upper reciprocating gas path and the lower reciprocating gas path respectively, the third electromagnetic reversing valve is provided with a first control signal end corresponding to the upper reciprocating gas path interface and a second control signal end corresponding to the lower reciprocating gas path interface, the upper proximity switch, the lower proximity switch, the first control signal end and the second control signal end are all communicated with a hydraulic controller through signal terminals, and the hydraulic controller controls the third electromagnetic reversing valve to switch the entire hydraulic drive assembly.

[0020] The plunger rod device for the vacuum induction furnace flow channel system of the utility model, the push rod of drive hydraulic assembly is coaxial fixed with the stop flange in plunger actuator, the hydraulic cylinder is located outside the tundish, adopts the sealing seat to carry out the vacuum sealing, the plunger actuator is fixed on the side of flow channel body through bearing, the plunger actuator changes the movement direction through the bottom rocker arm to transfer movement. Ultimately when the plunger rod drops, it will block the pouring nozzle of the flow channel to achieve the effect of closing. The plunger actuator ensures vertical up-down movement through the guide hole, its principle is that the plunger rod is switched on and off at the flow channel spout through the hydraulic cylinder, the metal solution is controlled to enter the ingot chamber, and the predetermined process effect is realized. At the same time, the shorter flow channel structure is used under the condition of keeping the slag blocking function, so that lower pouring superheat is realized, and the phenomenon of frozen steel is prevented. The design can effectively improve the quality of vacuum melting products, improve the stability of the material quality of vacuum melting products, reduce the labor intensity of workers, improve the continuous production efficiency, realize energy saving and emission reduction, and be green and efficient. It effectively solves the problems of low service life, high maintenance intensity and low material quality of the traditional plunger mechanism used in the vacuum system of the vacuum induction furnace. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a structure schematic view of the plunger rod device for the vacuum induction furnace flow channel system of the utility model;

[0022] Figure 2 It is an electrical schematic diagram of the hydraulic cylinder. DETAILED DESCRIPTION

[0023] In order for those skilled in the art to better understand the technical scheme of the utility model, the specific embodiments thereof will be described in detail below with reference to the drawings:

[0024] Please refer to Figure 1 and Figure 2 The best embodiment of the utility model, a plunger rod device for a vacuum induction furnace flow channel system, comprising a hydraulic drive assembly A, a plunger actuator B and a flow channel C.

[0025] The hydraulic driving assembly A comprises a hydraulic cylinder 1, a coupling 4 and a push rod 5, the hydraulic cylinder 1 is fixed on the installation flange 3 of the tundish top surface of the flow tank C through a sealing seat 2; a sealing ring is arranged between the contact surface of the hydraulic cylinder 1 and the sealing seat 2.

[0026] The tundish of the flow tank C is in a vacuum state, the hydraulic cylinder 1 is located outside the tundish of the flow tank C and realizes vacuum isolation with the tundish of the flow tank C through the sealing seat 2; the extending rod of the hydraulic cylinder 1 is downward, and the end of the extending rod of the hydraulic cylinder 1 is connected with the push rod 5 through the coupling 4.

[0027] The plunger actuator B comprises a stop flange 6, a main support 7, a rocker arm 8, a transmission plate 12, a plunger rod 13 and two lever shafts 11, the main support 7 is fixed on the side wall of the flow tank C through a mounting bracket 10, and a support column guide hole and two groups of lever shaft guide holes are vertically arranged on the main support 7. The whole plunger actuator C can be adjusted left and right in the horizontal position through the bearing and bolt on the mounting bracket 10, and finally positioned and fixed through the locking screw on the mounting bracket 10.

[0028] The stop flange 6 is composed of a bearing flange 61 and a support column 62 connected with the bottom end of the bearing flange 61, the top end of the bearing flange 61 is made of graphite bronze material, which has the characteristics of high bearing capacity to improve the service life of the mechanism; the support column 62 is movably inserted into the support column guide hole, the stop flange 6 is located directly below the push rod 5, and the push rod 5 is coaxially arranged with the support column 62 to improve the mechanical properties; the push rod 5 is equivalent to the extension of the extending rod of the hydraulic cylinder 1, when the extending rod of the hydraulic cylinder 1 is extended, the movement can be transmitted to the stop flange 6 through the push rod 5, and the support column 62 can only make vertical reciprocating motion along the support column guide hole.

[0029] The two lever shafts 11 are correspondingly inserted into the two groups of lever shaft guide holes, and each lever shaft 11 moves up and down along the corresponding lever shaft guide hole. The two lever shafts 11 are arranged in parallel with each other, and the bottom end of the two lever shafts 11 is connected with a counterweight 9, which has two functions, the first function is to ensure that the two lever shafts 11 can move synchronously, and the second function is to resist the buoyancy of the liquid metal in the flow tank C through the adjustment of the counterweight, so as to ensure the sealing effect of the plunger rod 13 on the pouring nozzle 14.

[0030] The middle part of the rocker arm 8 is rotatably arranged at the bottom end of the main support 7 through a pin shaft, and the rocker arm 8 makes rotary reciprocating motion around the pin shaft; one end of the rocker arm 8 is connected with the bottom end of the support column 62, and the other end is connected with the bottom end of the two lever shafts 11 respectively; through the rocker arm 8, the vertical motion direction of the stop flange 6 can be reversely transmitted to the lever shaft 11, when the stop flange 6 moves downward, the lever shaft 11 moves upward; conversely, when the stop flange 6 moves upward, the lever shaft 11 moves downward.

[0031] One end of the transmission plate 12 is connected with the top end of the two lever shafts 11 respectively, and the other end is connected with the top end of the plunger rod 13, and the plunger rod 13 is aligned with the pouring nozzle 14 of the runner.

[0032] The transmission plate 12 and the lever shaft 11 can synchronously move up and down, the other end of the transmission plate 12 is provided with a U-shaped groove, and the plunger rod 13 is installed in the U-shaped groove; the installation position of the plunger rod 13 can be adjusted forward and backward along the U-shaped groove, and finally, the plunger rod 13 is aligned with the pouring nozzle of the runner and is kept coaxial, and the pouring nozzle 14 is sealed by using the plunger rod 13 to avoid the metal liquid into the mold chamber.

[0033] The bottom end of the plunger rod 13 is provided with a ceramic tip, and the pouring nozzle 14 is sealed.

[0034] The plunger rod device for the runner system of the vacuum induction furnace of the utility model, when pouring, the hydraulic cylinder 1 drives the push rod 5 to move down through the shaft coupling 4, knocks the bearing flange 61 of the stop flange 6, the support column 62 of the stop flange 6 moves downwards, the support column 62 moves downwards and drives the two lever shafts 11 to move upwards simultaneously through the rocker arm 8, and then drives the plunger rod 13 to move upwards through the transmission plate 12, away from the pouring nozzle 14 of the runner C, so that the metal liquid in the runner C can enter the mold chamber for the next process; when stopping pouring, the hydraulic cylinder 1 drives the push rod 5 to retract through the shaft coupling 4, stops the pressure applied on the stop flange 6, the plunger actuator returns to the initial state, the plunger rod 13 moves downwards under the action of gravity and blocks the pouring nozzle 14 of the runner C, preventing the metal liquid from entering the mold chamber.

[0035] The plunger rod device for the runner system of the vacuum induction furnace of the utility model, the whole plunger actuator C can be adjusted left and right in the horizontal position through the bearing and bolt on the mounting frame 10, at the same time, the plunger rod 13 can also be adjusted forward and backward through the U-shaped groove on the transmission plate 12 to increase the sealing performance of the pouring nozzle 14 of the runner C. The length of the runner C is designed to be as short as possible, which achieves two purposes, that is, considering effectively removing large-size slag and considering realizing low pouring superheat (which will reduce the solubility of nitrogen and reduce the inclusion of nitride.) and preventing the phenomenon of frozen steel, in the embodiment,

[0036] The whole system is in contact with the pouring nozzle 14 of the runner C unless affected by the hydraulic cylinder. If the plunger rod 13 is stuck in the open position, the tundish of the runner can still be pushed back into the tundish chamber for maintenance without hitting the push rod 5 of the hydraulic drive assembly.

[0037] The utility model discloses a plunger rod device for vacuum induction furnace flow groove system, and hydraulic drive assembly can also include first electromagnetic reversing valve 1, and first electromagnetic reversing valve 15 is equipped with first hydraulic interface and second hydraulic interface, and hydraulic cylinder 1 includes upper cylinder chamber 31, piston 32 and lower cylinder chamber 33, and upper cylinder chamber 31 is equipped with upper hydraulic interface, and lower cylinder chamber 33 is equipped with lower hydraulic interface, and the upper hydraulic interface of upper cylinder chamber 31 is connected with the first hydraulic interface of first electromagnetic reversing valve 15 through upper reciprocating gas path 16, and the lower hydraulic interface of lower cylinder chamber 33 is connected with the second hydraulic interface of first electromagnetic reversing valve 15 through lower reciprocating gas path 17, and first electromagnetic reversing valve 15 communicates with hydraulic controller, and the movement direction of hydraulic cylinder 1 is controlled through the control of first electromagnetic reversing valve 15 by hydraulic controller.

[0038] The utility model discloses a plunger rod device for vacuum induction furnace flow groove system, as optimization, can also include skin bag type energy accumulator 18, and the outlet of skin bag type energy accumulator 18 is connected with the upper reciprocating gas path 16 and lower reciprocating gas path 27 of hydraulic cylinder 1 respectively through second electromagnetic reversing valve 19, and the outlet of skin bag type energy accumulator 18 carries out flow control through throttle valve 20, and skin bag type energy accumulator 18 carries out on -off control through manual plate type ball valve 22, and second electromagnetic reversing valve 19 communicates with hydraulic controller, and whether using skin bag type energy accumulator 18 to work is controlled through the control of second electromagnetic reversing valve 19 by hydraulic controller.

[0039] The utility model discloses a plunger rod device for vacuum induction furnace flow groove system, as optimization, can also include third electromagnetic reversing valve 21, and upper cylinder chamber 31 is equipped with upper proximity switch, and lower cylinder chamber 33 is equipped with lower proximity switch, and third electromagnetic reversing valve 21 is connected with upper reciprocating gas path 16 and lower reciprocating gas path 17 respectively, and third electromagnetic reversing valve 21 is equipped with the first control signal end corresponding with upper reciprocating gas path interface and the second control signal end corresponding with lower reciprocating gas path interface, and upper proximity switch, lower proximity switch, first control signal end and second control signal end all communicate with hydraulic controller through signal terminal, and the whole hydraulic drive assembly is switched through the control of third electromagnetic reversing valve 21 by hydraulic controller. When upper proximity switch / lower proximity switch detects that the piston is in place, upper proximity switch / lower proximity switch feeds back signal to hydraulic controller, and hydraulic controller controls third electromagnetic reversing valve 21 to close, and hydraulic drive assembly stops retraction / pressing down.

[0040] The utility model discloses a plunger rod device for vacuum induction furnace flow groove system, and the quality of production material is provided, and the service life and stability of mechanism are improved, and it makes the pouring nozzle 14 filtration discharge of flow groove C more controllable, and the metal liquid overheating degree in flow groove C is higher to reach lower production cost and higher material quality.

[0041] The plunger rod device for the vacuum induction furnace flow channel system has high automation degree, low labor intensity of workers, low requirement for human factors, realizes man-machine engineering humanization and simplification, and is intuitive and easy to operate.

[0042] In summary, the plunger rod device for the vacuum induction furnace flow channel system improves the performance and automation degree of the vacuum induction furnace, improves the quality of vacuum melting products, improves the stability of the material quality of the vacuum melting products, reduces the labor intensity of workers, expands the continuous production efficiency, realizes energy saving and emission reduction, and is green and efficient.

[0043] Those skilled in the art of the technical field should recognize that the above embodiments are only used to illustrate the utility model, and are not used as a limitation on the utility model, and as long as the changes and modifications of the above described embodiments are within the essential spirit of the utility model, they will fall within the scope of the claims of the utility model.

Claims

1. A plunger rod device for a flow channel system in a vacuum induction furnace, characterized in that, Includes a hydraulic drive assembly, a piston actuator, and a flow channel, wherein: The hydraulic drive assembly includes a hydraulic cylinder, a coupling, and a push rod. The hydraulic cylinder is fixed to the mounting flange on the top surface of the tundish of the flow channel via a sealing seat. The tundish of the flow channel is in a vacuum state. The hydraulic cylinder is located outside the tundish of the flow channel and is vacuum isolated from the tundish of the flow channel through the sealing seat. The extension rod of the hydraulic cylinder points downward, and the end of the extension rod of the hydraulic cylinder is connected to a push rod via a coupling. The plunger actuator includes a stop flange, a main support, a rocker arm, a transmission plate, a plunger rod, and two lever shafts. The main support is fixed to the side wall of the flow channel by a mounting bracket. The main support has vertically formed guide holes for the support column and two sets of guide holes for the lever shafts. The stop flange consists of a bearing flange and a support column connected to its bottom end. The support column is vertically movable and inserted into the guide holes of the support column. The stop flange is located directly below the push rod, and the push rod is coaxial with the support column. The two lever shafts... The rocker arm is inserted into the guide holes of the two sets of lever shafts, and each lever shaft moves up and down along the corresponding guide hole; the middle part of the rocker arm is rotatably set at the bottom end of the main support through a pin, and the rocker arm rotates and reciprocates around the pin; one end of the rocker arm is connected to the bottom end of the support column, and the other end is connected to the bottom end of the two lever shafts respectively; one end of the transmission plate is connected to the top end of the two lever shafts respectively, and the other end is connected to the top end of the plunger rod, and the plunger rod is aligned with the pouring nozzle of the flow channel.

2. The plunger rod device for a flow channel system in a vacuum induction furnace according to claim 1, characterized in that, The two lever shafts are arranged parallel to each other, and the bottom ends of the two lever shafts are connected to counterweights.

3. A plunger rod device for a flow channel system in a vacuum induction furnace according to claim 1, characterized in that, The bottom end of the plunger rod has a ceramic tip.

4. A plunger rod device for a flow channel system in a vacuum induction furnace according to claim 1, characterized in that, One end of the transmission plate is provided with a U-shaped groove, the top end of the plunger rod is set in the U-shaped groove and can be adjusted back and forth along the U-shaped groove, and the plunger rod and the pouring nozzle of the flow channel are kept coaxial.

5. A plunger rod device for a flow channel system in a vacuum induction furnace according to claim 1, characterized in that, A sealing ring is provided between the contact surface of the hydraulic cylinder and the sealing seat.

6. A plunger rod device for a flow channel system in a vacuum induction furnace according to claim 1, characterized in that, The load-bearing flange of the stop flange is made of graphite bronze.

7. A plunger rod device for a flow channel system in a vacuum induction furnace according to claim 1, characterized in that, During pouring, the hydraulic cylinder drives the push rod downward via the coupling, striking the bearing flange of the stop flange. The support column of the stop flange moves downward. During the downward movement of the support column, the rocker arm drives the two rod arms to move upward axially, which in turn drives the plunger rod upward via the transmission plate, moving it away from the pouring nozzle of the flow channel. When pouring stops, the hydraulic cylinder drives the push rod to retract via the coupling, stopping the pressure applied to the stop flange. The plunger actuator returns to its initial state, and the plunger rod moves downward under the action of gravity to block the pouring nozzle of the flow channel.

8. A plunger rod device for a flow channel system in a vacuum induction furnace according to claim 1, characterized in that, The hydraulic drive assembly further includes a first solenoid directional valve, which has a first hydraulic interface and a second hydraulic interface. The hydraulic cylinder includes an upper cylinder chamber, a piston, and a lower cylinder chamber. The upper cylinder chamber is provided with an upper hydraulic port, and the lower cylinder chamber is provided with a lower hydraulic port. The upper hydraulic port of the upper cylinder chamber is connected to the first hydraulic port of the first electromagnetic directional valve through the upper reciprocating air path; the lower hydraulic port of the lower cylinder chamber is connected to the second hydraulic port of the first electromagnetic directional valve through the lower reciprocating air path. The first electromagnetic directional valve communicates with the hydraulic controller, which controls the direction of movement of the hydraulic cylinder by controlling the first electromagnetic directional valve.

9. A plunger rod device for a flow channel system in a vacuum induction furnace according to claim 8, characterized in that, It also includes a bladder accumulator, the outlet of which is connected to the upper and lower reciprocating air circuits of the hydraulic cylinder via a second solenoid directional valve. The outlet of the bladder accumulator is flow-controlled via a throttle valve. The bladder accumulator is switched on and off via a manual plate ball valve. The second solenoid directional valve communicates with the hydraulic controller, which controls whether the bladder accumulator is used for operation by controlling the second solenoid directional valve.

10. A plunger rod device for a flow channel system in a vacuum induction furnace according to claim 8 or 9, characterized in that, It also includes a third electromagnetic directional valve. The upper cylinder chamber is equipped with an upper proximity switch, and the lower cylinder chamber is equipped with a lower proximity switch. The third electromagnetic directional valve is connected to the upper reciprocating air path and the lower reciprocating air path respectively. The third electromagnetic directional valve is equipped with a first control signal terminal corresponding to the upper reciprocating air path interface and a second control signal terminal corresponding to the lower reciprocating air path interface. The upper proximity switch, the lower proximity switch, the first control signal terminal, and the second control signal terminal all communicate with the hydraulic controller through signal terminals. The hydraulic controller controls the third electromagnetic directional valve to switch the entire hydraulic drive assembly on and off.

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