A hydraulic drilling vehicle suitable for head-on protection

Abstract

The present invention belongs to the technical field of underground development equipment for coal mines, and specifically relates to a hydraulic drilling vehicle suitable for head protection. It includes a traveling part, a machine body, two sets of drill arm devices, two sets of head protection devices and a hydraulic pump station system; the traveling mechanism is arranged below the machine body, the two sets of drill arm devices are symmetrically arranged on the left and right sides of the front of the machine body, the two sets of head protection devices are symmetrically arranged above the two sets of drill arm devices, and the hydraulic pump station system is arranged at the rear of the machine body. The present invention is suitable for a multifunctional hydraulic drilling vehicle for head protection and head drilling in underground coal mine tunnels. The present invention has high working efficiency and low production cost, avoids long-term manual empty top operation, and reduces the probability of personnel injury due to coal wall collapse.

Description

Technical Field

[0001] The invention belongs to the technical field of underground coal mine development equipment, and specifically relates to a hydraulic drilling vehicle suitable for head protection, and is suitable for protecting the head of underground coal mine tunnels and performing head drilling. Background Art

[0002] In domestic coal mines, when constructing head-on water exploration holes, anti-burst holes, prediction holes and gas extraction holes, traditional manual scaffolding is often used to hang nets and anchor the head, and then a special drilling rig is used for drilling operations. According to the process requirements of coal mines, this traditional operation method not only has a high construction frequency, is time-consuming and labor-intensive, but also has a very high risk factor. First, the scaffolding is fixed in front of the head coal wall. In the absence of protective measures, the collapsed coal blocks are very likely to cause casualties; secondly, during the process of manual net anchoring, the loose head coal wall will collapse, threatening the life safety of the operators; finally, after the drilling operation is completed, the anchor net needs to be removed manually, and the head coal wall is very likely to collapse again, causing secondary injuries to the operators. In general, the traditional construction process is complicated and takes a long time. In the construction process, the head coal wall of the working face often collapses, causing injuries, which seriously affects the personal safety of the operators. Summary of the invention

[0003] The purpose of the present invention is to provide a multifunctional hydraulic drilling vehicle which is suitable for head protection and anchoring in coal mines and has the function of drilling head water exploration holes, anti-burst holes, prediction holes and gas extraction holes.

[0004] The technical solution of the present invention is:

[0005] A hydraulic drilling vehicle suitable for head-on protection comprises a walking part, a machine body, two sets of drill arm devices, two sets of head-on protection devices and a hydraulic pump station system; the walking mechanism is arranged below the machine body, the two sets of drill arm devices are symmetrically arranged on the left and right sides of the front of the machine body, the two sets of head-on protection devices are symmetrically arranged above the two sets of drill arm devices, and the hydraulic pump station system is arranged at the rear of the machine body; wherein: the walking part is composed of two sets of left-right symmetrical walking mechanisms, each set of walking mechanisms is composed of a crawler frame, a redirecting sprocket, a driving sprocket, a crawler, a tensioning oil cylinder, a reducer and a travel hydraulic motor, a redirecting sprocket is arranged at the front end of the track frame, a driving sprocket is arranged at the rear end of the track frame, the track is wound between the redirecting sprocket and the driving sprocket, a tensioning cylinder is arranged on the track frame and the output shaft of the tensioning cylinder is connected with the rotating shaft of the redirecting sprocket, a reducer is installed in the inner cavity of the driving sprocket, a housing of the reducer is connected with the driving sprocket to drive the driving sprocket to rotate through the rotation of the housing of the reducer, an output shaft of the travel hydraulic motor is connected with an input shaft of the reducer to provide a rotation drive for the reducer, and the travel hydraulic motor is installed on the reducer;

[0006] The machine body is composed of a connecting beam, a cylinder seat, a supporting telescopic cylinder, a supporting telescopic sleeve, a front supporting cylinder, a mobile platform, a fixed platform, and a mobile guide rail. The connecting beam is arranged above the two crawler frames and located in the middle of the two crawlers. The cylinder seat is arranged in the middle of the rear part of the lower surface of the connecting beam. One end of the supporting telescopic cylinder is connected to the cylinder seat, and the other end of the supporting telescopic cylinder is connected to one end of the supporting telescopic sleeve. The front end of the supporting telescopic sleeve is fixed to the front supporting cylinder, and the supporting telescopic sleeve is located in the front part of the lower surface of the connecting beam. The fixed platform is arranged on the upper surface of the connecting beam. The mobile platform is arranged on the upper surface of the fixed platform, and the front end of the mobile platform is connected and fixed to the front end of the supporting telescopic sleeve. The mobile guide rail is arranged in the front part of the fixed platform and located on both sides of the mobile platform. The supporting telescopic sleeve and the mobile platform connected to the supporting telescopic sleeve are extended and retracted by the extension and retraction of the supporting telescopic cylinder, thereby driving the drill arm arranged above the machine body to extend and retract.

[0007] The two sets of drill arm devices adopt the structure of patent number ZL201110207324.9, and the invention name is "an all-round rotating drill arm device".

[0008] The two sets of head-on protection devices are symmetrically arranged above the drill arm part, and each set of head-on protection devices is composed of a fixed seat, a rotary cylinder, a rotary seat, a supporting cylinder, a telescopic arm, an adjusting cylinder, and a net protection device; the fixed seat is hingedly connected to the swivel seat, one end of the rotary cylinder is hingedly connected to the fixed seat, and the other end is hingedly connected to the swivel seat, and the rotary cylinder is telescopic to push the swivel seat to rotate around the fixed seat in the horizontal direction; one end of the telescopic arm is hingedly connected to the swivel seat, and the other end is hingedly connected to the net protection device, one end of the supporting cylinder is hingedly connected to the swivel seat, and the other end is hingedly connected to the telescopic arm, and the supporting cylinder is telescopic to push the telescopic arm to rotate around the swivel seat in the vertical direction; one end of the adjusting cylinder is hingedly connected to the telescopic arm, and the other end is hingedly connected to the net protection device, and the adjusting cylinder is telescopic to push the net protection device to rotate around the telescopic arm in the vertical direction.

[0009] The telescopic arm of the present invention is composed of an outer arm, a telescopic cylinder and an inner arm; the inner arm is arranged in the inner cavity of the outer arm, the telescopic cylinder is arranged in the inner cavity of the inner arm, and one end of the telescopic cylinder is hinged to the outer arm, and the other end is hinged to the inner arm; the telescopic cylinder is telescopic to push the inner arm to telescope.

[0010] The net protection device described in the present invention is composed of a blocking beam, a blocking beam cylinder, a supporting beam, a No. I net protection cylinder, a small net protection, a No. II net protection cylinder, and a large net protection; the blocking beam and the small net protection are respectively arranged on the left and right sides of the supporting beam and are respectively hinged to the supporting beam; one end of the blocking beam cylinder is hinged to the blocking beam, and the other end is hinged to the supporting beam, and the blocking beam cylinder is telescopic to push the blocking beam to rotate; one end of the No. I net protection cylinder is hinged to the supporting beam, and the other end is hinged to the small net protection, and the No. I net protection cylinder is telescopic to push the small net protection to rotate; the large net protection is arranged at the other end of the small net protection and is hinged to the small net protection, one end of the No. II net protection cylinder is hinged to the large net protection, and the other end is hinged to the small net protection, and the No. II net protection cylinder is telescopic to push the large net protection to rotate.

[0011] The support beam described in the present invention is composed of a vertical beam, a supporting cylinder and a top beam; the top beam is arranged in the inner cavity of the vertical beam, the supporting cylinder is arranged in the inner cavity of the top beam, and one end of the supporting cylinder is hinged to the vertical beam, and the other end is hinged to the top beam; the extension and retraction of the supporting cylinder pushes the top beam to extend and retract.

[0012] The present invention adopts the above-mentioned technical scheme. The connecting beam in the body part is integrally welded, and the two sides of the connecting beam are connected to the walking mechanism to realize the movement of the whole machine; the net protection device is driven forward by the telescopic cylinder to make the net protection device reach the working position, and the cylinder is adjusted to extend and retract, and the auxiliary beam cylinder, net protection cylinder and support cylinder move to better meet the head-on net protection conditions; the support telescopic cylinder is extended and retracted to push the sliding platform to translate along the guide rail, so that the drill arm part moves as a whole to reach the drilling position, and the drilling operations at different heights and positions of the head are completed, so as to achieve the head-on protection and drilling pre-extraction detection holes. The head protection device of the present invention enables the net protection device to reach various positions through the extension and retraction of the oil cylinder, assists manual work to complete the head net hanging, and achieves the function of protecting the head, eliminating the tedious labor of manually building scaffolding. The full hydraulic operation reduces the labor intensity of workers and avoids the danger of workers working on the top without a roof. Its main actions include: outward rotation and up and down lifting of the net protection device, front and back extension of the net protection device by 0 to 2000mm, up and down adjustment of the net protection device, rotation of large and small nets and beams, and up and down extension of the top beam by 0 to 1200mm. The drill arm part of the present invention is fixed on the left and right sides of the front end of the machine body part, and is the executive mechanism of the unit for drilling operations. It is connected to the airborne anchor drilling rig, and the drilling and anchor cable tightening actions of the machine are completed through the cooperation of the two. The main actions it needs to achieve include: up and down lifting of the arm body, outward rotation of the drill arm, overall front and rear extension of the drill arm square tube by 0 to 600 mm, overall front and rear extension of the drill arm swivel seat by 0 to 500 mm, free rotation of the propulsion mechanism within a range of 360 degrees, etc. The main components of the drill arm mechanism include: drill arm, drill arm support rod, drill arm swivel seat, propulsion mechanism fixed seat, propulsion mechanism swivel frame, various oil cylinders and other parts.

[0013] The hydraulic mechanism of the present invention includes a motor arranged above the rear end of the connecting beam of the machine body, the output shaft of the motor is connected to a hydraulic pump, the hydraulic pump is connected to an oil tank, an oil suction filter and an oil return filter are arranged on the oil tank, and a cooler communicating with the oil suction filter and the oil return filter is arranged between the oil suction filter and the oil return filter. The hydraulic mechanism is composed of a pump station, an operating table, an oil cylinder, a hydraulic motor, an oil tank, a valve group and interconnected pipes. The functions of the hydraulic system are mainly to realize the walking of the machine, various actions of the head protection device, various actions of the drill arm and the airborne anchor drilling rig, the tensioning of the crawler and provide the power required for drilling pre-draining holes and detecting holes.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. Mechanization - The drilling vehicle integrates auxiliary head-on protection and head-on drilling. It replaces the original labor mode of manually building scaffolding and hanging nets for protection and using other drilling rigs for drilling. It makes underground equipment intensive and liberates heavy manual labor. It effectively reduces production costs while reducing workers' labor intensity and improving work efficiency.

[0016] 2. Safety - It replaces manual hanging of nets and drilling, avoids long-term manual empty-top operations, and reduces the chance of injury caused by coal wall collapse.

[0017] 3. Energy saving - This machine adopts a load-sensitive imported system, and the plunger pump + proportional reversing valve is more energy-efficient. In addition, the pump station produces very little noise, which greatly reduces the harm of noise to the human body.

[0018] In short, the drilling vehicle of the present invention changes the production process and operation form of the existing coal mine head protection and drilling of head pre-extraction detection holes. On the one hand, the head protection device on the drilling vehicle can replace manual protection of the head, and on the other hand, it replaces manual drilling of head pre-extraction detection holes. One machine has multiple uses, which reduces the labor intensity of workers and provides labor protection for empty top operations; it is suitable for a cross-section (width × height) of 6300×3800mm, one machine has multiple functions, and reduces the equipment configuration of the tunnel on the basis of function realization, saving a lot of equipment cost for the production of the mine, making the equipment matching more scientific and reasonable, and the production organization more optimized. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the present invention;

[0020] Figure 2 yes Figure 1 A top view of

[0021] Figure 3 It is a structural schematic diagram of the walking mechanism of the present invention;

[0022] Figure 4 yes Figure 3 A top view of

[0023] Figure 5 It is a structural schematic diagram of the body part of the present invention;

[0024] Figure 6 yes Figure 5 A top view of

[0025] Figure 7 It is a structural schematic diagram of the head-on protection device of the present invention;

[0026] Figure 8 It is a schematic diagram of the telescopic arm structure in the head-on protection device of the present invention;

[0027] Fig. 9It is a schematic diagram of the structure of the protective net device in the head-on protection device of the present invention;

[0028] Fig.10 It is a schematic diagram of the support beam structure in the net protection device of the present invention. DETAILED DESCRIPTION

[0029] like Figure 1 , Figure 2 As shown, the hydraulic drilling vehicle suitable for head-on protection described in this embodiment includes a walking part 1, a body part 2, two sets of drill arm devices 3, two sets of head-on protection devices 4 and a hydraulic pump station system 5; the walking mechanism 1 is arranged below the body part 2, the two sets of drill arm devices 3 are symmetrically arranged on the left and right sides of the front of the body part 2, the two sets of head-on protection devices 4 are symmetrically arranged above the two sets of drill arm devices 3, and the hydraulic pump station system 5 is arranged at the rear of the body part 2; wherein: Figure 3 , Figure 4 As shown, the walking part 1 is composed of two sets of symmetrical walking mechanisms, each set of walking mechanisms is composed of a crawler frame 1-1, a redirecting sprocket 1-2, a driving sprocket 1-3, a crawler 1-4, a tensioning cylinder 1-5, a reducer 1-6 and a walking hydraulic motor 1-7. The redirecting sprocket 1-2 is arranged at the front end of the crawler frame 1-1, the driving sprocket 1-3 is arranged at the rear end of the crawler frame 1-1, the crawler 1-4 is wound between the redirecting sprocket 1-2 and the driving sprocket 1-3, the tensioning cylinder 1-5 The output shaft of the tensioning cylinder 1-5 is arranged on the crawler frame 1-1 and is connected to the rotating shaft of the redirecting sprocket 1-2. The reducer 1-6 is installed in the inner cavity of the driving sprocket 1-3. The outer shell of the reducer 1-6 is connected to the driving sprocket 1-3 so as to drive the driving sprocket 1-3 to rotate through the rotation of the outer shell of the reducer 1-6. The output shaft of the travel hydraulic motor 1-7 is connected to the input shaft of the reducer 1-6 to provide rotation drive for the reducer. The travel hydraulic motor 1-7 is installed on the reducer 1-6.

[0030] like Figure 5 , Figure 6As shown, the machine body 2 is composed of a connecting beam 2-1, a cylinder seat 2-2, a supporting telescopic cylinder 2-3, a supporting telescopic sleeve 2-4, a front supporting cylinder 2-5, a mobile platform 2-6, a fixed platform 2-7, and a mobile guide rail 2-8. The connecting beam 2-1 is arranged above the two crawler frames 1-1 and in the middle of the two crawlers 1-4. The cylinder seat 2-2 is arranged in the middle of the rear part of the lower surface of the connecting beam 2-1. One end of the supporting telescopic cylinder 2-3 is connected to the cylinder seat 2-2, and the other end of the supporting telescopic cylinder 2-3 is connected to the cylinder seat 2-2. One end is connected to one end of the supporting telescopic sleeve 2-4, the front end of the supporting telescopic sleeve 2-4 is fixed to the front supporting oil cylinder 2-5, and the supporting telescopic sleeve 2-4 is located at the front of the lower surface of the connecting beam 2-1, the fixed platform 2-7 is set on the upper surface of the connecting beam 2-1, the mobile platform 2-6 is set on the upper surface of the fixed platform 2-7, and the front end of the mobile platform 2-6 is connected and fixed to the front end of the supporting telescopic sleeve 2-4, and the mobile guide rail 2-8 is set at the front of the fixed platform 2-7 and located on both sides of the mobile platform 2-6. The supporting telescopic sleeve 2-4 and the mobile platform 2-6 connected to the supporting telescopic sleeve 2-4 are driven to extend and retract by the extension and retraction of the supporting telescopic oil cylinder 2-3, thereby driving the drill arm 3 set above the machine body 2 to extend and retract.

[0031] The above two sets of drill arm devices 3 in the present invention adopt the structure of patent number ZL201110207324.9, and the invention name is "an omnidirectional rotating drill arm device".

[0032] like Figure 7 The two sets of head protection devices 4 are symmetrically arranged above the drill arm part 3, and each set of head protection devices 4 is composed of a fixed seat 4-1, a rotary cylinder 4-2, a rotary seat 4-3, a supporting cylinder 4-4, a telescopic arm 4-5, an adjustment cylinder 4-6, and a protective net device 4-7; the fixed seat 4-1 is hingedly connected to the rotary seat 4-3, one end of the rotary cylinder 4-2 is hingedly connected to the fixed seat 4-1, and the other end is hingedly connected to the rotary seat 4-3, and the rotary cylinder 4-2 is telescopic to push the rotary seat to rotate around the fixed seat 4-1 in the horizontal direction One end of the telescopic arm 4-5 is hinged to the swivel seat 4-3, and the other end is hinged to the net protection device (4-7); one end of the supporting cylinder 4-4 is hinged to the swivel seat 4-3, and the other end is hinged to the telescopic arm (4-5); the supporting cylinder 4-4 is telescopic to push the telescopic arm 4-5 to rotate around the swivel seat 4-3 in the vertical direction; one end of the adjusting cylinder 4-6 is hinged to the telescopic arm 4-5, and the other end is hinged to the net protection device (4-7); the adjusting cylinder 4-6 is telescopic to push the net protection device 4-7 to rotate around the telescopic arm 4-5 in the vertical direction.

[0033] like Figure 8As shown, the telescopic arm 4-5 is composed of an outer arm 4-5-1, a telescopic cylinder 4-5-2, and an inner arm 4-5-3; the inner arm 4-5-3 is arranged in the inner cavity of the outer arm 4-5-1, the telescopic cylinder 4-5-2 is arranged in the inner cavity of the inner arm 4-5-3, and one end of the telescopic cylinder 4-5-2 is hinged to the outer arm 4-5-1, and the other end is hinged to the inner arm 4-5-3; the telescopic cylinder 4-5-2 is telescopic to push the inner arm 4-5-3 to telescope.

[0034] like Fig. 9 As shown, the net protection device 4-7 is composed of a blocking beam 4-7-1, a blocking beam cylinder 4-7-2, a support beam 4-7-3, a No. I net protection cylinder 4-7-4, a small net protection 4-7-5, a No. II net protection cylinder 4-7-6, and a large net protection 4-7-7; the blocking beam 4-7-1 and the small net protection 4-7-5 are respectively arranged on the left and right sides of the support beam 4-7-3 and are respectively hinged to the support beam 4-7-3; one end of the blocking beam cylinder 4-7-2 is hinged to the blocking beam 4-7-1, and the other end is hinged to the support beam 4-7-3, and the blocking beam cylinder 4-7-2 is extended The retraction and expansion of the guardrail beam 4-7-1 are used to rotate; one end of the No. I guardrail cylinder 4-7-4 is hinged to the support beam 4-7-3, and the other end is hinged to the small guardrail 4-7-5. The No. I guardrail cylinder 4-7-4 is retracted and expanded to push the small guardrail 4-7-5 to rotate; the large guardrail 4-7-7 is arranged at the other end of the small guardrail 4-7-5 and is hinged to the small guardrail 4-7-5, one end of the No. II guardrail cylinder 4-7-6 is hinged to the large guardrail 4-7-7, and the other end is hinged to the small guardrail 4-7-5. The No. II guardrail cylinder 4-7-6 is retracted and expanded to push the large guardrail 4-7-7 to rotate.

[0035] like Fig.10 As shown, the supporting beam 4-7-3 is composed of a vertical beam 4-7-3-1, a supporting cylinder 4-7-3-2 and a top beam 4-7-3-3; the top beam 4-7-3-3 is arranged in the inner cavity of the vertical beam 4-7-3-1, the supporting cylinder 4-7-3-2 is arranged in the inner cavity of the top beam 4-7-3-3, and one end of the supporting cylinder 4-7-3-2 is hinged to the vertical beam 4-7-3-1, and the other end is hinged to the top beam 4-7-3-3; the supporting cylinder 4-7-3-2 is extended and retracted to push the top beam 4-7-3-3 to extend and retract.

Claims

1. A hydraulic drilling vehicle suitable for head-on protection, characterized by: The invention comprises a walking part (1), a machine body (2), two sets of drill arm devices (3), two sets of front protection devices (4) and a hydraulic pump station system (5); the walking part (1) is arranged below the machine body (2), the two sets of drill arm devices (3) are symmetrically arranged on the left and right sides of the front of the machine body (2), the two sets of front protection devices (4) are symmetrically arranged above the two sets of drill arm devices (3), and the hydraulic pump station system (5) is arranged at the rear of the machine body (2); The walking part (1) is composed of two sets of bilaterally symmetrical walking mechanisms, each set of walking mechanisms is composed of a crawler frame (1-1), a redirecting sprocket (1-2), a driving sprocket (1-3), a crawler (1-4), a tensioning cylinder (1-5), a reducer (1-6) and a walking hydraulic motor (1-7), the redirecting sprocket (1-2) is arranged at the front end of the crawler frame (1-1), the driving sprocket (1-3) is arranged at the rear end of the crawler frame (1-1), the crawler (1-4) is wound between the redirecting sprocket (1-2) and the driving sprocket (1-3), the tensioning cylinder (1-5) is arranged at the rear end of the crawler frame (1-1), the crawler (1-4) is wound between the redirecting sprocket (1-2) and the driving sprocket (1-3), and the tensioning cylinder (1-5) is arranged at the rear end of the crawler frame (1-1). ) is arranged on the crawler frame (1-1) and the output shaft of the tensioning cylinder (1-5) is connected to the rotating shaft of the redirecting sprocket (1-2), the reducer (1-6) is installed in the inner cavity of the driving sprocket (1-3), the outer shell of the reducer (1-6) is connected to the driving sprocket (1-3) so that the driving sprocket (1-3) is driven to rotate by the rotation of the outer shell of the reducer (1-6), the output shaft of the travel hydraulic motor (1-7) is connected to the input shaft of the reducer (1-6) to provide rotation drive for the reducer, and the travel hydraulic motor (1-7) is installed on the reducer (1-6); The machine body (2) is composed of a connecting beam (2-1), a cylinder seat (2-2), a supporting telescopic cylinder (2-3), a supporting telescopic sleeve (2-4), a front supporting cylinder (2-5), a moving platform (2-6), a fixed platform (2-7), and a moving guide rail (2-8). The connecting beam (2-1) is arranged above the two crawler frames (1-1) and in the middle of the two crawler frames (1-4). The cylinder seat (2-2) is arranged in the middle of the rear part of the lower surface of the connecting beam (2-1). One end of the supporting telescopic cylinder (2-3) is connected to the cylinder seat (2-2). The other end of the supporting telescopic cylinder (2-3) is connected to one end of the supporting telescopic sleeve (2-4). The front end of the supporting telescopic sleeve (2-4) is connected to the front supporting cylinder. The cylinder (2-5) is fixed, and the supporting telescopic sleeve (2-4) is located at the front of the lower surface of the connecting beam (2-1); the fixed platform (2-7) is arranged on the upper surface of the connecting beam (2-1); the mobile platform (2-6) is arranged on the upper surface of the fixed platform (2-7) and the front end of the mobile platform (2-6) is connected and fixed to the front end of the supporting telescopic sleeve (2-4); the mobile guide rail (2-8) is arranged at the front of the fixed platform (2-7) and is located on both sides of the mobile platform (2-6); the supporting telescopic sleeve (2-4) and the mobile platform (2-6) connected to the supporting telescopic sleeve (2-4) are driven to extend and retract by the extension and retraction of the supporting telescopic oil cylinder (2-3), thereby driving the drilling arm device (3) arranged above the machine body (2) to extend and retract; The two sets of head protection devices (4) are symmetrically arranged above the drill arm device (3), and each set of head protection devices (4) is composed of a fixed seat (4-1), a rotary cylinder (4-2), a rotary seat (4-3), a supporting cylinder (4-4), a telescopic arm (4-5), an adjustment cylinder (4-6), and a protective net device (4-7); the fixed seat (4-1) is hingedly connected to the rotary seat (4-3), one end of the rotary cylinder (4-2) is hingedly connected to the fixed seat (4-1), and the other end is hingedly connected to the rotary seat (4-3), and the rotary cylinder (4-2) is telescopically pushed to move the rotary seat around the fixed seat (4-1) in the horizontal direction. -1) rotation; one end of the telescopic arm (4-5) is hinged to the swivel seat (4-3), and the other end is hinged to the net protection device (4-7); one end of the supporting oil cylinder (4-4) is hinged to the swivel seat (4-3), and the other end is hinged to the telescopic arm (4-5); the supporting oil cylinder (4-4) is telescopic to push the telescopic arm (4-5) to rotate around the swivel seat (4-3) in the vertical direction; one end of the adjusting oil cylinder (4-6) is hinged to the telescopic arm (4-5), and the other end is hinged to the net protection device (4-7); the adjusting oil cylinder (4-6) is telescopic to push the net protection device (4-7) to rotate around the telescopic arm (4-5) in the vertical direction; The telescopic arm (4-5) is composed of an outer arm (4-5-1), a telescopic cylinder (4-5-2), and an inner arm (4-5-3); the inner arm (4-5-3) is arranged in the inner cavity of the outer arm (4-5-1), the telescopic cylinder (4-5-2) is arranged in the inner cavity of the inner arm (4-5-3), and one end of the telescopic cylinder (4-5-2) is hinged to the outer arm (4-5-1), and the other end is hinged to the inner arm (4-5-3); the telescopic cylinder (4-5-2) is telescopic to push the inner arm (4-5-3) to telescope; The net protection device (4-7) is composed of a blocking beam (4-7-1), a blocking beam cylinder (4-7-2), a support beam (4-7-3), a No. I net protection cylinder (4-7-4), a small net protection (4-7-5), a No. II net protection cylinder (4-7-6), and a large net protection (4-7-7); the blocking beam (4-7-1) and the small net protection (4-7-5) are respectively arranged on the left and right sides of the support beam (4-7-3) and are respectively hinged to the support beam (4-7-3); one end of the blocking beam cylinder (4-7-2) is hinged to the blocking beam (4-7-1), and the other end is hinged to the support beam (4-7-3); the blocking beam cylinder (4-7-2) The guard beam (4-7-1) is pushed and retracted to rotate; one end of the No. Ⅰ net protection cylinder (4-7-4) is hinged to the support beam (4-7-3), and the other end is hinged to the small net protection (4-7-5); the No. Ⅰ net protection cylinder (4-7-4) is retracted to push the small net protection (4-7-5) to rotate; the large net protection (4-7-7) is arranged at the other end of the small net protection (4-7-5) and is hinged to the small net protection (4-7-5); one end of the No. Ⅱ net protection cylinder (4-7-6) is hinged to the large net protection (4-7-7), and the other end is hinged to the small net protection (4-7-5); the No. Ⅱ net protection cylinder (4-7-6) is retracted to push the large net protection (4-7-7) to rotate; The support beam (4-7-3) is composed of a vertical beam (4-7-3-1), a supporting oil cylinder (4-7-3-2), and a top beam (4-7-3-3); the top beam (4-7-3-3) is arranged in the inner cavity of the vertical beam (4-7-3-1), the supporting oil cylinder (4-7-3-2) is arranged in the inner cavity of the top beam (4-7-3-3), and one end of the supporting oil cylinder (4-7-3-2) is hinged to the vertical beam (4-7-3-1), and the other end is hinged to the top beam (4-7-3-3); the supporting oil cylinder (4-7-3-2) is extended and retracted to push the top beam (4-7-3-3) to extend and retract.

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