Electronic head protector for taekwondo

Abstract

The application relates to the technical field of sports protective equipment, and discloses a buffering electronic head protector for taekwondo, which comprises a head protector main body, a buffering protection assembly and a sensing system, the head protector main body comprises a head protection part and a back brain protection part, an adjusting gap is formed in the bottom of the back brain protection part, adjusting belts are connected to the two sides of the adjusting gap, a drag tongue is arranged in the middle of the adjusting gap, the drag tongue is perpendicular to the length direction of the adjusting belt, the end of the drag tongue is integrally formed with the head protector main body, and the drag tongue is located on the side of the adjusting belt which faces the inside of the head protector main body. The application has the effect of improving the comfort of the wearer.

Description

Technical Field

[0001] This application relates to the field of sports protective equipment technology, and in particular to a cushioned electronic headgear for Taekwondo. Background Technology

[0002] In Taekwondo, the head is a crucial area for both attack and defense, and head protection is typically worn to safeguard athletes' heads. With advancements in technology, electronic head protection has become increasingly prevalent in Taekwondo competitions and training. These head protection devices use electronic sensors to detect the force of strikes, aiding referees in their judgments. However, existing electronic head protectors for taekwondo have certain shortcomings in terms of cushioning and protection. On the one hand, the cushioning structure design is not reasonable enough, and the protection for the head is not comprehensive enough. When subjected to a strong blow, it can easily cause injury to the athlete's head. On the other hand, the cushioning layer has poor cushioning effect and cannot effectively absorb and disperse the impact force, affecting the athlete's wearing experience and safety.

[0003] Chinese Patent No. CN217119300U discloses an electronic headgear for Taekwondo, which includes a headgear body and a sensing system. The headgear body includes a first buffer layer, a second buffer layer and a third buffer layer from the inside out. The sensing system includes a force sensing component and a magnetic sensing component. The force sensing component is disposed between the first buffer layer and the second buffer layer, and the magnetic sensing component is disposed between the second buffer layer and the third buffer layer.

[0004] The aforementioned electronic headgear for Taekwondo, when adapted to different users, primarily relies on adjustable straps connected to both sides of the chin for a secure fit. However, in actual use, these adjustable straps have significant drawbacks: to ensure the headgear doesn't slip off during exercise, the straps often need to be tightened, which can create a strong constricting sensation on the wearer's chin. This not only causes localized pressure and affects blood circulation but also causes persistent discomfort during training or competition, potentially leading to distraction and negatively impacting athletic performance. Utility Model Content

[0005] To improve wearer comfort, this application provides a cushioned electronic headgear for Taekwondo.

[0006] The technical solution for a cushioned electronic headgear used in Taekwondo provided in this application is as follows: A cushioned electronic headgear for Taekwondo includes a headgear body, a cushioning and protective component, and a sensing system. The headgear body includes a head protection section and a back head protection section. An adjustment notch is provided at the bottom of the back head protection section. Adjustment straps are connected to both sides of the adjustment notch. A trailing tongue is provided in the middle of the adjustment notch. The trailing tongue is perpendicular to the length direction of the adjustment straps, and its end is integrally formed with the headgear body. The trailing tongue is located on the side of the adjustment straps facing the inside of the headgear body.

[0007] By adopting the above technical solution, an adjustment notch and adjustment strap are set in the back head protection section of the headgear, allowing for adjustment of the tightness of the headgear according to different people, making it convenient to wear for people with different head circumferences. At the same time, the tongue is located on the side of the adjustment strap facing inwards from the headgear, which can support and cushion the adjustment strap, preventing the adjustment strap from directly constricting the wearer's head, reducing local pressure on the back of the head, promoting blood circulation, and significantly improving the wearer's comfort during training or competition, allowing the wearer to focus more on the sport.

[0008] Optionally, the adjustment band is made of elastic webbing material, with one end fixed to the outer wall of the back of the head protection part and the other end provided with a first Velcro. A first adhesive area adapted to the first Velcro is provided at a corresponding position on the back of the head protection part.

[0009] By adopting the above technical solution, the adjustment band is made of elastic webbing material, which can provide a certain degree of elasticity, relieve the tightness of the adjustment band on the wearer, and improve wearing comfort; the adjustment band is connected and fastened by the first Velcro and the first adhesive area, which makes it convenient to adjust the tightness of the headgear to suit different people.

[0010] Optionally, the head protector body also includes a cheek protection part, which is arc-shaped and conforms to the contour of the cheek, with its edges smoothly transitioning to the head protection part.

[0011] By adopting the above technical solution, the cheek protection part fits the contour of the cheek and transitions smoothly with the head protection part, which enhances the fit between the head protection body and the face, improves the integrity of the overall protection, makes up for the blind spots of face protection in traditional electronic head protection for Taekwondo, and improves the protection effect on the cheek area.

[0012] Optionally, the head protector body is provided with several ventilation holes.

[0013] By adopting the above technical solution, the design of several ventilation holes can enhance air circulation inside the headgear body, reduce stuffiness, and improve the wearer's comfort experience.

[0014] Optionally, the buffer protection component is located in the inner layer of the head protector body. The buffer protection component includes a first buffer layer, a second buffer layer, and a third buffer layer from the inside out. The sensing system includes a piezoelectric coil, a magnetic coil, and a signal processor with an integrated Bluetooth transmission module. The piezoelectric coil is disposed between the first and second buffer layers, and the magnetic coil is disposed between the second and third buffer layers. A placement groove is recessed at the top of the head protection part, and the signal processor is disposed in the placement groove. The signal connection ends of the piezoelectric coil and the magnetic coil converge in the placement groove and are electrically connected to the signal processor.

[0015] By employing the above technical solution, the third buffer layer contacts the external impact, and after buffering, transmits the entire pressure to the magnetic coil and the second buffer layer; the magnetic coil detects the magnetic signal generated by the magnetic foot protector on the hand; the second buffer layer conducts the impact, transmitting the pressure to the piezoelectric coil; the piezoelectric coil detects the external impact pressure; the first buffer layer protects the user's head on the innermost side. The magnetic coil transmits the sensed magnetic signal to the signal processor, which converts and identifies whether the foot protector has struck the head protector; the piezoelectric coil transmits the tiny electrical signal generated by the sensed pressure to the signal processor, which amplifies, filters, compares, integrates, and identifies whether the impact is effective through the force signal detection module; the signal processor transmits the judgment result externally via the Bluetooth transmission module.

[0016] Optionally, the piezoelectric coil and the magnetic coil are arranged in several turns along the circumference of the head protector body. Each turn of the piezoelectric coil has a corrugated pattern, and each turn of the magnetic coil has a straight pattern.

[0017] By adopting the above technical solution, the piezoelectric coil has several turns around the circumference of the head protector body and is arranged in a corrugated pattern. This wiring method ensures that any impact point can be effectively detected, improving the accuracy of force sensing. Each turn of the magnetic coil has several turns around the circumference of the head protector body and is arranged in a straight line. The straight line arrangement expands the magnetic signal detection range and, together with the force sensing component, enables accurate identification of the impact source.

[0018] Optionally, the head protection part is provided with a cover covering the placement groove. One side of the cover is fixed to the head protection part. A second Velcro is provided around the outer edge of the placement groove on the side of the cover facing the placement groove. A second adhesive area adapted to the second Velcro is provided at a corresponding position on the head protection part.

[0019] By adopting the above technical solution, the signal processor placed in the slot can be effectively protected from external impacts, dust and sweat. The cover is easy to open and close with Velcro, which facilitates the inspection and maintenance of the signal processor.

[0020] Optionally, the adjusting belt includes a mounting plate, a bobbin, a drive cap, and an adjusting rope. The mounting plate is mounted on the drag tongue, the bobbin is rotatably connected to the mounting plate, the drive cap is coaxially sleeved on the bobbin, the inner ring sidewall of the drive cap is provided with several insertion blocks, the outer ring sidewall of the bobbin is provided with several insertion slots that engage with the insertion blocks, the inner cylinder wall of the bobbin is provided with an elastic limiting ring, and a drive rod is coaxially mounted on the inner sidewall of the drive cap. A limiting plate is fitted on the moving rod and slides against the inner wall of the I-beam wheel. A ratchet is coaxially fitted at the end of the driving rod. A pawl is rotatably mounted on the inner wall of the mounting plate. The pawl is located on one side of the ratchet. When the tip of the pawl is inserted between the ratchet teeth and rotates with the ratchet, the limiting plate is limited between the elastic limiting ring and the mounting plate. An adjusting rope is provided on each side of the drag tongue. One end of the adjusting rope is fixed to the back of the head protection part, and the other end is fixed to the I-beam wheel.

[0021] By adopting the above technical solution, when the head protector needs to be tightened, rotating the drive cap causes the insertion block and slot to engage, driving the I-beam wheel to rotate. The head protector is then tightened via the adjusting rope, and a ratchet and pawl mechanism locks it in place to prevent the rope from retracting. When the head protector needs to be loosened, pulling out the drive cap disengages it from the elastic limit ring, separating the ratchet and pawl, allowing the I-beam wheel to rotate freely and loosen the rope. After adjustment, the cap is pushed back to relock. This not only achieves stepless adjustment of the head protector's tightness but also ensures stability through mechanical self-locking, combining ease of operation with reliable fixation when adapting to different head circumferences.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. An adjustment notch and adjustment strap are provided in the back of the head protection section of the headgear, allowing for adjustment of the tightness to suit different head sizes. Simultaneously, the drawstring is positioned on the side of the adjustment strap facing inwards from the head protection, providing support and cushioning to prevent the strap from directly constricting the back of the head, reducing localized pressure, promoting blood circulation, and significantly improving comfort during training or competition, allowing the wearer to focus more on the activity. 2. The adjustment strap is made of elastic webbing material, which can provide a certain degree of elasticity, relieve the tightness of the adjustment strap on the wearer, and improve wearing comfort; the adjustment strap is connected and fastened using the first Velcro and the first adhesive area, which makes it easy to adjust the tightness of the headgear to fit different people; 3. The cheek protection conforms to the contours of the cheeks and transitions smoothly with the head protection, enhancing the fit between the headgear and the face, improving the overall integrity of the protection, filling the blind spots in the face protection of traditional electronic headgear used in Taekwondo, and improving the protection effect on the cheek area. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application.

[0024] Figure 2 This is a schematic diagram illustrating the positional relationship between the back of the head protection unit, the tongue, and the adjustment mechanism in Embodiment 1 of this application.

[0025] Figure 3 This is a cross-sectional view illustrating the positional relationship between the first buffer layer, the second buffer layer, and the third buffer layer in Embodiment 1 of this application.

[0026] Figure 4 This is a schematic diagram illustrating the positional relationship between the back of the head protection unit, the tongue, and the adjustment mechanism in Embodiment 2 of this application.

[0027] Figure 5 This is a cross-sectional view illustrating the connection relationship between the mounting plate, the I-beam wheel, the drive cap, and the adjusting rope in Embodiment 2 of this application.

[0028] Explanation of reference numerals in the attached figures: 1. Headgear body; 11. Head protection section; 111. Placement slot; 112. Cover; 1121. Second Velcro; 113. Second adhesive area; 12. Back of head protection section; 121. Adjustment notch; 122. Tongue; 123. First adhesive area; 13. Cheek protection section; 2. Buffer protection assembly; 21. First buffer layer; 22. Second buffer layer; 23. Third buffer layer; 3. Sensing system; 31. Piezoelectric coil; 32. Magnetic coil; 33. Signal processor; 4. Adjustment strap; 41. First Velcro; 5. Vent hole; 6. Mounting plate; 61. Pawl; 7. H-beam wheel; 71. Insertion slot; 72. Elastic limit ring; 8. Drive cap; 81. Insertion block; 82. Drive rod; 821. Limiting plate; 822. Ratchet; 9. Adjustment rope. Detailed Implementation

[0029] The following is in conjunction with the appendix Figures 1-5 This application will be described in further detail.

[0030] This application discloses a cushioned electronic headgear for Taekwondo.

[0031] Example 1 Reference Figure 1 , Figure 2 and Figure 3 A cushioned electronic headgear for Taekwondo includes a headgear body 1, a cushioning protection component 2, and a sensing system 3. The headgear body 1 is used to directly contact the head and provide basic protection, while the cushioning protection component 2 enhances the cushioning performance of the headgear. The sensing system 3 can detect the impact force. The three work together to ensure the safety of the athlete's head when it is hit, and can accurately detect the impact force to provide a basis for the referee's judgment.

[0032] Reference Figure 1 and Figure 2 The head protector body 1 includes a head protection section 11, a back head protection section 12, and cheek protection sections 13. The head protection section 11 mainly protects the front and top of the head, and its shape conforms to the contours of the sides and top of the head. The cheek protection section 13 is arc-shaped and conforms to the contours of the cheeks, with its edges smoothly transitioning to the head protection section 11. The back head protection section 12 protects the back of the head area, and its shape conforms to the arc surface of the back of the head.

[0033] Reference Figure 2 The back of the head protection section 12 has an adjustment notch 121 at its bottom. Adjustment straps 4 are connected to both sides of the adjustment notch 121, and a tab 122 is located in the middle of the adjustment notch 121. The tab 122 is perpendicular to the length of the adjustment straps 4, and its end is integrally formed with the head protection body 1. The tab 122 is located on the side of the adjustment straps 4 facing inwards from the head protection body 1. This design allows the tab 122 to provide some support and cushioning when adjusting the tightness of the head protection, reducing direct pressure on the head from the adjustment straps 4. Furthermore, the head protection body 1 has several ventilation holes 5. The presence of ventilation holes 5 allows the head to be ventilated when wearing the head protection, reducing stuffiness and sweat accumulation, and improving wearing comfort. In this embodiment, the ventilation holes 5 are round, square, or triangular to achieve both breathability and aesthetics.

[0034] Reference Figure 2 In this embodiment, the adjustment band 4 is made of elastic webbing material. This elastic material has a certain degree of elasticity, which can reduce the feeling of tightness on the head while ensuring the head protector is secure. One end is fixed to the outer wall of the back head protection part 12, and the other end is sewn with a first Velcro 41. A first adhesive area 123, adapted to the first Velcro 41, is sewn onto the corresponding position of the outer wall of the back head protection part 12. The tightness of the head protector can be easily adjusted through the adhesive cooperation of the first Velcro 41 and the first adhesive area 123.

[0035] Reference Figure 1 and Figure 3 The buffer protection component 2 is located inside the head protector body 1. The buffer protection component 2 includes, from the inside out, a first buffer layer 21, a second buffer layer 22, and a third buffer layer 23. The first buffer layer 21 can initially absorb and disperse the impact force, reducing the direct impact on the head; the second buffer layer 22 can further enhance the buffering effect and absorb the remaining impact force; the third buffer layer 23 can withstand greater external impact.

[0036] Reference Figure 1 and Figure 3The sensing system 3 includes a piezoelectric coil 31, a magnetic induction coil 32, and a signal processor 33 integrating a Bluetooth transmission module. The piezoelectric coil 31 is positioned between the first buffer layer 21 and the second buffer layer 22, while the magnetic induction coil 32 is positioned between the second buffer layer 22 and the third buffer layer 23. Both the piezoelectric coil 31 and the magnetic induction coil 32 have several turns around the circumference of the head protector body 1. Each turn of the piezoelectric coil 31 has a corrugated pattern, which allows for more sensitive detection of pressure changes in different directions. Each turn of the magnetic induction coil 32 has a straight pattern, which allows for more accurate detection of magnetic field changes. This arrangement makes signal transmission more convenient and stable.

[0037] Reference Figure 1 The head protection part 11 has a recessed placement groove 111 at the top of the head. The signal processor 33 is located in the placement groove 111. The signal connection ends of the piezoelectric coil 31 and the magnetic induction coil 32 are all converged in the placement groove 111 and electrically connected to the signal processor 33.

[0038] Reference Figure 1 When the head guard is struck, the piezoelectric coil 31 will generate an electrical signal due to the pressure, and the magnetic coil 32 will generate an electrical signal due to the change in the magnetic field. The signal processor 33 can process and analyze these electrical signals.

[0039] Reference Figure 1 The head protection part 11 is provided with a cover 112 covering the placement slot 111. One side of the cover 112 is fixed to the outer wall of the head protection part 11. Four second Velcro straps 1121 are sewn around the outer edge of the placement slot 111 on the side of the cover 112 facing the placement slot 111. Second adhesive areas 113 adapted to the second Velcro straps 1121 are sewn on the corresponding positions of the outer wall of the head protection part 11. The function of the cover 112 is to protect the signal processor 33 inside the placement slot 111 from external impacts and dust contamination. Through the cooperation of the second Velcro straps 1121 and the second adhesive areas 113, the cover 112 can be easily opened and closed, facilitating the inspection and maintenance of the signal processor 33. The implementation principle of a cushioned electronic headgear for Taekwondo, as described in this application, is as follows: This cushioned electronic headgear for Taekwondo effectively absorbs and disperses impact force through a multi-layered cushioning system, reducing injury to the athlete's head; the head protection section 11, cheek protection section 13, and back head protection section 12 provide comprehensive head protection; the adjustable strap 4, using elastic webbing and Velcro, allows for easy adjustment of the headgear's tightness, reducing constriction on the chin and improving wearing comfort. Compared with existing technologies, it solves the problems of insufficient cushioning protection and poor wearing comfort, providing Taekwondo athletes with safer and more comfortable headgear.

[0040] Example 2 Reference Figure 4 and Figure 5 The difference between this embodiment and embodiment 1 is that the adjusting belt 4 is different. The adjusting belt 4 in this embodiment includes a mounting plate 6, an I-beam wheel 7, a drive cap 8, and an adjusting rope 9.

[0041] Reference Figure 4 and Figure 5 The mounting plate 6 is circular and glued to the drag tongue 122. The rotation of the I-beam wheel 7 is restricted by the mounting plate 6. The drive cap 8 is coaxially sleeved on the I-beam wheel 7. The inner ring side wall of the drive cap 8 is provided with several integrally formed plug-in blocks 81. The outer ring side wall of the I-beam wheel 7 is provided with several plug-in grooves 71. The plug-in grooves 71 correspond one-to-one with the plug-in blocks 81 and are plugged in. When the drive cap 8 is rotated, the plug-in blocks 81 and the plug-in grooves 71 are plugged in and drive the I-beam wheel 7 to rotate.

[0042] Reference Figure 5 The inner wall of the H-beam wheel 7 has a fixed ring with an elastic limiting ring 72. The elastic limiting ring 72 is generally made of rubber and has a certain elasticity and limiting effect. There are two elastic limiting rings 72 distributed along the axial direction of the inner wall of the H-beam wheel 7. The setting of two elastic limiting rings 72 helps to reduce the risk of the drive cap 8 falling off directly when adjusting the tightness of the protective head. A drive rod 82 is coaxially fixed on the inner wall of the drive cap 8. A limiting plate 821 is fixedly sleeved on the drive rod 82. The limiting plate 821 slides in cooperation with the inner wall of the H-beam wheel 7. When a certain force is applied to move the drive cap 8 along the axial direction of the H-beam wheel 7, the limiting plate 821 can squeeze the elastic limiting ring 72 and slide out of the limiting range of the elastic limiting ring 72.

[0043] Reference Figure 4 and Figure 5 The end of the drive rod 82 is coaxially fixed with a ratchet 822. A pawl 61 is rotatably mounted on the inner side wall of the mounting plate 6. The pawl 61 is located on one side of the ratchet 822. When the tip of the pawl 61 is inserted between the ratchet teeth of the ratchet 822 and rotates and meshes with the ratchet 822, the limiting plate 821 is limited between the elastic limiting ring 72 and the mounting plate 6. An adjusting rope 9 is provided on both sides of the drag tongue 122. The adjusting rope 9 is generally made of nylon rope. One end of the adjusting rope 9 is fixed to the back head protection part 12, and the other end is fixed to the I-beam wheel 7.

[0044] The implementation principle of Example 2 is as follows: When the head protector needs to be tightened, the drive cover 8 is rotated, which drives the I-beam wheel 7 to rotate. The head protector is tightened by the adjusting rope 9, and the adjusting rope 9 is locked by the ratchet 822 and pawl 61 mechanism to prevent it from retracting. When the head protector needs to be loosened, the drive cover 8 is pulled out and disengaged from the elastic limit ring 72. The ratchet 822 and pawl 61 are separated, and the I-beam wheel 7 can rotate the adjusting rope 9 freely. After adjustment, the drive cover 8 is pushed back to relock.

[0045] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A cushioned electronic headgear for Taekwondo, comprising a headgear body (1), a cushioning and protective assembly (2), and a sensing system (3), characterized in that, The head protection body (1) includes a head protection part (11) and a back head protection part (12). An adjustment notch (121) is provided at the bottom of the back head protection part (12). An adjustment band (4) is connected to both sides of the adjustment notch (121). A drag tongue (122) is provided in the middle of the adjustment notch (121). The drag tongue (122) is perpendicular to the length direction of the adjustment band (4), and its end is integrally formed with the head protection body (1). The drag tongue (122) is located on the side of the adjustment band (4) facing the inside of the head protection body (1).

2. The cushioned electronic headgear for Taekwondo according to claim 1, characterized in that, The adjustment band (4) is made of elastic webbing material. One end of it is fixed to the back head protection part (12), and the other end is provided with a first Velcro (41). A first adhesive area (123) adapted to the first Velcro (41) is provided at the corresponding position on the back head protection part (12).

3. The cushioned electronic headgear for Taekwondo according to claim 1, characterized in that, The head protection body (1) also includes a cheek protection part (13), which is arc-shaped and fits the contour of the cheek, and its edge smoothly transitions with the head protection part (11).

4. The cushioned electronic headgear for Taekwondo according to claim 1, characterized in that, The headgear body (1) is provided with several ventilation holes (5).

5. A buffered electronic headgear for Taekwondo according to claim 1, characterized in that, The buffer protection component (2) is located inside the head protection body (1). The buffer protection component (2) includes a first buffer layer (21), a second buffer layer (22), and a third buffer layer (23) from the inside out. The sensing system (3) includes a piezoelectric coil (31), a magnetic coil (32), and a signal processor (33) with an integrated Bluetooth transmission module. The piezoelectric coil (31) is located between the first buffer layer (21) and the second buffer layer (22). The magnetic coil (32) is located between the second buffer layer (22) and the third buffer layer (23). The head protection part (11) has a recessed placement groove (111) at the top of the head. The signal processor (33) is located in the placement groove (111). The signal connection ends of the piezoelectric coil (31) and the magnetic coil (32) converge in the placement groove (111) and are electrically connected to the signal processor (33).

6. A buffered electronic headgear for Taekwondo according to claim 5, characterized in that, The piezoelectric coil (31) and magnetic coil (32) are arranged in several turns along the circumference of the head protector body (1). Each turn of the piezoelectric coil (31) has a corrugated line, and each turn of the magnetic coil (32) has a straight line.

7. A buffered electronic headgear for Taekwondo according to claim 5, characterized in that, The head protection part (11) is provided with a cover (112) covering the placement groove (111). One side of the cover (112) is fixed to the head protection part (11). The side of the cover (112) facing the placement groove (111) is provided with a second Velcro (1121) around the outer edge of the placement groove (111). A second adhesive area (113) adapted to the second Velcro (1121) is provided at a corresponding position on the head protection part (11).

8. A buffered electronic headgear for Taekwondo according to claim 1, characterized in that, The adjusting belt (4) includes a mounting plate (6), a bobbin (7), a drive cap (8), and an adjusting rope (9). The mounting plate (6) is mounted on the drag tongue (122). The bobbin (7) is rotatably connected to the mounting plate (6). The drive cap (8) is coaxially sleeved on the bobbin (7). Several insertion blocks (81) are provided on the inner ring sidewall of the drive cap (8). Several insertion slots (71) that engage with the insertion blocks (81) are provided on the outer ring sidewall of the bobbin (7). An elastic limiting ring (72) is provided on the inner cylinder wall of the bobbin (7). A drive rod (82) is coaxially provided on the inner sidewall of the drive cap (8). An adjusting rope (9) is sleeved on the drive rod (82). A limiting plate (821) is provided that slides with the inner wall of the I-beam wheel (7). A ratchet (822) is coaxially sleeved at the end of the drive rod (82). A pawl (61) is rotatably provided on the inner side wall of the mounting plate (6). The pawl (61) is located on one side of the ratchet (822). When the tip of the pawl (61) is inserted between the ratchet teeth of the ratchet (822) and rotates and meshes with the ratchet (822), the limiting plate (821) is limited between the elastic limiting ring (72) and the mounting plate (6). An adjusting rope (9) is provided on both sides of the drag tongue (122). One end of the adjusting rope (9) is fixed to the back head protection part (12), and the other end is fixed to the I-beam wheel (7).

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