Portable counter-force protection device

Abstract

The invention discloses a portable counter-force protection device, and relates to the technical field of building auxiliary equipment. The device comprises a bottom frame, moving wheels are rotationally installed on the four edges of the bottom frame, elastic telescopic columns are fixed to the four corners of the top of the bottom frame, an upper frame is fixed to the tops of the telescopic ends of the elastic telescopic columns, and a circular groove used for containing a crane stabilizer is formed in the top of the upper frame. Through cooperation of the moving wheels, the bottom frame, the upper frame, the elastic telescopic column and the L-shaped supporting plate, the force value sensor monitors the pressure applied to the stabilizer of the crane in real time, and meanwhile the jack, the fixing disc and the telescopic supporting column are matched to drive the fixing ring to apply reverse thrust to the stabilizer of the crane; the reverse thrust is beneficial to balancing the pressure borne by a stabilizer of the crane, and it is ensured that the crane cannot cause damage to a basement structure due to excessive bearing, especially in places such as a basement with weak bearing capacity.

Description

Technical Field

[0001] The present invention relates to the technical field of construction auxiliary equipment, in particular to a portable reaction force protection device. Background Art

[0002] Construction hoisting refers to the process of using lifting machinery to lift building materials, components, or equipment to a designated location. It's commonly used in high-rise buildings, bridges, tower cranes, and other projects to ensure the precise installation and safe transportation of large materials. During the hoisting process, the crane's stabilizers are deployed to ensure stability.

[0003] When an existing crane travels to a basement to lift heavier materials, it is subjected to a large gravity, which can easily cause the crane to crush the basement structure. Therefore, we propose a portable reaction force protection device. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the present invention provides a portable reaction force protection device, which solves the problems raised in the above background technology.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a portable reaction force protection device, including a base frame, wherein the four sides of the base frame are rotatably mounted with moving wheels, the arrangement of the moving wheels makes the base frame easy to carry and use, elastic telescopic columns are fixed at the four corners of the top of the base frame, an upper frame is fixed to the top of the telescopic end of the elastic telescopic column, a circular groove for accommodating a crane stabilizer is opened on the top of the upper frame, a force sensor is embedded in the bottom of the upper frame, the detection end of the force sensor passes through the upper frame, and the force sensor is connected to a display via a wire. And an alarm is set inside the display. The display of the force sensor is a prior art device for displaying the numerical value of the force sensor, which will not be elaborated here. The four sides of the upper frame are fixed with L-shaped support plates, the top center of the bottom frame is fixed with a jack, the top of the output end of the jack is fixed with a fixed disk, and four telescopic pillars are evenly fixed on the circumference of the top edge of the fixed disk. The four telescopic pillars all pass through the bottom of the upper frame, and a fixing ring is fixed between the tops of the four telescopic pillars, and the fixing ring is located in the circular groove of the upper frame. The fixing ring is sleeved on the detection On the outside of the end, the top horizontal plane of the detection end of the force sensor is two centimeters higher than the top horizontal plane of the fixed ring. When the crane stabilizer is deployed, the crane stabilizer falls into the circular groove of the upper frame, and the crane stabilizer contacts the detection end of the force sensor. At the same time, as the crane stabilizer moves downward, the crane stabilizer presses the upper frame downward, and the upper frame applies pressure to the telescopic end of the elastic telescopic column. The telescopic end of the elastic telescopic column contracts, and the upper frame also drives the L-shaped support plate to move downward until the L-shaped support plate contacts the ground. Then, the force sensor monitors the pressure applied by the crane stabilizer in real time, and the monitoring value of the force sensor is displayed on the force sensor display, so that the staff can observe the use of the crane in real time. When the crane lifts heavier building materials, the overall gravity of the crane increases, and the pressure applied by the crane stabilizer on the force sensor also increases. The alarm in the force sensor display will sound an alarm, and the staff will start the jack. The telescopic end of the jack drives the fixed ring upward through the fixed plate and the telescopic support. The fixed ring applies a reverse thrust to the crane stabilizer.

[0006] The L-shaped extension plate is moved in a direction away from the jack, thereby causing the L-shaped extension plate to unfold from the L-shaped support plate.

[0007] According to the above technical solution, a number of anti-skid pads are evenly and equidistantly fixed to the bottom of the L-shaped support plate. The design of the anti-skid pads can prevent the L-shaped support plate from slipping during use.

[0008] The yoke is secured to the bottom of the L-shaped support rails by means of a spring, and the yoke is secured to the bottom of the L-shaped support rails by means of a spring. The back plate pushes the L-shaped telescopic link to drive the cavity shell to move along, and the cavity shell drives the L-shaped scraper to push the gravel at the bottom of the L-shaped support plate away from the bottom of the L-shaped support plate.

[0009] The axle up and down groove at two ends embeds respectively in two guide rails up and down of being made up of the groove on the attachment piece, and the tooth on the attachment piece is meshed with tooth on upper sprocket wheel, the lower sprocket.

[0010] The present invention provides a portable reaction force protection device. It has the following beneficial effects: The present invention cooperates with the moving wheels, the base frame, the upper frame, the elastic telescopic column, and the L-shaped support plate to enable the force sensor to monitor the pressure applied to the stabilizer of the crane in real time. The monitoring value of the force sensor is displayed on the display of the force sensor, which makes it convenient for the staff to observe the use of the crane in real time. When the crane lifts heavier building materials, the jack, the fixed plate, and the telescopic support cooperate to drive the fixed ring to apply a reverse thrust to the stabilizer of the crane. This reverse thrust helps to balance the pressure on the stabilizer of the crane, ensuring that the crane does not cause damage to the basement structure due to excessive load, especially in places with weak load-bearing capacity such as basements, to avoid direct damage to the underground structure due to excessive pressure. Through this reaction force support, the safety and stability of the crane in complex environments can be effectively improved. The L-shaped support plate here can disperse the pressure on the jack and the base frame, thereby reducing the situation where the basement structure is subjected to excessive force locally, avoiding excessive pressure on a certain point or area, and thus reducing the risk of structural damage.

[0011] The present invention cooperates with the L-shaped support plate, L-shaped extension plate, L-shaped sliding rod, jack, and push rod to enable the L-shaped extension plate to be unfolded from the L-shaped support plate. After the L-shaped extension plate is unfolded, the supporting surface of the L-shaped support plate can be increased, so that the pressure distribution on the L-shaped support plate is more uniform, thereby improving the stability of the entire supporting structure, which helps to better share and transfer the load during the lifting process.

[0012] (3) The present invention provides an anti-skew device, so that the upper frame, L-shaped telescopic connecting rod, circular sleeve, cavity shell, resistance block, and hinged rod cooperate to drive the L-shaped scraper to push the gravel at the bottom of the L-shaped support plate away from the bottom of the L-shaped support plate, thereby avoiding the problem that the presence of gravel will cause uneven contact between the L-shaped support plate and the ground, affecting the stability of the L-shaped support plate.

[0013] (4) The present invention sets a positioning device so that the upper frame, screw, gear, rack plate, screw and screw block cooperate to drive the positioning plate to move toward the center of the upper frame. When the stabilizer of the crane is not in the center of the upper frame and falls, the positioning plate will abut against the outer wall of the stabilizer of the crane, thereby ensuring that the positioning plate positions the reaction force protection device in this patent, thereby ensuring that the stabilizer of the crane is in the center of the upper frame and falls. The stabilizer of the crane falls in the correct position, which can effectively increase the stability of the crane and prevent tilting or unbalanced load caused by incorrect positioning of the stabilizer. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the present invention as a whole Figure 1 ; Figure 2 This is a schematic diagram of the present invention as a whole Figure 2 ; Figure 3 It is a schematic cross-sectional view of a local structure of the present invention; Figure 4 Schematic diagram of the local structure of the present invention Figure 1 ; Figure 5 Schematic diagram of the local structure of the present invention Figure 2 ; Figure 6 is a schematic diagram of the anti-skew device of the present invention; Figure 7 The partial structure diagram of the anti-skew device of the present invention is shown in FIG. Figure 1 ; Figure 8 The partial structure diagram of the anti-skew device of the present invention is shown in FIG. Figure 2 ; Figure 9 Schematic diagram of the positioning device of the present invention Figure 1 ; Figure 10 Schematic diagram of the positioning device of the present invention Figure 2 .

[0015] In the figure: 1. Base frame; 2. Anti-skew device; 21. L-shaped telescopic connecting rod; 22. Circular sleeve; 23. Cavity shell; 24. L-shaped scraper; 25. Resistance block; 26. Elastic telescopic rod; 27. Articulated rod; 3. Positioning device; 31. Rack plate; 32. Screw; 33. Screw block; 34. Gear; 35. Push plate; 36. Positioning plate; 4. Moving wheel; 5. Elastic telescopic column; 6. Upper shelf; 7. Force sensor; 8. L-shaped support plate; 9. Jack; 10. Fixed plate; 11. Telescopic pillar; 12. Fixed ring; 13. Push rod; 14. L-shaped slide bar; 15. L-shaped extension plate. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0017] See also Figures 1-10One embodiment of the present invention is: a portable reaction force protection device, including a base frame 1, the four sides of the base frame 1 are rotatably mounted with moving wheels 4, the arrangement of the moving wheels 4 makes the base frame 1 easy to carry and use, elastic telescopic columns 5 are fixed at the four corners of the top of the base frame 1, the top of the telescopic end of the elastic telescopic column 5 is fixed with an upper frame 6, the top of the upper frame 6 is provided with a circular groove for accommodating a crane stabilizer, the bottom of the upper frame 6 is embedded with a force sensor 7, the detection end of the force sensor 7 passes through the upper frame 6, the force sensor 7 is connected to a display through a wire, and an alarm is provided inside the display, and the force value The display of the sensor 7 is a prior art device for displaying the numerical value of the force sensor 7, which will not be elaborated here. L-shaped support plates 8 are fixed to the four sides of the upper frame 6, a jack 9 is fixed to the top center of the bottom frame 1, a fixed disk 10 is fixed to the top of the output end of the jack 9, and four telescopic pillars 11 are evenly fixed on the circumference of the top edge of the fixed disk 10. The four telescopic pillars 11 all pass through the bottom of the upper frame 6, and a fixing ring 12 is fixed between the tops of the four telescopic pillars 11, and the fixing ring 12 is located in the circular groove of the upper frame 6. The fixing ring 12 is sleeved on the outside of the detection end of the force sensor 7, and the force sensor The top horizontal plane of the detection end of the sensor 7 is two centimeters higher than the top horizontal plane of the fixing ring 12. Through the arrangement of the above structure, the force sensor 7 can monitor the pressure applied to the stabilizer of the crane in real time. The monitoring value of the force sensor 7 is displayed on the display of the force sensor 7, so that the staff can observe the use of the crane in real time. When the crane lifts heavier building materials, through the arrangement of the above structure, the telescopic end of the jack 9 drives the fixing ring 12 to move upward through the fixing plate 10 and the telescopic support 11. The fixing ring 12 applies a reverse thrust to the stabilizer of the crane. This reverse thrust helps to balance the pressure on the stabilizer of the crane, ensuring that the crane does not cause damage to the basement structure due to excessive load, especially in places with weak load-bearing capacity such as basements, to avoid direct damage to the underground structure due to excessive pressure. Through this counter-force support, the safety and stability of the crane in complex environments can be effectively improved. The L-shaped support plate 8 here can disperse the pressure on the jack 9 and the base frame 1, thereby reducing the situation where the basement structure is subjected to excessive force locally, avoiding excessive pressure on a certain point or area, and thus reducing the risk of structural damage.

[0018] The L-shaped support plate 8 is provided with an open groove on one side close to the upper frame 6, and L-shaped extension plates 15 are installed in the open grooves of the four L-shaped support plates 8 for horizontal sliding. L-shaped sliding rods 14 are installed in a sliding manner on the four sides of the top of the bottom frame 1, and the outer wall of the L-shaped sliding rod 14 is slidably connected to the outer wall of the L-shaped extension plate 15. The side of the L-shaped sliding rod 14 away from the L-shaped extension plate 15 is hingedly connected to the outer wall of the output end of the jack 9 by a push rod 13. Through the setting of the above structure, the L-shaped sliding rod 14 pushes the L-shaped extension plate 15 to move in the direction away from the jack 9, so that the L-shaped extension plate 15 is unfolded from the L-shaped support plate 8. After the L-shaped extension plate 15 is unfolded, the supporting surface of the L-shaped support plate 8 can be increased, so that the pressure distribution on the L-shaped support plate 8 is more uniform, thereby improving the stability of the entire supporting structure, which helps to better share and transfer the load during the lifting process.

[0019] A number of anti-skid pads are evenly and equidistantly fixed to the bottom of the L-shaped support plate 8. The design of the anti-skid pads can prevent the L-shaped support plate 8 from slipping during use.

[0020] An anti-skew device 2 is provided at the L-shaped support plate 8, and the anti-skew device 2 includes eight L-shaped telescopic links 21 and eight elastic telescopic rods 26. The eight L-shaped telescopic links 21 are respectively slidably mounted on the four sides of the bottom of the upper frame 6, and a cavity shell 23 is fixed on the side close to each other at the bottom of two adjacent L-shaped telescopic links 21. An L-shaped scraper 24 is slidably mounted inside the cavity shell 23, and a spring is provided between the L-shaped scraper 24 and the inner wall of the cavity shell 23. A circular sleeve 22 is sleeved on the lower outer wall of the eight L-shaped telescopic links 21, and the circular sleeve 22 is slidably mounted on the top of the base frame 1. The fixed ends of the eight telescopic elastic telescopic rods 26 are respectively fixed at the four sides of the top of the base frame 1, and the adjacent two telescopic elastic telescopic rods 26 are fixed. A resistance block 25 is fixed between the tops, and the bottom of the resistance block 25 is hingedly connected to the outer wall of the circular sleeve 22 by a hinge rod 27. There is a ten-centimeter gap between the bottom of the L-shaped scraper 24 and the bottom horizontal plane of the moving wheel 4, and a ten-centimeter gap between the top of the resistance block 25 and the bottom of the upper frame 6. The cavity shell 23 is located at the bottom of the L-shaped support plate 8, and the sides of the two adjacent L-shaped scrapers 24 that are close to each other are fitted together. Through the arrangement of the above structure, the cavity shell 23 drives the L-shaped scraper 24 to push the gravel at the bottom of the L-shaped support plate 8 away from the bottom of the L-shaped support plate 8, thereby avoiding the problem that the presence of gravel will cause uneven contact between the L-shaped support plate 8 and the ground, affecting the stability of the L-shaped support plate 8.

[0021] When in use, the base frame 1 is moved to the stabilizer support position of the crane by the moving wheels 4. The setting of the moving wheels 4 makes the base frame 1 easy to carry and use. When the stabilizer of the crane is unfolded, the stabilizer of the crane falls into the circular groove of the upper frame 6, and the stabilizer of the crane contacts the detection end of the force sensor 7. At the same time, as the stabilizer of the crane moves downward, the stabilizer of the crane will press the upper frame 6 to move downward, and the upper frame 6 will apply pressure to the telescopic end of the elastic telescopic column 5. The telescopic end of the elastic telescopic column 5 contracts, and the upper frame 6 will also drive the L-shaped support plate 8 to move downward until the L-shaped support plate 8 contacts the ground. Then, the force sensor 7 will monitor the pressure applied by the stabilizer of the crane in real time, and the monitoring value of the force sensor 7 will be displayed on the display of the force sensor 7, so that the staff can observe the use of the crane in real time. When the crane lifts heavier building materials, the overall gravity of the crane The L-shaped support plate 8 here can disperse the pressure on the jack 9 and the base frame 1, thereby reducing the local excessive force on the basement structure and avoiding excessive pressure on a certain point or area, thereby reducing the risk of structural damage.

[0022] It should be noted that each time the stabilizer of the crane presses the upper frame 6 to move downward, the stabilizer of the crane also presses the fixing ring 12 to drive the telescopic end of the telescopic support 11 to retract.

[0023] When the L-shaped support plate 8 moves downward, the L-shaped support plate 8 drives the L-shaped extension plate 15 to move downward, and the L-shaped extension plate 15 moves downward along the outside of the L-shaped slide bar 14. Each time the telescopic end of the jack 9 moves upward, the telescopic end of the jack 9 pushes the push rod 13 to drive the L-shaped slide bar 14 to move away from the jack 9, and the L-shaped slide bar 14 pushes the L-shaped extension plate 15 to move away from the jack 9, so that the L-shaped extension plate 15 is unfolded from the L-shaped support plate 8. After the L-shaped extension plate 15 is unfolded, the supporting surface of the L-shaped support plate 8 can be increased, so that the pressure distribution on the L-shaped support plate 8 is more uniform, thereby improving the stability of the entire supporting structure, which helps to better share and transfer the load during the lifting process.

[0024] When the upper frame 6 moves downward, it will also push the L-shaped telescopic connecting rod 21 to move downward along the inside of the circular sleeve 22. The L-shaped telescopic connecting rod 21 drives the L-shaped scraper 24 to contact the ground through the cavity shell 23. At the same time, the upper frame 6 will contact the top of the resistance block 25. As the upper frame 6 continues to move downward, the upper frame 6 pushes the resistance block 25 to move downward. The resistance block 25 pushes the hinged rod 27 to drive the circular sleeve 22 to move away from the L-shaped support plate 8. The circular sleeve 22 pushes the L-shaped telescopic connecting rod 21 to drive the cavity shell 23 to move accordingly. The cavity shell 23 drives the L-shaped scraper 24 to push the gravel at the bottom of the L-shaped support plate 8 away from the bottom of the L-shaped support plate 8, thereby avoiding the problem that the presence of gravel will cause uneven contact between the L-shaped support plate 8 and the ground, affecting the stability of the L-shaped support plate 8.

[0025] It should be noted that when the cavity shell 23 drives the L-shaped scraper 24 to move, the L-shaped support plate 8 will push the cavity shell 23 to squeeze the L-shaped scraper 24. At this time, the L-shaped scraper 24 will slowly retract into the interior of the cavity shell 23, and the cavity shell 23 will pull the telescopic end of the L-shaped telescopic link 21 to stretch during this process. This design ensures that the existence of the cavity shell 23 and the L-shaped scraper 24 will not interfere with the supporting operation of the L-shaped support plate 8.

[0026] See also Figures 1-10 On the basis of the above embodiment, in another embodiment of the present invention, a positioning device 3 is provided at the upper frame 6, and the positioning device 3 includes four rack plates 31 and four screws 32. The four rack plates 31 are respectively fixed at the outer walls of the four corners of the bottom frame 1, and the four screws 32 are respectively rotatably installed at the bottom of the four corners of the upper frame 6 through the bracket. A gear 34 is fixed at one end of the screw 32 away from the upper frame 6, and the gear 34 is engaged with the rack plate 31. The external thread of the screw 32 is connected to a screw block 33, and a push plate 35 is fixed to the bottom of the screw block 33. The top of the upper frame 6 is provided with a push plate 35 sliding slide, a positioning plate 36 is fixed to one end of the push plate 35 close to the center of the upper frame 6. Through the arrangement of the above structure, when the stabilizer of the crane is not in the center position of the upper frame 6 and falls, the positioning plate 36 will be against the outer wall of the stabilizer of the crane, thereby ensuring that the positioning plate 36 positions the reaction force protection device in this patent, thereby ensuring that the stabilizer of the crane is in the center position of the upper frame 6 and falls. The stabilizer of the crane falls in the correct position, which can effectively increase the stability of the crane and prevent tilting or unbalanced load caused by incorrect positioning of the stabilizer.

[0027] During use, when the upper frame 6 moves downward, the upper frame 6 drives the gear 34 to move downward through the screw 32, the rack plate 31 drives the screw 32 to rotate through the gear 34, and the screw 32 drives the screw block 33 to drive the positioning plate 36 to move toward the center of the upper frame 6. When the stabilizer of the crane is not in the center position of the upper frame 6 and falls, the positioning plate 36 will be against the outer wall of the stabilizer of the crane, thereby ensuring that the positioning plate 36 positions the reaction force protection device in this patent, thereby ensuring that the stabilizer of the crane is in the center position of the upper frame 6 and falls. The stabilizer of the crane falls in the correct position, which can effectively increase the stability of the crane and prevent tilting or unbalanced load caused by incorrect positioning of the stabilizer.

[0028] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A portable reaction force protection device, comprising a base frame (1), characterized in that: The four sides of the base frame (1) are all rotatably mounted with moving wheels (4), the four corners of the top of the base frame (1) are all fixed with elastic telescopic columns (5), the top of the telescopic end of the elastic telescopic column (5) is fixed with an upper frame (6), the top of the upper frame (6) is provided with a circular groove for accommodating a crane stabilizer, the bottom of the upper frame (6) is embedded with a force value sensor (7), the four sides of the upper frame (6) are all fixed with L-shaped support plates (8), the top center of the base frame (1) is fixed with a jack (9), the top of the output end of the jack (9) is fixed with a fixed disk (10), and four telescopic pillars (11) are evenly fixed on the circumference of the top edge of the fixed disk (10), the four telescopic pillars (11) all pass through the bottom of the upper frame (6), a fixing ring (12) is fixed between the tops of the four telescopic pillars (11), and the fixing ring (12) is located in the circular groove of the upper frame (6).

2. A portable reaction force protection device according to claim 1, characterized in that: The detection end of the force sensor (7) passes through the upper frame (6), and the force sensor (7) is connected to a display via a wire, and an alarm is provided inside the display.

3. A portable reaction force protection device according to claim 2, characterized in that: The fixing ring (12) is sleeved on the outside of the detection end of the force sensor (7), and the top horizontal plane of the detection end of the force sensor (7) is two centimeters higher than the top horizontal plane of the fixing ring (12).

4. The portable reaction force protection device according to claim 1, characterized in that: An open slot is provided on one side of the L-shaped support plate (8) close to the upper frame (6).

5. A portable reaction force protection device according to claim 4, characterized in that: L-shaped extension plates (15) are installed in the open grooves of the four L-shaped support plates (8) for transverse sliding. L-shaped slide bars (14) are installed on the four sides of the top of the base frame (1) for sliding. The outer wall of the L-shaped slide bar (14) is slidably connected to the outer wall of the L-shaped extension plate (15). The side of the L-shaped slide bar (14) away from the L-shaped extension plate (15) is hingedly connected to the outer wall of the output end of the jack (9) through a push rod (13).

6. The portable reaction force protection device according to claim 1, characterized in that: Several anti-slip pads are evenly and equidistantly fixed to the bottom of the L-shaped support plate (8).

7. The portable reaction force protection device according to claim 1, characterized in that: The L-shaped support plate (8) is provided with an anti-skew device (2), and the anti-skew device (2) comprises eight L-shaped telescopic links (21) and eight elastic telescopic rods (26). The eight L-shaped telescopic links (21) are respectively slidably mounted on the four sides of the bottom of the upper frame (6). A cavity shell (23) is fixed on the side close to each other at the bottom of two adjacent L-shaped telescopic links (21). An L-shaped scraper (24) is slidably mounted inside the cavity shell (23), and the L-shaped scraper (24) is in contact with the cavity shell ( A spring is provided between the inner walls of the eight L-shaped telescopic connecting rods (21), a circular sleeve (22) is sleeved on the lower outer walls of the eight L-shaped telescopic connecting rods (21), and the circular sleeve (22) is slidably installed on the top of the base frame (1), and the fixed ends of the eight telescopic elastic telescopic rods (26) are respectively fixed at the four sides of the top of the base frame (1), and a resistance block (25) is fixed between the tops of two adjacent telescopic elastic telescopic rods (26), and the bottom of the resistance block (25) is hingedly connected to the outer wall of the circular sleeve (22) through a hinge rod (27).

8. The portable reaction force protection device according to claim 7, characterized in that: There is a distance of ten centimeters between the bottom of the L-shaped scraper (24) and the bottom horizontal plane of the moving wheel (4), and there is a distance of ten centimeters between the top of the abutment block (25) and the bottom of the upper rack (6).

9. The portable reaction force protection device according to claim 7, characterized in that: The cavity shell (23) is located at the bottom of the L-shaped support plate (8), and the sides of two adjacent L-shaped scrapers (24) that are close to each other are in contact with each other.

10. The portable reaction force protection device according to claim 9, characterized in that: The upper frame (6) is provided with a positioning device (3), and the positioning device (3) includes four rack plates (31) and four screw rods (32). The four rack plates (31) are respectively fixed to the outer walls of the four corners of the bottom frame (1). The four screw rods (32) are respectively rotatably installed at the bottom of the four corners of the upper frame (6) through brackets. A gear (34) is fixed to the end of the screw rod (32) away from the upper frame (6). The gear (34) is engaged with the rack plate (31). The external thread of the screw rod (32) is connected to a screw block (33). A push plate (35) is fixed to the bottom of the screw block (33). A sliding groove for the push plate (35) to slide is provided on the top of the upper frame (6). A positioning plate (36) is fixed to the end of the push plate (35) close to the center of the upper frame (6).

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