A trailing support device and support frame set

Abstract

The utility model belongs to the technical field of the structure of traction type supporting device, specifically discloses a traction type supporting device and supporting support group. Among them, traction type supporting device includes roof beam, base, stand, traction drive part, transmission rod and gangue baffle, and the base is used for placing ground, the stand is provided with at least two, the upper end of stand is connected with roof beam, and the lower end is connected with base, and the stand can retract along the vertical direction, one end of traction drive part is connected with the front end of base, along the length direction of transmission rod, transmission rod is provided with a plurality of connecting parts for switching cooperation, one connecting part is connected with the end of traction drive part away from base, the gangue baffle is provided with a plurality of, and the gangue baffle and roof beam are fixedly connected, one gangue baffle is fixed in the end of roof beam away from traction drive part, and the rest gangue baffle is set up in the both sides or one side of roof beam. Traction type supporting device can avoid the collapse of the inside of passageway, improve the supporting effect, and facilitate recycling and multiple use.

Description

Technical Field

[0001] This utility model relates to the field of coal mining technology, and in particular to a traction support device and a support bracket assembly. Background Technology

[0002] Referring to utility model patent application number 202221887991.6, a movable device for a cover support is disclosed. The movable device for the cover support includes: a top beam with a supporting surface; columns, including a first column and a second column, which are spaced apart and supported on the side of the top beam away from the supporting surface, and the first column and the second column are located at two ends of the top beam, respectively, and both the first column and the second column can be telescopically set; a T-shaped base, including a horizontal beam and a vertical beam, which are vertically connected, and one end of the vertical beam is connected to the center of the horizontal beam, the end of the first column away from the top beam is connected to the connection point between the vertical beam and the horizontal beam, and the end of the second column away from the top beam is connected to the other end of the vertical beam.

[0003] According to the disclosed content of the above plan, currently, most longwall mining faces in China use dedicated triangular shield supports for retreat, combined with round logs and timber (arranged in a grid) for goaf support, to complete the retreat of the shield supports. However, the aforementioned passage support technology has many inconveniences: First, the support structure lacks flexibility in adjustment. Traditional support often uses disposable wooden poles of fixed height (such as "grid" structure wooden poles). This structure has poor fit with the top surface of the passage, easily resulting in support gaps, which can lead to local collapses. Second, although traditional disposable wooden pole support is low in cost, it has weak support strength and high consumption, which increases material costs and generates a large amount of construction waste. Utility Model Content

[0004] The purpose of this invention is to provide a traction-type support device to solve the technical problems of insufficient support capacity and non-recyclability caused by the use of wooden poles with a "grid" structure for support in the prior art.

[0005] To achieve the above objectives, the first aspect of this utility model provides a traction-type support device, including a top beam, a base, columns, a traction drive component, a transmission rod, and rock-blocking plates. The base is used to place the device on the ground. At least two columns are provided, with the upper end of each column connected to the top beam and the lower end connected to the base. The columns are extendable and retractable in a vertical direction. One end of the traction drive component is connected to the front end of the base. Along the length of the transmission rod, the transmission rod is provided with multiple connecting parts for transition and engagement, one of which is connected to the end of the traction drive component away from the base. Multiple rock-blocking plates are provided, with each rock-blocking plate fixedly connected to the top beam. One rock-blocking plate is fixed to the end of the top beam away from the traction drive component, and the remaining rock-blocking plates are provided on both sides or one side of the top beam.

[0006] Preferably, each column is a first hydraulic cylinder, which includes a first cylinder body and a first piston rod. The first piston rod is telescopically disposed within the first cylinder body, the first cylinder body is fixed to the base, and the end of the first piston rod is connected to the top beam.

[0007] Preferably, the base is fixedly connected to a frame, the frame is provided with multiple mounting positions, and multiple columns are fixed in the mounting positions, with the multiple columns spaced apart.

[0008] Preferably, the traction drive component is a second hydraulic cylinder, which includes a second cylinder body and a second piston rod. The second piston rod is telescopically disposed within the second cylinder body. One end of the second cylinder body away from the second piston rod is rotatably connected to the end of the base, and the other end is rotatably connected to the transmission rod, so that the second hydraulic cylinder can swing in a vertical plane.

[0009] Preferably, there are multiple traction drive components, and the multiple traction drive components are arranged in parallel.

[0010] The second aspect of this utility model provides a support frame assembly, which includes the aforementioned traction support device and a first shield support. The traction support device is provided with at least one component, and the first shield support is provided with a connecting rod. The connecting rod is telescopically extendable along the telescopic direction of the traction drive component. One end of the connecting rod is rotatably connected to the first shield support, and the other end is rotatably connected to the connecting part, so that the connecting rod can swing in a vertical plane. The traction support device is located on both sides or one side of the first shield support, and the retaining plate on one side of the traction support device is attached to the inner side of the channel.

[0011] Preferably, the connecting part includes two spaced-apart first connecting plates and a pin. A first through hole is provided through the center of each first connecting plate, and the pin passes through and is rotatably connected to the first through hole. A second connecting plate is provided at one end of the traction drive near the transmission rod. The second connecting plate has a second through hole and is embedded between the two first connecting plates. The second through hole corresponds to the position of the first through hole, and the pin can pass through and is rotatably connected to the second through hole. A rotating seat is fixedly connected to the end of the connecting rod. The rotating seat has a groove and a third through hole. One of the first connecting plates is embedded in the groove, and the third through hole corresponds to the position of the first through hole. The pin can pass through and is rotatably connected to the third through hole.

[0012] Preferably, multiple first cover supports are provided, and the multiple first cover supports are arranged side by side. A second cover support is provided between two first cover supports. The second cover support is provided with a telescopic T-shaped support. The T-shaped support includes a vertical beam and a horizontal beam. One end of the vertical beam is rotatably connected to the front end of the second cover support, and the other end is fixedly connected to the middle of the horizontal beam. Both ends of the horizontal beam can be detachably fixedly connected to the end of the transmission rod.

[0013] Preferably, the crossbeam is provided with a plurality of connecting parts, wherein the connecting rod can be rotatably connected to the connecting part of the crossbeam or the connecting part of the transmission rod.

[0014] The advantages of the traction support device and the support bracket assembly with the traction support device provided by this utility model are as follows: 1. The traction support device replaces the original disposable "grid" structure wooden poles to reduce material consumption; 2. The traction support device is installed on the side of the shield support and fits against the inner wall of the passage to prevent the inner side of the passage from collapsing and improve the support effect. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the traction support device according to the first aspect of the present utility model; Figure 2 This is a schematic diagram of the support bracket assembly according to Embodiment 1 of the second aspect of this utility model; Figure 3 This is a schematic diagram of the support bracket assembly according to Embodiment 2 of the second aspect of this utility model; Figure 4 This is a schematic diagram showing the connection between the connecting part and the first connecting plate; Figure 5 This is a schematic diagram of the connection between the connecting part and the rotating seat.

[0016] In the diagram, 10 is a traction support device; 100 is a top beam; 200 is a base; 210 is a frame; 300 is a column; 310 is a first cylinder; 320 is a first piston rod; 400 is a traction drive component; 410 is a second cylinder; 420 is a second piston rod; 430 is a second connecting plate; 431 is a second perforation; 500 is a transmission rod; 510 is a connecting part; 511 is a first connecting plate; 512 is a pin; 513 is a first perforation; 600 is a rock-blocking plate; 700 is a first protective support; 710 is a connecting rod; 711 is a rotating seat; 712 is a third perforation; 713 is a groove; 800 is a second protective support; 810 is a T-shaped support; 811 is a vertical beam; and 812 is a horizontal beam. Detailed Implementation

[0017] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0018] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0019] In the description of this utility model, "multiple" means two or more; "greater than," "less than," and "exceeding" are understood to exclude the stated number; "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly specifying the number of indicated technical features or their sequential relationship.

[0020] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0021] Reference Figure 2 and 3 A support frame assembly according to an embodiment of the present invention includes a traction support device 10 and a first shield support 700, wherein, referring to Figure 1The traction support device 10 includes a top beam 100, a base 200, a column 300, a traction drive component 400, a transmission rod 500, and a rockfall retaining plate 600. The base 200 is used to place the device on the ground. At least two columns 300 are provided; the upper end of each column 300 is connected to the top beam 100, and the lower end is connected to the base 200. The columns 300 can extend and retract vertically. One end of the traction drive component 400 is connected to the front end of the base 200. The transmission rod 500... Along its length, the transmission rod 500 is provided with multiple connecting parts 510 for transition and engagement, one of which is connected to the end of the traction drive member 400 away from the base 200; multiple baffle plates 600 are provided, and the baffle plates 600 are fixedly connected to the top beam 100, one of which is fixed to the end of the top beam 100 away from the traction drive member 400, and the remaining baffle plates 600 are provided on both sides or one side of the top beam 100.

[0022] In actual use, the base 200 is placed stably on the channel ground, and the column 300 extends and retracts vertically according to the height of the channel, driving the top beam 100 to rise and fall until it is in contact with the top surface of the channel, so as to provide stable support for the top surface of the channel; multiple baffle plates 600 are fixed with the position of the top beam 100. The baffle plate 600 at the end of the top beam 100 away from the traction drive 400 prevents the bottom of the channel from falling with waste rock, and the baffle plates 600 on both sides (or one side) of the top beam 100 prevent the channel from falling with waste rock laterally, so as to prevent the channel from collapsing; the traction drive 400, through its own extension and retraction, drives the connected transmission rod 500 to move along the length of the channel, so as to drive the connected first protective support 700 or second protective support 800 to retract.

[0023] Furthermore, referring to Figure 2 and Figure 3 The first protective support 700 is provided with a connecting rod 710, which can extend and retract along the extension and retraction direction of the traction drive 400. One end of the connecting rod 710 is rotatably connected to the first protective support 700, and the other end is rotatably connected to the connecting part 510, so that the connecting rod 710 can swing in the vertical plane. The traction support device 10 is located on both sides or one side of the first protective support 700, and the retaining plate 600 on one side of the traction support device 10 is attached to the inner side of the channel.

[0024] It should be emphasized that the first shield support 700 with connecting rod 710 is a conventional technical device in this field, used to support the passage of the fully mechanized mining face. The height of the first shield support 700 can be adjusted by raising and lowering it, and it is used to support the top of the passage or to release the clamping state to facilitate the retrieval of the first shield support 700. The connecting rod 710 is used to control the movement of the first shield support 700 for installation or retrieval. Specifically, the connecting rod 710 and the first shield support 700 are rotatably connected, the purpose of which is to avoid mechanical interference between the connecting rod 710 and the first shield support 700 by swinging.

[0025] Reference Figure 2 In the first embodiment of the support frame assembly of this utility model, the entire support frame assembly includes two first shield supports 700 and a traction support device 10. In the initial state (the support frame assembly all abuts against the top surface of the channel to support the channel), in actual use, it has the following steps: Step 1: One of the first protective supports 700 descends and detaches from the top of the channel, the traction drive 400 extends, and the connecting rod 710 of the other first protective support 700 extends, driving the first protective support 700 to the front end through the transmission component. Step 2: The first protective support bracket 700, which has been pushed to the very front, rises and presses against the top of the passage; Step 3: Another first cover bracket 700 descends and disengages from the top of the passage. The connecting rod 710 of the first cover bracket 700 retracts, pushing the first cover bracket 700 to the foremost position. Step 4: The first protective support bracket 700, which was pushed to the front in Step 3, rises and presses against the top of the passage; Step 5: The column 300 drives the top beam 100 to descend, the traction drive component 400 retracts, and the traction support device 10 is retrieved for the next use.

[0026] In Embodiment 1, the continuity of the channel support is achieved by the alternating forward movement and tightening of the two first protective supports 700, thus preventing the channel from losing support during operation; the traction support device 10 can be recycled and reused, improving operation efficiency.

[0027] Reference Figure 3 In some embodiments, multiple first cover supports 700 are provided, and multiple first cover supports 700 are arranged side by side. A second cover support 800 is provided between two first cover supports 700. The second cover support 800 is provided with a telescopic T-shaped support 810. The T-shaped support 810 includes a vertical beam 811 and a horizontal beam 812. One end of the vertical beam 811 is rotatably connected to the front end of the second cover support 800, and the other end is fixedly connected to the middle of the horizontal beam 812. Both ends of the horizontal beam 812 can be detachably fixedly connected to the end of the transmission rod 500.

[0028] Similarly, it should be emphasized that the second protective support 800 is a conventional technical device in this field. In essence, it is the solution technology disclosed in the utility model patent with application number 202221887991.6. The second protective support 800 adjusts its height by lifting and is used to support the top of the channel or to release the tightened state so as to facilitate the retrieval of the second protective support 800.

[0029] Furthermore, multiple first protective supports 700 are installed side by side along the width of the passage, and a second protective support 800 is placed between two adjacent first protective supports 700; the vertical beam 811 of the T-shaped support can rotate with the movement of the second protective support 800 to avoid motion interference, and the horizontal beam 812 is detachably fixed to the ends of the transmission rod 500 to achieve connection or separation with the transmission rod 500; when it is necessary to move the second protective support 800, the horizontal beam 812 is fixed to the transmission rod 500, and the transmission rod 500 drives the T-shaped support, thereby pulling the second protective support 800.

[0030] Preferably, refer to Figure 3 The crossbeam 812 is provided with multiple connecting parts 510, wherein the connecting rod 710 can be rotatably connected to the connecting part 510 of the crossbeam 812 or the connecting part 510 of the transmission rod 500.

[0031] Reference Figure 3 In the second embodiment of the support frame assembly of this utility model, the entire support frame assembly includes two first shield supports 700, one second shield support 800, and a traction support device 10. In the initial state (the support frame assembly all abuts against the top surface of the channel to support the channel), in actual use, it has the following steps: Step 1: The second protective support 800 descends, the connecting rods 710 of the two first protective supports 700 extend, the traction drive 400 extends, and the second protective support 800 is pushed to the foremost position. Step 2: The second protective support bracket, pushed to the very front, rises 800 degrees and presses against the top of the passage; Step 3: One of the first protective supports 700 descends and disengages from the top of the passage. The connecting rod 710 of the first protective support 700 retracts, pushing the first protective support 700 to the foremost position. Step 4: The first protective support bracket 700, which was pushed to the front in Step 3, rises and presses against the top of the passage; Step 6: Another first cover bracket 700 descends and disengages from the top of the passage. The connecting rod 710 of the first cover bracket 700 retracts, pushing the first cover bracket 700 to the foremost position. Step 7: The first protective support bracket 700, which was pushed to the front in Step 6, rises and presses against the top of the passage; Step 8: The column 300 drives the top beam 100 to descend, the traction drive component 400 retracts, and the traction support device 10 is retrieved for the next use.

[0032] In both Embodiment 1 and Embodiment 2, the connecting rod 710 is connected to a first hydraulic cylinder (not shown in the figure) for driving the connecting rod 710 to extend and retract actively.

[0033] Compared with Embodiment 1, in Embodiment 2, the second protective support bracket 800 first seizes the front support point, and then the first protective support brackets 700 on both sides are added to form a progressive support of "middle-both sides", which enhances the stability of the channel during the withdrawal process. The T-shaped bracket 810 can be used as a length compensation for the insufficient length of the transmission rod 500, so as to achieve the purpose of connecting multiple first protective support brackets 700.

[0034] In the above-described embodiments one and two, the traction support device 10 is installed on the side of the shield support and fits against the inner wall of the channel to prevent the inner side of the channel from collapsing and improve the support effect; at the same time, the traction support device 10 replaces the original disposable "grid" structure wooden poles to reduce material consumption.

[0035] Preferably, refer to Figure 1 Each column 300 is a first hydraulic cylinder, which includes a first cylinder body 310 and a first piston rod 320. The first piston rod 320 is telescopically disposed within the first cylinder body 310, which is fixed to the base 200. The end of the first piston rod 320 is connected to the top beam 100. The first cylinder body 310 is fixed to the base 200. Injecting or discharging hydraulic oil into the first cylinder body 310 pushes the first piston rod 320 to extend or retract along the cylinder body axis, thereby causing the top beam 100 connected to it to rise or fall, achieving the contact or disengagement of the top beam 100 with the top surface of the channel.

[0036] The base 200 is fixedly connected to the frame 210, which has multiple mounting positions (not shown in the figure). Multiple uprights 300 are fixed in the mounting positions, and the uprights 300 are spaced apart. The frame 210 provides a uniform installation benchmark for the uprights 300, ensuring accurate installation positions. The spaced arrangement ensures even force distribution on the uprights 300, preventing excessive local pressure from deforming the base 200 and improving overall support stability. It should be emphasized that the mounting positions are virtual features, representing areas within the frame 210 for mounting the uprights 300. These can be recessed grooves for embedding and fixing, or areas with positioning structures, which are conventional techniques in this field and will not be described in detail here.

[0037] The frame 210 provides a unified installation benchmark for the column 300, ensuring precise installation of the column 300. The spaced arrangement ensures even force distribution on the column 300, preventing excessive local pressure from deforming the base 200 and improving overall support stability. Furthermore, the mounting position is a virtual structure; slots for embedding the column 300 can be provided in the frame 210 at the installation location, and the frame 210 and column 300 can be fixedly connected using bolts or other methods, achieving structural stability for the column 300.

[0038] Preferably, refer to Figure 2 and Figure 3 The traction drive component 400 is a second hydraulic cylinder, which includes a second cylinder body 410 and a second piston rod 420. The second piston rod 420 is telescopically disposed inside the second cylinder body 410. One end of the second cylinder body 410 away from the second piston rod 420 is rotatably connected to the end of the base 200, and the other end is rotatably connected to the transmission rod 500, so that the second hydraulic cylinder can swing in the vertical plane.

[0039] The rotating connection can prevent interference between the traction drive component 400 and the connecting part 510, avoid structural jamming, and improve the flexibility and adaptability of the traction process.

[0040] Specifically, refer to Figure 4 and Figure 5 The connecting part 510 includes two spaced-apart first connecting plates 511 and a pin 512. A first through hole 513 is provided through the center of each first connecting plate 511, and the pin 512 passes through and is rotatably connected to the first through hole 513. A second connecting plate 430 is provided at one end of the traction drive member 400 near the transmission rod 500. The second connecting plate 430 has a second through hole 431 and is embedded between the two first connecting plates 511. The second through hole 431 is connected to the first connecting plate 512. The pin 512 can be inserted into the second through hole 431 and rotatably connected to the second through hole 431, corresponding to the position of the through hole 513. The end of the connecting rod 710 is fixedly connected to a rotating seat 711, which is provided with a groove 713. The rotating seat 711 is provided with a third through hole 712, in which a first connecting plate 511 is embedded in the groove 713. The third through hole 712 corresponds to the position of the first through hole 513, and the pin 512 can be inserted into the third through hole 712 and rotatably connected to the third through hole 712.

[0041] During assembly, refer to Figure 4First, the second connecting plate 430 at the end of the traction drive component 400 is embedded between the two first connecting plates 511 of the connecting part 510. The position is adjusted so that the second through hole 431 is coaxially aligned with the first through hole 513. Then, the pin 512 is inserted into the first through hole 513 and the second through hole 431 in sequence to complete the rotational connection between the traction drive component 400 and the connecting part 510 of the transmission rod 500. Next, the rotating seat 711 at the end of the connecting rod 710 is sleeved on the outside of one of the first connecting plates 511 through the groove 713. The adjustment is made so that the third through hole 712 is coaxially aligned with the first through hole 513. The pin 512 is inserted into the third through hole 712 to realize the rotational connection between the connecting rod 710 and the connecting part 510. During operation, when the traction drive 400 extends or the connecting rod 710 moves, the pin 512 rotates synchronously in the first through hole 513, the second through hole 431, and the third through hole 712 respectively, to meet the relative rotation requirements of each component and improve the flexibility and adaptability of the traction process.

[0042] It should be mentioned that the crossbeam 812 and the transmission rod 500 are fixedly connected end to end, which can be achieved by bolt positioning, snap-fitting and other connection methods. The fixed connection method of the two long shaft parts is a conventional technical method in this field and will not be described in detail here.

[0043] Preferably, refer to Figure 2 and Figure 3 Multiple traction drive components 400 are provided, and the multiple traction drive components 400 are arranged in parallel. The multiple traction drive components 400 are installed in parallel in the same direction to ensure that the extension and retraction directions of each drive component are consistent; during operation, the multiple drive components extend and retract synchronously, and together provide traction or tension to the transmission rod 500.

[0044] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of this utility model, and these improvements and substitutions should also be considered within the protection scope of this utility model.

Claims

1. A traction-type support device, characterized in that, include: Top beam; A base for placing on the ground; The column is provided with at least two columns. The upper end of the column is connected to the top beam and the lower end is connected to the base. The column can extend and retract in the vertical direction. A traction drive unit, one end of which is connected to the front end of the base; The transmission rod has multiple connecting parts for transition and engagement along its length, one of which is connected to the end of the traction drive member away from the base. Multiple rock-blocking plates are provided, and the rock-blocking plates are fixedly connected to the top beam. One of the rock-blocking plates is fixed to the end of the top beam away from the traction drive component, and the remaining rock-blocking plates are provided on both sides or one side of the top beam. The traction drive component is telescopic to drive the transmission rod away from or towards the base.

2. The traction support device according to claim 1, characterized in that, The columns are all first hydraulic cylinders, each comprising a first cylinder body and a first piston rod. The first piston rod is telescopically mounted within the first cylinder body, the first cylinder body is fixed to the base, and the end of the first piston rod is connected to the top beam.

3. The traction support device according to claim 1, characterized in that, The base is fixedly connected to a frame, the frame is provided with multiple mounting positions, and multiple columns are fixed in the mounting positions, with the multiple columns spaced apart.

4. The traction support device according to claim 1, characterized in that, The traction drive component is a second hydraulic cylinder, which includes a second cylinder body and a second piston rod. The second piston rod is telescopically disposed in the second cylinder body. One end of the second cylinder body away from the second piston rod is rotatably connected to the end of the base, and the other end is rotatably connected to the transmission rod, so that the second hydraulic cylinder can swing in a vertical plane.

5. The traction support device according to claim 1 or 4, characterized in that, The traction drive unit is provided in multiple ways, and the multiple traction drive units are arranged in parallel.

6. A support frame assembly, characterized in that, include: The traction support device according to any one of claims 1 to 5 is provided with at least one; The first protective support is provided with a connecting rod, which can extend and retract along the extension and retraction direction of the traction drive component. One end of the connecting rod is rotatably connected to the first protective support, and the other end is rotatably connected to the connecting part, so that the connecting rod can swing in the vertical plane. The traction support device is located on both sides or one side of the first shield support, and the rock-blocking plate on one side of the traction support device is attached to the inside of the channel.

7. The support frame assembly according to claim 6, characterized in that, The connecting part includes two spaced-apart first connecting plates and a pin. The center of the first connecting plate is provided with a first through hole, and the pin passes through the first through hole and is rotatably connected to the first through hole. Wherein, the traction drive component is provided with a second connecting plate at one end near the transmission rod, the second connecting plate is provided with a second through hole, the second connecting plate is embedded between two first connecting plates, the second through hole corresponds to the position of the first through hole, the pin can be inserted into the second through hole and rotatably connected to the second through hole; The connecting rod has a rotating seat fixedly connected to its end. The rotating seat has a groove and a third through hole. One of the first connecting plates is embedded in the groove, and the third through hole corresponds to the position of the first through hole. The pin can pass through the third through hole and is rotatably connected to the third through hole.

8. The support frame assembly according to claim 6, characterized in that, Multiple first protective supports are provided, and the multiple first protective supports are arranged side by side. A second protective support is provided between two first protective supports. The second protective support is provided with a telescopic T-shaped support. The T-shaped support includes a vertical beam and a horizontal beam. One end of the vertical beam is rotatably connected to the front end of the second protective support, and the other end is fixedly connected to the middle of the horizontal beam. Both ends of the horizontal beam can be detachably fixedly connected to the end of the transmission rod.

9. The support frame assembly according to claim 8, characterized in that, The crossbeam is provided with a plurality of connecting parts, wherein the connecting rod can be rotatably connected to the connecting part of the crossbeam or the connecting part of the transmission rod.

10. The support frame assembly according to claim 6, characterized in that, The connecting rod is connected to a first hydraulic cylinder for driving the connecting rod to extend and retract actively.

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