A rotary kiln pusher limiting device and method

Abstract

This invention discloses a rotary kiln pusher limiting device and method. The device is located outside the material cylinder and includes: a turntable, a winding reel, and a spring arranged coaxially in sequence; the turntable has multiple perforated holes around its circumference; the winding reel is fixedly connected to the turntable; a steel cable is wound around the winding reel and its free end is connected to the pusher; when the pusher moves forward, the winding reel rotates under the traction of the steel cable, causing the turntable and the spring to rotate synchronously, and the spring to tighten; when the pusher moves backward, the spring to recover, and the turntable and the winding reel rotate synchronously under the drive of the spring, with the steel cable wound around the winding reel; a proximity switch is located on one side of the turntable, and the proximity switch obtains a perforated signal each time it scans a perforated hole of the turntable, and obtains a non-perforated signal each time it scans a non-perforated part of the turntable; the controller accumulates the number of different signal counts to obtain the number of revolutions of the turntable, calculates the actual forward or backward displacement of the pusher by combining the circumference of the winding reel, and determines whether the pusher has reached its destination based on the actual displacement.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of processing solid waste by using a rotary kiln, in particular to a rotary kiln push head limiting device and method. BACKGROUND

[0002] Thanks to the high reduction rate, good emission indicators and strong adaptability, the domestic hazardous solid waste treatment mostly chooses the rotary furnace incineration method. In the process of treatment, the hazardous solid waste needs to be pushed into the furnace by the push head. In order to avoid the push head from entering the furnace too much, the push head needs to be limited.

[0003] At present, some limit the push head by contact limiting, that is, a blocking mechanism is arranged in the direction of the push head, and the push head stops when it contacts the blocking mechanism. However, this method often causes great impact on the blocking mechanism, resulting in damage or falling of the blocking mechanism. Some limit the push head by arranging a magnetic switch at the corresponding position in the barrel. Since the temperature in the barrel is as high as about 120 DEG C, the high temperature has a bad effect on the magnetic switch, often causing the magnetic switch to malfunction and unable to accurately limit the push head. SUMMARY

[0004] In order to solve the problem of easy damage of the contact limiting method and the influence of the magnetic switch by the harsh environment, the purpose of the present application is to provide a rotary kiln push head limiting device and method.

[0005] The present application provides a rotary kiln push head limiting device, which is arranged outside the barrel, and comprises:

[0006] A limiting device body, which comprises a rotating disc, a winding disc and a clockwork spring arranged in sequence, and the rotating disc, the winding disc and the clockwork spring are coaxially arranged; wherein a plurality of hollow holes are arranged in the circumference of the rotating disc; the winding disc is fixedly connected with the rotating disc;

[0007] A steel cable, which is wound on the winding disc, and the free end of the steel cable is connected with the push head; when the push head advances, the winding disc rotates under the traction of the steel cable, and drives the rotating disc and the clockwork spring to rotate synchronously, and the clockwork spring tightens; when the push head retreats, the clockwork spring recovers, and the rotating disc and the winding disc rotate synchronously under the driving of the clockwork spring, and the steel cable is wound on the winding disc;

[0008] A proximity switch, which is arranged on one side of the rotating disc, and in the process of advancing or retreating of the push head, the proximity switch obtains a hollow signal by scanning the hollow hole of the rotating disc once, and obtains a non-hollow signal by scanning the non-hollow part of the rotating disc once, and uploads to the controller;

[0009] a controller, which accumulates the number of the hollow signals and the number of the non-hollow signals respectively to obtain the number of rotations of the rotating disc, calculates the actual displacement of the pusher based on the circumference of the winding disc, and judges whether the pusher is in place according to the actual displacement.

[0010] As a further improvement of the present application, the plurality of hollow holes are arranged at equal intervals along the circumference of the rotating disc.

[0011] As a further improvement of the present application, one end of the clockwork spring is fixed to a second rotating shaft, and the other end of the clockwork spring is fixed to a second fixed rod, wherein the second rotating shaft is the rotating shaft of the clockwork spring itself.

[0012] As a further improvement of the present application, the clockwork spring is externally provided with a dust cover.

[0013] As a further improvement of the present application, the proximity switch is provided with a plurality of redundant proximity switches.

[0014] As a further improvement of the present application, the pusher is connected to a hydraulic cylinder through a hydraulic push rod, and the execution signal of the controller is interlocked with the circuit of the hydraulic cylinder.

[0015] As a further improvement of the present application, a moving trolley is arranged below the hydraulic push rod close to the pusher.

[0016] As a further improvement of the present application, the steel cable between the pusher and the winding disc is arranged on a wire supporting wheel, and the wire supporting wheel is arranged inside and / or outside the barrel.

[0017] The present application also provides a method for limiting the position of a pusher of a rotary kiln, which comprises the following steps:

[0018] When the material is pushed, the pusher advances to drive the steel cable to follow, the winding disc rotates under the traction of the steel cable, and the rotating disc and the clockwork spring rotate synchronously, and the clockwork spring is tightened.

[0019] The proximity switch scans the hollow holes and non-hollow parts of the rotating disc to obtain hollow signals and non-hollow signals, and uploads them to the controller, and the controller accumulates the number of the hollow signals and the number of the non-hollow signals respectively to obtain the number of rotations of the rotating disc.

[0020] The controller calculates the actual advancing displacement of the pusher based on the number of rotations of the rotating disc and the circumference of the winding disc, and compares the actual advancing displacement with the preset advancing displacement of the pusher.

[0021] When the actual advancing displacement reaches the preset advancing displacement, the controller controls the hydraulic cylinder to stop working.

[0022] After the material is pushed out, the pusher head retracts, causing the steel cable to move accordingly. The tightened spring begins to return to its initial state, and the turntable and winding reel rotate accordingly.

[0023] The proximity switch scans the perforated and non-perforated parts of the turntable to obtain perforated and non-perforated signals, and uploads them to the controller. The controller accumulates the number of times the perforated and non-perforated signals are received to obtain the number of revolutions of the turntable.

[0024] The controller calculates the actual backward displacement of the pusher head based on the number of rotations of the turntable and the circumference of the winding disc, and compares the actual backward displacement with the preset backward displacement of the pusher head.

[0025] When the actual backward displacement reaches the preset backward displacement, the controller controls the hydraulic cylinder to stop operating.

[0026] As a further improvement of the present invention, the proximity switch scans the perforated and non-perforated parts of the turntable to obtain perforated and non-perforated signals, and uploads them to the controller. The controller accumulates the number of times the received perforated and non-perforated signals are received to obtain the number of revolutions of the turntable, including:

[0027] The proximity switch emits light, which then illuminates the turntable.

[0028] During the rotation of the turntable, the proximity switch transmits to the controller the number of times the light passes through the perforated holes of the turntable and the number of times the light shines on the non-perforated parts of the turntable.

[0029] The controller accumulates the number of times the light passes through the perforated holes of the turntable and the number of times the light shines on the non-perforated parts of the turntable, and combines this with the number of perforated holes of the turntable to determine the number of rotations of the turntable.

[0030] The beneficial effects of the present invention are as follows: by setting the limiting device outside the barrel, the adverse effects of high temperature or vibration on the limiting device can be avoided; at the same time, the proximity switch can be used to position the pusher head in a non-contact manner, avoiding damage to the limiting device caused by the impact of the pusher head. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a cross-sectional view of a limiting device for a rotary kiln pusher according to an embodiment of the present invention;

[0033] Figure 2 This is a front view of a limiting device for a rotary kiln pusher according to an embodiment of the present invention;

[0034] Figure 3 This is a rear view of a limiting device for a rotary kiln pusher according to an embodiment of the present invention;

[0035] Figure 4 This is a schematic diagram of the assembly of a limiting device and a pusher for a rotary kiln according to an embodiment of the present invention.

[0036] Figure 5 This is a schematic diagram illustrating the state of a rotary kiln pusher limiting device during the pusher's movement, as described in an embodiment of the present invention.

[0037] Figure 6 This is a schematic flowchart of a rotary kiln pusher limiting method according to an embodiment of the present invention.

[0038] In the picture,

[0039] 1. Material cylinder; 2. Push head; 3. Traveling trough; 4. Moving trolley; 5. Hydraulic push rod; 6. Wire support wheel; 7. Steel cable; 8. Limiting device body; 801. Turntable; 802. First rotating shaft; 803. First fixing rod; 804. Proximity switch; 805. Winding reel; 806. Dust cover; 807. Second fixing rod; 808. Second rotating shaft; 809. Adjusting bolt; 810. Spring. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0042] Furthermore, the terminology used in the description of this invention is for illustrative purposes only and is not intended to limit the scope of the invention. The terms "comprising" and / or "including" are used to specify the presence of said elements, steps, operations, and / or components, but do not exclude the presence or addition of one or more other elements, steps, operations, and / or components. The terms "first," "second," etc., may be used to describe various elements, do not represent an order, and do not limit these elements. Moreover, in the description of this invention, unless otherwise stated, "a plurality of" means two or more. These terms are used only to distinguish one element from another. These and / or other aspects become apparent in conjunction with the following drawings, and those skilled in the art will more readily understand the description of the embodiments of the invention. The drawings are used for illustrative purposes only to depict the embodiments of the invention. Those skilled in the art will readily recognize from the following description that alternative embodiments of the structures and methods shown in the invention can be employed without departing from the principles of the invention.

[0043] like Figure 1 As shown in the embodiment of the present invention, a rotary kiln pusher limiting device is provided outside the material cylinder 1. The device includes a limiting device body 8 located outside the material cylinder 1. For example, the limiting device is fixed to the outside of the material cylinder 1 by two first fixing rods 803, thereby avoiding the adverse effects of the high temperature inside the material cylinder 1 on the limiting device, and also preventing waste inside the material cylinder 1 from contaminating the limiting device.

[0044] The limiting device body 8 includes a turntable 801, a winding reel 805, and a spring 810 arranged in sequence, and the turntable 801, the winding reel 805, and the spring 810 are coaxially arranged; the turntable 801 has multiple hollow holes in its circumference so that the proximity switch 804 can count when the scanning turntable 801 is activated; the winding reel 805 is fixedly connected to the turntable 801 so that the turntable 801 rotates synchronously under the drive of the winding reel 805; one end of the spring 810 is fixed to a second rotating shaft 808, and the other end of the spring 810 is fixed to a second fixing rod 807, wherein the second rotating shaft 808 is the rotating shaft of the spring 810 itself.

[0045] For example, when the limiting device body 8 is located on the right side of the material cylinder 1, the turntable 801, the winding reel 805, and the spring 810 are arranged sequentially from left to right. Preferably, the turntable 801 and the winding reel 805 are both fixed to the first rotating shaft 802 via a center, one end of the spring 810 is fixed to the second rotating shaft 808 (i.e., the rotating shaft of the spring 810 itself), and the other end of the spring 810 is fixed to the second fixing rod 807. Figure 3As shown, the left end of the first rotating shaft 802 is rotatably connected to the first fixed rod 803 located on the left side of the limiting device body 8, and the right end of the second rotating shaft 808 is rotatably connected to the first fixed rod 803 located on the right side of the limiting device body 8. The right end of the first rotating shaft 802 and the left end of the second rotating shaft 808 are connected by an adjusting bolt 809. This allows the turntable 801, the winding reel 805, and the spring 810 to rotate synchronously. Simultaneously, the adjusting bolt 809 controls the interval between the winding reel 805 and the spring 810, preventing them from interfering with each other during rotation. The adjusting bolt 809 is also easy to disassemble for replacing the spring 810. Alternatively, the turntable 801, the winding reel 805, and the spring 810 can be fixed on a single rotating shaft. In this case, a barrier needs to be placed between the winding reel 805 and the spring 810 to ensure the interval between them. The appropriate method can be selected based on the working conditions in actual use; this application does not impose specific limitations on this.

[0046] like Figures 1-3 As shown, steel cable 7 is wound around the winding reel 805 and connected to the pusher head 2 through its free end. By using steel cable 7, the displacement of the pusher head 2 can be measured, transferring the measurement from inside the barrel 1 to the outside, thus avoiding the influence of high temperature on the limiting device. At the same time, steel cable 7 is less prone to deformation under high temperatures, making the measurement results more accurate.

[0047] When the pusher 2 moves forward, the steel cable 7 extends accordingly, and the winding reel 805 rotates with the traction of the steel cable 7. The turntable 801 and the spring 810, which are coaxial with the winding reel 805, rotate synchronously, and the spring 810 will be tightened and wound around the second rotating shaft 808.

[0048] When the pusher 2 retracts, the steel cable 7 is in a relaxed state, and the spring 810, which is in a tightened state, begins to gradually return to its initial state, that is, it drives the second rotating shaft 808 to start rotating in the opposite direction, which in turn drives the coaxial turntable 801 and winding reel 805 to rotate, and the steel cable 7 is rewound onto the winding reel 805.

[0049] A proximity switch 804 is located on one side of the turntable 801. During the forward or backward movement of the pusher head 2, the proximity switch 804 obtains a cutout signal each time it scans the cutout of the turntable 801 and a non-cutout signal each time it scans the non-cutout part of the turntable. The different signals (i.e., cutout signal and non-cutout signal) are uploaded to the controller. The controller accumulates the number of times the different signals are received to obtain the number of revolutions of the turntable 801. Combined with the circumference of the winding disc 805, the controller calculates the actual forward or backward displacement of the pusher head 2 and determines whether the pusher head 2 has reached its destination based on the actual displacement.

[0050] When turntable 801 rotates, the light emitted by proximity switch 804 alternately illuminates the perforated and non-perforated areas on turntable 801, generating different signals, which are then uploaded to the controller. The controller accumulates the number of different signals received and calculates the number of rotations of turntable 801 based on the number of perforated holes. The actual forward or backward displacement of push head 2 is then calculated by multiplying the number of rotations by the circumference of winding reel 805. If this actual displacement reaches the preset displacement, indicating that push head 2 has reached its forward or backward position, the controller stops the hydraulic cylinder driving push head 2.

[0051] In one alternative implementation, a plurality of the perforated holes are arranged at equal intervals along the circumference of the turntable 801.

[0052] Optionally, the turntable 801 may have 2, 3, or 4 perforated holes, and the number of perforated holes can be determined according to the size of the turntable 801; this application does not impose a specific limitation. The spacing of multiple perforated holes facilitates scanning and counting by the proximity switch 804. Of course, the perforated holes can also be arranged non-equally; this application does not impose a specific limitation. Optionally, the shape of the perforated holes may be, for example, arc-shaped, circular, or square, and can be adapted according to the operating conditions; this application does not impose a specific limitation. It should be noted that when creating perforated holes, the location of the winding reel 805 should be avoided to prevent the winding reel 805 from blocking light and causing the proximity switch 804 to generate an incorrect signal.

[0053] In one optional embodiment, the mainspring 810 is provided with a dust cover 806. This can prevent dust from the external environment from falling into the mainspring 810 and blocking its stable rotation.

[0054] In one optional implementation, multiple proximity switches 804 are provided and are redundant with each other. Preferably, two proximity switches 804 are provided, one as the main switch and the other as the auxiliary switch. The two proximity switches 804 can be turned on simultaneously, and the controller can perform comprehensive analysis on the signals collected by the two proximity switches 804; alternatively, only one can be turned on, for example, when one proximity switch 804 needs to be inspected, the other can be turned on to scan the turntable 801.

[0055] In one optional implementation, the pusher head 2 is connected to the hydraulic cylinder via a hydraulic push rod 5. The execution signal of the controller is interlocked with the circuit of the hydraulic cylinder; that is, the controller is electrically connected to the hydraulic cylinder. The hydraulic cylinder drives the hydraulic push rod 5, thereby causing the pusher head 2 to move forward or backward. The controller controls the opening and closing of the hydraulic cylinder; when the pusher head 2 has moved forward or backward to its designated position, the controller controls the hydraulic cylinder to close, and the pusher head 2 stops moving.

[0056] Preferred, such asFigures 4-5 As shown, a moving trolley 4 is provided below the hydraulic push rod 5 near the push head 2. A traveling groove 3 is provided on the bottom surface inside the material cylinder 1. The moving trolley 4 moves forward or backward along the traveling groove 3 so that the push head 2 and the hydraulic push rod 5 can move smoothly without deviation.

[0057] In one optional embodiment, the steel cable 7 between the pusher 2 and the winding reel 805 is disposed on the wire support roller 6, which is located inside and / or outside the feed cylinder 1. Preferably, as... Figures 4-5 As shown, there are three cable pulleys 6, one of which is located outside the material cylinder 1 and fixed to the outer wall, and the other two are located inside the material cylinder 1 and fixed to the upper inner wall. More preferably, the cable pulley 6 is a fixed pulley group consisting of two fixed pulleys, with the steel cable 7 located in the groove formed between the two fixed pulleys, facilitating the smooth movement of the steel cable 7; at the same time, the groove formed by the two fixed pulley groups can also clean up waste adhering to the steel cable 7.

[0058] like Figure 6 As shown, the present invention also provides a method for limiting the pusher head of a rotary kiln, the method comprising:

[0059] When pushing the material, the pusher 2 moves forward and drives the steel cable 7 to follow. The winding disc 805 rotates under the traction of the steel cable 7, and drives the turntable 801 and the spring 810 to rotate synchronously. The spring 810 is tightened.

[0060] The proximity switch 804 scans the hollowed-out and non-hollowed-out parts of the turntable 801 to obtain different signals (i.e., hollowed-out signals and non-hollowed-out signals), and uploads the different signals to the controller. The controller accumulates the number of different signals to obtain the number of revolutions of the turntable 801.

[0061] The controller calculates the actual forward displacement of the pusher head 2 based on the number of rotations of the turntable 801 and the circumference of the winding disc 805, and compares the actual forward displacement with the preset forward displacement of the pusher head 2.

[0062] When the actual forward displacement reaches the preset forward displacement, the controller controls the hydraulic cylinder to stop moving;

[0063] After the material is pushed, the pusher head 2 moves backward, causing the steel cable 7 to move accordingly. The tightened spring 810 begins to return to its initial state, and the turntable 801 and the winding reel 805 rotate accordingly.

[0064] The proximity switch 804 scans the hollowed-out and non-hollowed-out parts of the turntable 801 to obtain different signals (i.e., hollowed-out signals and non-hollowed-out signals), and uploads the different signals to the controller. The controller accumulates the number of different signals to obtain the number of revolutions of the turntable 801.

[0065] The controller calculates the actual backward displacement of the pusher head 2 based on the number of rotations of the turntable 801 and the circumference of the winding disc 805, and compares the actual backward displacement with the preset backward displacement of the pusher head 2.

[0066] When the actual backward displacement reaches the preset backward displacement, the controller controls the hydraulic cylinder to stop operating.

[0067] In one optional implementation, the proximity switch 804 scans the perforated and non-perforated portions of the turntable 801 to obtain perforated and non-perforated signals, and uploads them to the controller. The controller accumulates the number of times the perforated and non-perforated signals are received to determine the number of revolutions of the turntable 801, including:

[0068] The proximity switch 804 emits light, causing the light to illuminate the turntable 801;

[0069] During the rotation of the turntable 801, the proximity switch 804 uploads the number of times the light passes through the perforated hole of the turntable 801 and the number of times the light shines on the non-perforated part of the turntable 801 to the controller.

[0070] The controller accumulates the number of times the light passes through the perforated holes of the turntable 801 and the number of times the light shines on the non-perforated parts of the turntable 801, and combines this with the number of perforated holes of the turntable 801 to determine the number of rotations of the turntable 801.

[0071] For example, when the turntable 801 has four perforated holes arranged at equal intervals, during the forward or backward movement of the pusher head 2, the proximity switch 804 emits light to alternately scan the four perforated holes and non-perforated areas (i.e., the intervals between the four perforated holes) of the turntable 801. When the light passes through a perforated hole, the perforation signal is recorded as signal "0" and uploaded to the controller. When the light shines on a non-perforated area of ​​the turntable 801, the non-perforated signal is recorded as signal "1" and uploaded to the controller. The controller counts the number of times it receives signals "0" and "1". The total number of received signals "0" and "1" is obtained by summing the data. Since the turntable 801 generates four signals "0" and four signals "1" per revolution, the number of revolutions of the turntable 801 can be calculated. The number of revolutions of the turntable 801 is then multiplied by the circumference of the winding disc 805 to obtain the actual forward or backward displacement of the pusher 2. The controller compares this actual displacement with the preset displacement. When the actual displacement equals the preset displacement, the controller controls the hydraulic cylinder to stop, thereby limiting the pusher 2 to prevent it from falling into the furnace due to excessive forward movement or damaging the hydraulic push rod 5 due to excessive backward movement.

[0072] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0073] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features but not others included in other embodiments, combinations of features from different embodiments are intended to be within the scope of the invention and form different embodiments. For example, in the claims, any of the claimed embodiments can be used in any combination.

[0074] Those skilled in the art will understand that although the invention has been described with reference to exemplary embodiments, various changes may be made and its elements may be substituted with equivalents without departing from the scope of the invention. Furthermore, many modifications may be made to adapt particular situations or materials to the teachings of the invention without departing from the essential scope of the invention. Therefore, the invention is not limited to the specific embodiments disclosed, but rather the invention will include all embodiments falling within the scope of the appended claims.

Claims

1. A rotary kiln push head stop device, characterized in that, The device is arranged outside the barrel, and the device comprises: The limiting device body comprises a rotating disc, a winding disc and a clockwork spring arranged in sequence, and the rotating disc, the winding disc and the clockwork spring are coaxially arranged; wherein, a plurality of hollow holes are arranged in the circumference of the rotating disc; the winding disc is fixedly connected with the rotating disc; A steel cable is wound on the winding disc, and a free end of the steel cable is connected with a push head; when the push head advances, the winding disc rotates under the traction of the steel cable, and drives the rotating disc and the clockwork spring to rotate synchronously, and the clockwork spring is tightened; when the push head retreats, the clockwork spring recovers, and the rotating disc and the winding disc rotate synchronously under the driving of the clockwork spring, and the steel cable is wound on the winding disc; A proximity switch is arranged on one side of the rotating disc, and during the advancing or retreating of the push head, the proximity switch obtains a hollow signal by scanning the hollow hole of the rotating disc once, obtains a non-hollow signal by scanning the non-hollow part of the rotating disc once, and uploads to a controller; The controller accumulates the number of the hollow signals and the non-hollow signals received respectively to obtain the number of rotations of the rotating disc, calculates the actual displacement of the advancing or retreating of the push head in combination with the circumference of the winding disc, and judges whether the push head advances to the position according to the actual displacement.

2. The apparatus of claim 1, wherein, The plurality of hollow holes are arranged at equal intervals along the circumference of the rotating disc.

3. The apparatus of claim 1, wherein, One end of the clockwork spring is fixed with a second rotating shaft, and the other end of the clockwork spring is fixed with a second fixed rod, wherein the second rotating shaft is the rotating shaft of the clockwork spring itself.

4. The apparatus of claim 1, wherein, A dust cover is arranged outside the clockwork spring.

5. The apparatus of claim 1, wherein, The proximity switch is provided with a plurality of redundancy.

6. The apparatus of claim 1, wherein, The push head is connected with a hydraulic cylinder through a hydraulic push rod, and the execution signal of the controller is interlocked with the circuit of the hydraulic cylinder.

7. The apparatus of claim 6, wherein, A moving trolley is arranged below the hydraulic push rod close to the push head.

8. The apparatus of claim 1, wherein, The steel cable between the push head and the winding disc is arranged on a wire supporting wheel, and the wire supporting wheel is arranged inside and / or outside the barrel.

9. A method of limiting the movement of a pusher head of a rotary kiln according to any one of claims 1 to 8, wherein, The method comprises: When pushing the material, the advancing of the push head drives the steel cable to follow, the winding disc rotates under the traction of the steel cable, and drives the rotating disc and the clockwork spring to rotate synchronously, and the clockwork spring is tightened; The proximity switch scans the hollow hole and the non-hollow part of the rotating disc to obtain the hollow signal and the non-hollow signal, and uploads to the controller, and the controller accumulates the number of the hollow signals and the non-hollow signals received respectively to obtain the number of rotations of the rotating disc; The controller calculates the actual advancing displacement of the push head in combination with the circumference of the winding disc according to the number of rotations of the rotating disc, and compares the actual advancing displacement with the preset advancing displacement of the push head; When the actual advancing displacement reaches the preset advancing displacement, the controller controls the hydraulic cylinder to stop; When the pushing of the material is completed, the retreating of the push head drives the steel cable to follow, and the tightened clockwork spring begins to recover to the initial state, and the rotating disc and the winding disc rotate synchronously under the driving of the clockwork spring; The proximity switch scans the hollow hole and non-hollow part of the rotating disc to obtain hollow signals and non-hollow signals, and uploads them to the controller, which accumulates the number of received hollow signals and non-hollow signals to obtain the number of rotations of the rotating disc; The controller calculates the actual backward displacement of the push head according to the number of rotations of the rotating disc combined with the circumference of the winding reel, and compares the actual backward displacement with the preset backward displacement of the push head; When the actual backward displacement reaches the preset backward displacement, the controller controls the hydraulic cylinder to stop.

10. The method of claim 9, wherein, The proximity switch scans the hollow hole and non-hollow part of the rotating disc to obtain hollow signals and non-hollow signals, and uploads them to the controller, which accumulates the number of received hollow signals and non-hollow signals to obtain the number of rotations of the rotating disc, comprising: The proximity switch emits light rays, so that the light rays irradiate the rotating disc; During the rotation of the rotating disc, the proximity switch uploads the number of times that the light rays pass through the hollow hole of the rotating disc and the number of times that the light rays irradiate the non-hollow part of the rotating disc to the controller; The controller accumulates the number of times that the light rays pass through the hollow hole of the rotating disc and the number of times that the light rays irradiate the non-hollow part of the rotating disc, and obtains the number of rotations of the rotating disc combined with the number of hollow holes of the rotating disc.

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