A portable continuous casting billet heat preservation device

Abstract

The utility model discloses a kind of continuous casting billet heat preservation devices, to realize the dynamic continuous heat preservation of continuous casting billet cutting area. The device includes track installed on concrete foundation, and machine front heat shield device, machine front heat shield detection device, machine rear heat shield device and machine rear heat shield detection device operating on track with fire cutting machine. Machine front and machine rear heat shield device are monitored with the positional relationship of fire cutting machine in real time by detection device, and accurately control respective speed of following, to maintain preset interval distance, realize the dynamic continuous coverage to steel billet cutting area. Heat shield adopts multiple flexible structure, and realizes turning or winding by guiding device. The utility model is accurately controlled by following and flexible structure design, effectively solve the heat loss problem of continuous casting billet cutting area, improve billet quality, reduce energy consumption, and have the advantages such as simple structure, stable operation, strong adaptability.

Description

Technical Field

[0001] This utility model belongs to the field of continuous casting technology, and in particular relates to a traveling continuous casting billet heat preservation device. Background Technology

[0002] Continuous casting technology is a crucial step in modern metallurgical industry, aiming to continuously cast molten metal into solid billets. During continuous casting, especially in the billet cutting area, heat loss occurs because the billet is exposed to air, causing a drop in surface temperature. This temperature drop not only affects the internal quality of the billet but can also lead to defects in subsequent processes such as rolling, and even increase energy consumption.

[0003] Existing continuous casting billet insulation technologies typically employ fixed insulation covers or complex, slow-response following insulation devices. Fixed insulation covers cannot achieve continuous dynamic coverage of the moving billet cutting area, especially during the reciprocating motion of the cutting machine, resulting in poor insulation performance and blind spots. Some following insulation devices, due to their complex transmission and control systems or insufficient flexibility, struggle to adapt to the precise following and rapid turning requirements of the continuous casting billet in the cutting area, thus limiting their application range and insulation efficiency. For example, when the billet turns from the horizontal cutting area to the vertical casting area, fixed or inflexible insulation devices struggle to achieve seamless connection, leading to heat loss. Furthermore, existing equipment faces challenges in maintaining a precise distance from the cutting machine, easily resulting in distance deviations that affect insulation performance or cause equipment interference. Therefore, there is an urgent need for a simple, flexible, fast-responding, and precisely controlled portable heat preservation device and method to solve the problem of insufficient heat preservation in the cutting area of ​​continuous casting billets in the existing technology, to ensure the temperature stability of the billets during the cutting and casting process, to improve product quality and reduce energy consumption. Summary of the Invention

[0004] Purpose of the invention: This utility model aims to provide a traveling continuous casting billet heat preservation device to overcome the problem of insufficient heat preservation in the cutting area of ​​continuous casting billets in the prior art, and to achieve dynamic and continuous coverage of the cutting area of ​​continuous casting billets.

[0005] Technical Solution: This utility model provides a following continuous casting billet heat preservation device, including a track and a front heat preservation cover device, a front heat preservation cover detection device, a rear heat preservation cover device, and a rear heat preservation cover detection device installed on the track. The track is installed on a concrete foundation. The front heat preservation cover device is installed on the inlet side of the flame cutting machine and follows the flame cutting machine on the track at a preset front interval distance. The rear heat preservation cover device is installed on the outlet side of the flame cutting machine and follows the flame cutting machine on the track at a preset rear interval distance. The front heat preservation cover detection device is installed on the rear side of the front heat preservation cover device and is used to detect the positional relationship between the front heat preservation cover device and the flame cutting machine in real time and control the following speed of the front heat preservation cover device to maintain the front interval distance. The rear insulation cover detection device is installed in front of the rear insulation cover device. It is used to detect the positional relationship between the rear insulation cover device and the fire cutting machine and control the following speed of the rear insulation cover device to maintain the rear interval distance, so as to realize the dynamic continuous coverage of the billet cutting area by the front insulation cover device and the rear insulation cover device.

[0006] To further improve the above technical solution, the front insulation cover device includes a transmission device, a front insulation cover, a guide device, and a steel frame. The steel frame is installed on a concrete foundation, the transmission device is installed on the steel frame, the front insulation cover operates under the drive of the transmission device, and the guide device is installed on the steel frame, allowing the front insulation cover device to change from a horizontal to a vertical state.

[0007] Furthermore, the transmission device includes a base, a second motor, a brake, a reducer, and a first drum and a second drum connected by an intermediate coupling and a reducer coupling. The second motor drives the first drum and the second drum to rotate synchronously, with one end of the steel rope wound around the first drum and the second drum respectively, and the other end connected to the front heat insulation cover.

[0008] Furthermore, the track includes a horizontal track and an arc track. The horizontal track is used to support the rear heat insulation cover device to move linearly, and the arc track is connected between one end of the horizontal track and the gear cylinder device, and guides the rear heat insulation cover device to transition from horizontal movement to vertical winding movement.

[0009] Furthermore, the rear insulation cover device includes a second transmission device, a rear insulation cover, a geared cylinder device, and a support. The support is installed on a concrete foundation, and the second transmission device and the geared cylinder device are installed on the support. The second transmission device drives the geared cylinder device to rotate. The toothed grooves on the outer circumferential surface of the geared cylinder device mesh with the connecting shaft on the rear insulation cover to form a track, thereby enabling the rear insulation cover to be rolled up and unfolded along the track.

[0010] Furthermore, both the front and rear insulation covers are composed of modular insulation cover units, and adjacent insulation cover units are connected by connecting shafts to form a flexible connection; each insulation cover unit includes an end beam and a cover body, the cover body is a hollow structure, and its interior is filled with thermal insulation material; the connecting shaft includes a central shaft and roller sleeves fitted at both ends of the central shaft.

[0011] Furthermore, a first motor is installed on the end beam of the rear insulation cover to provide auxiliary traction when the rear insulation cover device is deployed, or to maintain the tension of the rear insulation cover when it is rolled back.

[0012] Furthermore, the front insulation cover detection device includes a front support, a front laser rangefinder, and a front reflector. The front support is fixed on the front insulation cover device, the front laser rangefinder is mounted on the front support, and the front reflector is mounted on the flame cutting machine. The emission port of the front laser rangefinder faces the front reflector. The distance between the front insulation cover device and the flame cutting machine is calculated based on the reading of the front laser rangefinder: for example, if the distance from the end face of the laser emission port of the front laser rangefinder to the front face of the front insulation cover detection device is Sqb, the distance from the front reflector to the rear face of the flame cutting machine is Sqh, and the reading of the front laser rangefinder is Sqr, then the distance between the front insulation cover device and the flame cutting machine is Sq = Sqr - Sqb - Sqh. The rear insulation cover detection device includes a rear support, a rear laser rangefinder, and a rear reflector. The rear support is fixed on the rear insulation cover device, the rear laser rangefinder is mounted on the rear support, and the rear reflector is mounted on the fire cutter. The emission port of the rear laser rangefinder faces the rear reflector. The distance between the rear insulation cover device and the fire cutter is calculated based on the reading of the rear laser rangefinder: if the distance from the end face of the laser emission port of the rear laser rangefinder to the front face of the rear insulation cover detection device is Shb, the distance from the rear reflector to the rear face of the fire cutter is Shh, and the reading of the rear laser rangefinder is Shr, then the distance between the rear insulation cover device and the fire cutter is Sh = Shr - Shb - Shh.

[0013] Beneficial effects: Compared with the prior art, the advantages of this utility model are: Achieving dynamic and continuous heat preservation: Through precise follow-up control of the heat preservation cover devices at the front and rear of the machine, dynamic and continuous coverage of the cutting area of ​​the continuous casting billet is achieved, effectively avoiding the heat preservation blind spots existing in traditional fixed heat preservation covers and minimizing the heat loss of the billet.

[0014] Improve insulation efficiency and billet quality: Continuous and stable insulation effectively suppresses the drop in surface temperature of the billet in the cutting area, helps to maintain the temperature uniformity inside and outside the billet, thereby improving the overall quality of the billet and reducing defects in subsequent processing.

[0015] High structural flexibility and wide adaptability: The front and rear insulation covers adopt a multi-section flexible structure design, and achieve small-radius turning or rolling through the guide device and toothed cylinder device, so that it can adapt to the movement trajectory of the continuous casting billet in the horizontal and vertical directions, effectively utilize space and reduce the equipment footprint.

[0016] High control precision and stable operation: The positional relationship with the fire-cutting machine is monitored in real time by the front and rear detection devices, and the speed is precisely adjusted according to the distance deviation to ensure that the heat insulation cover device always maintains the preset interval distance, and the operation is smooth and reliable, avoiding problems such as equipment interference or poor heat insulation effect.

[0017] Reduced energy consumption: Effective heat preservation reduces heat loss, which can directly reduce energy consumption in the continuous casting process and has a significant energy-saving effect.

[0018] Easy to install and simple to maintain: The track is installed on a concrete foundation, and the reasonable structural design makes the installation and daily maintenance of the device relatively simple and convenient.

[0019] High scalability: The transmission and insulation cover proposed in this utility model have good scalability. The insulation cover can be adjusted to chain drive, hydraulic drive or sliding form according to actual needs, which improves the adaptability and application range of the equipment. Attached Figure Description

[0020] Figure 1 This is a structural diagram of a continuous casting billet heat preservation device. Figure 2 Elevation view of the front insulation cover device; Figure 3 This is a cross-sectional view of the machine front insulation cover device; Figure 4 This is a schematic diagram of the structure of transmission device one; Figure 5 Elevation view of the rear thermal insulation cover device; Figure 6 Cross-sectional view of the rear thermal insulation cover device; Figure 7 A schematic diagram of the structure of the rear thermal insulation cover; Figure 8 A schematic diagram of the structure of the middle beam of the rear insulation cover; Figure 9 This is a schematic diagram of the connecting shaft in the rear insulation cover of the machine.

[0021] The components are as follows: 1. Fire cutting machine; 2. Front insulation cover device; 3. Front insulation cover detection device; 4. Track; 5. Rear insulation cover device; 6. Rear insulation cover detection device; 7. Transmission device one; 8. Front insulation cover; 9. Guide device; 10. Steel frame; 11. Transmission device two; 12. Rear insulation cover; 13. Gear cylinder device; 14. Support; 121. Cover body; 122. End beam; 123. Wheel; 124. First motor; 125. Central shaft; 126. Roller sleeve; 701. Base; 702. First drum; 703. Intermediate coupling; 704. Second drum; 705. Reducer coupling; 706. Reducer; 707. Second motor; 708. Brake. Detailed Implementation

[0022] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings, but the protection scope of this utility model is not limited to the described embodiments.

[0023] Example 1: As Figure 1 The accompanying continuous casting billet insulation device shown includes: a front insulation cover device 2, a front insulation cover detection device 3, a track 4, a rear insulation cover device 5, and a rear insulation cover detection device 6. The track 4 is installed on a concrete foundation, and the front insulation cover device 2, the flame cutter 1, and the rear insulation cover device 5 run on the track 4. The front insulation cover device 2 is installed on the inlet side of the flame cutter 1 and follows the flame cutter 1 on the track 4 at a preset front-to-back interval. The rear insulation cover device 5 is installed on the outlet side of the flame cutter 1 and follows the flame cutter 1 on the track 4 at a preset rear-to-back interval. The front insulation cover detection device 3 is installed behind the front insulation cover device 2 and is used to detect the positional relationship between the front insulation cover device 2 and the flame cutter 1 in real time, and to control the following speed of the front insulation cover device 2 to maintain the front-to-back interval. The rear insulation cover detection device 6 is installed in front of the rear insulation cover device 5. It is used to detect the positional relationship between the rear insulation cover device 5 and the fire cutting machine 1, and to control the following speed of the rear insulation cover device 5 to maintain the rear interval distance, thereby realizing dynamic and continuous coverage of the billet cutting area.

[0024] Track 4 includes a horizontal track and an arc track, which together form the running path of the insulation cover chain. The horizontal track is used to support the long-distance linear movement of the rear insulation cover device 5, while the arc track is connected between one end of the horizontal track and the toothed cylinder device 13, which plays a guiding role, so that the rear insulation cover device 5 can smoothly transition from horizontal movement to vertical winding movement.

[0025] like Figure 2 , Figure 3As shown, the front insulation cover device 2 consists of a transmission device 7, a front insulation cover 8, a guide device 9, and a steel frame 10. The steel frame 10 is installed on the foundation, the transmission device 7 is installed on the steel frame 10, the front insulation cover 8 runs under the drive of the transmission device 7, and the guide device 9 is installed on the steel frame 10. The front insulation cover device 2 turns along the guide device 9.

[0026] like Figure 4 As shown, the transmission device 7 includes a base 701, a second motor 707, a brake 708, a reducer 706, and a first drum 702 and a second drum 704 connected by an intermediate coupling 703 and a reducer coupling 705. The second motor 707 drives the first drum 702 and the second drum 704 to rotate synchronously. One end of the steel rope is wound around the first drum 702 and the second drum 704 respectively, and the other end is connected to the connecting shaft of the first section of the insulation cover 8 in the front of the machine. The design of double drums and double steel ropes can make the front insulation cover 8 receive balanced force during lifting and lowering, and run more smoothly.

[0027] like Figure 5 As shown, the rear insulation cover device 5 consists of a transmission device 11, a rear insulation cover 12, a gear cylinder device 13, and a support 14. The support 14 is mounted on a base, and the transmission device 11 and the gear cylinder device 13 are mounted on the support 14. The gear cylinder device 13 is the core component that enables the rear insulation cover 12 to roll up and unfold. Figure 6 As shown, the transmission device 2 11 provides rotational power to the gear cylinder device 13. The outer peripheral surface of the gear cylinder device 13 is provided with a tooth groove as a transmission structure. The shape and size of the tooth groove match the roller sleeve of the connecting shaft on the rear heat insulation cover 12. When the gear cylinder device 13 rotates, the tooth groove can reliably mesh with the roller sleeve, thereby driving the entire rear heat insulation cover device 5 to move.

[0028] When the rear insulation cover device is deployed, the speed of the first motor 124 is adjusted to be slightly faster than the speed of the second transmission device, about 0.5-1.5% ahead; when the rear insulation cover device is rolled back, the speed of the first motor 124 is adjusted to be slightly slower than the speed of the second transmission device, about 0.5-1.5% behind, to ensure coordinated operation.

[0029] The front insulation cover 8 and the rear insulation cover 12 have the same structure, both adopting a multi-section flexible structure to achieve small-radius turning of the insulation cover. The front insulation cover 8 can turn 90° from horizontal operation to vertical operation through the guide device 9, reducing the space occupied by the equipment; the rear insulation cover 12 can rotate and be attached to the outer ring of the gear cylinder through the gear cylinder device 13 from horizontal operation.

[0030] like Figures 7 to 9As shown, the front insulation cover 8 or the rear insulation cover 12 is composed of modular insulation cover units. Adjacent insulation cover units are connected by connecting shafts, which specifically include a central shaft 125 and roller sleeves 126 fitted at both ends of the central shaft 125. Each insulation cover unit includes an end beam 122 and a cover body 121. A first motor 124 and wheels 123 are mounted on the end beam 122. The first motor 124 independently drives the wheels 123, enabling the cover body 121 to move actively on a horizontal track, providing auxiliary traction or maintaining tension for the entire rear insulation cover 12 when deployed. To achieve the insulation effect, the cover body 121 is a hollow structure, and its interior can be filled with high-efficiency thermal insulation materials, such as ceramic fiber cotton or aerogel felt, to maximize the prevention of heat loss to the surrounding environment.

[0031] A front insulation cover detection device 3 is installed on the front insulation cover device 2 to detect the positional relationship between the front insulation cover device 2 and the fire cutting machine 1, and to control the following speed of the front insulation cover device 2. A rear insulation cover detection device 6 is installed on the rear insulation cover device 5 to detect the positional relationship between the rear insulation cover device 5 and the fire cutting machine 1, and to control the following speed of the rear insulation cover device 5.

[0032] The front insulation cover detection device includes a front bracket, a front laser rangefinder, and a front reflector. The front bracket is fixed on the front insulation cover device, the front laser rangefinder is mounted on the front bracket, and the front reflector is mounted on the flame cutting machine. The emission port of the front laser rangefinder faces the front reflector. The distance between the front insulation cover device and the flame cutting machine is calculated based on the reading of the front laser rangefinder: if the distance from the end face of the laser emission port of the front laser rangefinder to the front face of the front insulation cover detection device is Sqb, the distance from the front reflector to the rear face of the flame cutting machine is Sqh, and the reading of the front laser rangefinder is Sqr, then the distance between the front insulation cover device and the flame cutting machine is Sq = Sqr - Sqb - Sqh.

[0033] The rear insulation cover detection device includes a rear support, a rear laser rangefinder, and a rear reflector. The rear support is fixed on the rear insulation cover device, the rear laser rangefinder is mounted on the rear support, and the rear reflector is mounted on the fire cutter. The emission port of the rear laser rangefinder faces the rear reflector. The distance between the rear insulation cover device and the fire cutter is calculated based on the reading of the rear laser rangefinder: if the distance from the end face of the laser emission port of the rear laser rangefinder to the front face of the rear insulation cover detection device is Shb, the distance from the rear reflector to the rear face of the fire cutter is Shh, and the reading of the rear laser rangefinder is Shr, then the distance between the rear insulation cover device and the fire cutter is Sh = Shr - Shb - Shh.

[0034] The following speed adjustment and control of the front / rear insulation cover device employs a PID algorithm, which consists of three parts: proportional, integral, and derivative. Proportional control is achieved through the proportional gain parameter. By adjusting the proportional gain, the response speed of the front / rear insulation cover device to distance deviations can be controlled, thus achieving rapid positioning and accurate tracking. Integral control reduces the system's steady-state error. When the positioning distance deviation of the front / rear insulation cover device changes, the integral term gradually accumulates, increasing the control quantity and thus adjusting until the deviation is eliminated. Derivative control predicts the system's dynamic behavior. When the positioning distance deviation of the front / rear insulation cover device changes, derivative control can quickly respond to this change, producing a suppression effect to prevent system overshoot and oscillation, thereby improving system stability.

[0035] The front insulation cover device 2 follows the fire-cutting machine 1 in real time (the fire-cutting machine moves forward when to the right and backward when to the left). The following control method is as follows: the front insulation cover detection device 3 detects the running speed of the fire-cutting machine 1 and the positional relationship of the front insulation cover device 2 in real time. During normal following, the speed of the front insulation cover device 2 is consistent with the speed of the fire-cutting machine 1, and the distance between them remains constant. When a change in the distance between them is detected that exceeds the set value, adjustments are made in two ways: First, the front insulation cover device 2 follows the fire-cutting machine 1 forward: if the distance between them increases, the front insulation cover device 2 is accelerated; if the distance between them decreases, the front insulation cover device 2 is decelerated, until the speeds are consistent and the distance is within the set value. Second, the front insulation cover device 2 follows the fire-cutting machine 1 backward: if the distance between them increases, the front insulation cover device 2 is decelerated; if the distance between them decreases, the front insulation cover device 2 is accelerated, until the speeds are consistent and the distance is within the set value.

[0036] The rear insulation cover device 5 follows the fire-cutting machine 1 in real time (the fire-cutting machine moves forward when to the right and backward when to the left). The following control method is as follows: the rear insulation cover detection device 6 detects the running speed of the fire-cutting machine 1 and the positional relationship of the rear insulation cover device 5 in real time. During normal following, the speed of the rear insulation cover device 5 is consistent with the speed of the fire-cutting machine 1, and the distance between them remains constant. When a change in the distance between them is detected that exceeds the set value, adjustments are made in two ways: First, the rear insulation cover device 5 follows the fire-cutting machine 1 forward: if the distance between them increases, the rear insulation cover device 5 is decelerated; if the distance between them decreases, the rear insulation cover device 5 is accelerated, until the speeds are consistent and the distance is within the set value. Second, the rear insulation cover device 5 follows the fire-cutting machine 1 backward: if the distance between them increases, the rear insulation cover device 5 is accelerated; if the distance between them decreases, the rear insulation cover device 5 is decelerated, until the speeds are consistent and the distance is within the set value.

[0037] The above is only one preferred embodiment of this utility model. There are other embodiments: for example, chain drive, hydraulic drive or other forms of drive are used, such as the heat insulation cover is in a sliding form, etc.

[0038] As described above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be construed as limiting the present invention itself. Various changes in form and detail may be made to the present invention without departing from the spirit and scope of the appended claims.

Claims

1. A traveling continuous casting billet heat preservation device, characterized in that, Includes a track (4) and a front insulation cover device (2), a front insulation cover detection device (3), a rear insulation cover device (5), and a rear insulation cover detection device (6) installed on the track (4), wherein, The track (4) is installed on a concrete foundation. The front insulation cover device (2) is installed on the inlet side of the fire cutting machine (1) and follows the fire cutting machine (1) on the track (4) at a preset front interval distance. The rear insulation cover device (5) is installed on the outlet side of the fire cutting machine (1) and follows the fire cutting machine (1) on the track (4) at a preset rear interval distance. The front insulation cover detection device (3) is installed on the rear side of the front insulation cover device (2) and is used to detect the front insulation cover device (2) and its position in real time. The positional relationship of the fire cutter (1) is used to control the following speed of the front heat insulation cover device (2) to maintain the front gap distance. The rear heat insulation cover detection device (6) is installed in front of the rear heat insulation cover device (5) to detect the positional relationship between the rear heat insulation cover device (5) and the fire cutter (1) to control the following speed of the rear heat insulation cover device (5) to maintain the rear gap distance, so as to realize the dynamic continuous coverage of the billet cutting area by the front heat insulation cover device (2) and the rear heat insulation cover device (5).

2. The accompanying continuous casting billet heat preservation device according to claim 1, characterized in that, The front insulation cover device (2) includes a transmission device (7), a front insulation cover (8), a guide device (9), and a steel frame (10). The steel frame (10) is installed on a concrete foundation. The transmission device (7) is installed on the steel frame (10). The front insulation cover (8) operates under the drive of the transmission device (7). The guide device (9) is installed on the steel frame (10). The front insulation cover device (2) changes from a horizontal state to a vertical state through the guide device (9).

3. The accompanying continuous casting billet heat preservation device according to claim 2, characterized in that, The transmission device 1 (7) includes a base (701), a second motor (707), a brake (708), a reducer (706), and a first drum (702) and a second drum (704) connected by an intermediate coupling (703) and a reducer coupling (705). The second motor (707) drives the first drum (702) and the second drum (704) to rotate synchronously. One end of the steel rope is wound on the first drum (702) and the second drum (704) respectively, and the other end is connected to the front heat insulation cover (8).

4. The accompanying continuous casting billet heat preservation device according to claim 3, characterized in that, The track (4) includes a horizontal track and an arc track. The horizontal track is used to support the rear heat insulation cover device (5) to move in a straight line. The arc track is connected between one end of the horizontal track and the gear cylinder device (13) and guides the rear heat insulation cover device (5) from horizontal movement to vertical winding movement.

5. The accompanying continuous casting billet heat preservation device according to claim 4, characterized in that, The rear insulation cover device (5) includes a transmission device two (11), a rear insulation cover (12), a gear cylinder device (13), and a bracket (14). The bracket (14) is installed on a concrete foundation. The transmission device two (11) and the gear cylinder device (13) are installed on the bracket (14). The transmission device two (11) drives the gear cylinder device (13) to rotate. The tooth groove on the outer peripheral surface of the gear cylinder device (13) meshes with the connecting shaft on the rear insulation cover (12) to achieve the rolling up and unfolding of the rear insulation cover (12) along the track.

6. The accompanying continuous casting billet heat preservation device according to claim 5, characterized in that, The front insulation cover (8) and the rear insulation cover (12) are both composed of modular insulation cover units. Adjacent insulation cover units are connected by a connecting shaft to form a flexible connection. The insulation cover unit includes an end beam and a cover body. The cover body (121) is a hollow structure and is filled with thermal insulation material. The connecting shaft includes a central shaft (125) and roller sleeves (126) fitted at both ends of the central shaft (125).

7. The accompanying continuous casting billet heat preservation device according to claim 6, characterized in that, A first motor (124) is installed on the end beam (122) of the rear heat insulation cover (12) to provide auxiliary traction force when the rear heat insulation cover device (5) is deployed, or to maintain the tension of the rear heat insulation cover (12) when it is rolled back.

8. The accompanying continuous casting billet heat preservation device according to claim 1, characterized in that, The front heat insulation cover detection device includes a front support, a front laser rangefinder, and a front reflector. The front support is fixed on the front heat insulation cover device, the front laser rangefinder is mounted on the front support, and the front reflector is mounted on the fire cutting machine. The emission port of the front laser rangefinder faces the front reflector. The rear insulation cover detection device includes a rear support, a rear laser rangefinder, and a rear reflector. The rear support is fixed on the rear insulation cover device, the rear laser rangefinder is mounted on the rear support, and the rear reflector is mounted on the fire cutting machine. The emission port of the rear laser rangefinder faces the rear reflector.

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