A coal mine geological drilling device

Abstract

The application discloses a coal mine geological drilling device and belongs to the field of geological drilling equipment. The coal mine geological drilling device comprises a cart, a through hole is formed in the middle of the cart, hydraulic rods are arranged at the positions of the four corners of the top surface of the cart, four output ends of the hydraulic rods are connected through a cross beam, and the coal mine geological drilling device further comprises a drilling mechanism, a shielding mechanism and the like. The drilling mechanism is arranged directly above the through hole, is fixedly connected with the cross beam, and is used for drilling the coal mine geology. The shielding mechanism is provided with two shielding mechanisms which are arranged on the two sides of the drilling mechanism respectively, the middle portions of the outer walls of the two shielding mechanisms are connected with the top surface of the cart, and the outer walls of the shielding mechanisms and the bottom surface of the cross beam are slidably connected. The coal mine geological drilling device can not only drill the coal mine geology, but also shield the materials splashed during drilling, so that the safety of drilling by the staff is ensured.

Description

Technical Field

[0001] This invention relates to the field of geological drilling equipment, and more specifically, to a coal mine geological drilling device. Background Technology

[0002] With the rapid development of the social economy, the demand for coal is increasing. New coal mine exploration is essential for ensuring coal production. The tasks of coal exploration include understanding coal-bearing strata, coal seams and mineable coal seams, coal quality and coal type, geological structure, hydrogeological conditions and other mining technical conditions (engineering geological conditions of the roof and floor of the coal seam, gas composition and content of the coal seam, coal dust explosion, coal spontaneous combustion tendency, geothermal and gradient changes, etc.).

[0003] Regarding the aforementioned technologies, the inventors believe that the following defects exist: When existing coal mine geological drilling equipment performs rotational impact, it is easy to flip up particles such as gravel upwards, which can cause these particles to scatter and potentially injure personnel nearby, thus reducing the safety of coal mine geological drilling. Therefore, we propose a coal mine geological drilling equipment to solve the above-mentioned problems. Summary of the Invention

[0004] 1. Technical problems to be solved

[0005] In view of the problems existing in the prior art, the purpose of this invention is to provide a coal mine geological drilling device that can not only conduct coal mine geological drilling, but also shield the materials splashed during drilling, thus ensuring the safety of the drilling personnel.

[0006] 2. Technical Solution

[0007] To solve the above problems, the present invention adopts the following technical solution.

[0008] A coal mine geological drilling device includes a trolley with a through hole in the middle. Hydraulic rods are installed at the four corners of the top surface of the trolley, and the output ends of the four hydraulic rods are connected by a crossbeam. The device also includes:

[0009] A drilling mechanism, wherein the drilling mechanism is disposed directly above the through hole, and the drilling mechanism is fixedly connected to the crossbeam, and the drilling mechanism is used for drilling coal mine geology; and

[0010] The shielding mechanism is provided in two parts, which are respectively located on both sides of the drilling mechanism. The middle part of the outer wall of the two shielding mechanisms is connected to the top surface of the trolley, and the outer wall of the shielding mechanism near the top is slidably connected to the bottom surface of the crossbeam. The shielding mechanism is used to shield and protect the drilling mechanism.

[0011] Furthermore, the drilling mechanism includes a motor located in the middle of the top surface of the crossbeam and a drill rod located directly above the through hole, with the top end of the drill rod connected to the output end of the motor via a coupling.

[0012] Furthermore, the shielding mechanism includes a hollow protective plate, a lifting plate is inserted into the top of the hollow protective plate, a support component is provided in the middle of the outer wall of the hollow protective plate, and the bottom end of the support component is connected to the top surface of the trolley.

[0013] A positioning component is provided on the outer wall of the lifting plate near the top, and the top of the positioning component is slidably connected to the bottom surface of the crossbeam.

[0014] A rolling assembly is provided on the outer wall of the hollow protective plate near the bottom, and the bottom surface of the rolling assembly is in rolling contact with the top surface of the trolley.

[0015] Furthermore, the top-view inner cavity shape of the hollow protective plate is the same as the top-view shape of the lifting plate, and the two form an embedded structure. Both the hollow protective plate and the lifting plate are semi-circular.

[0016] Furthermore, the shielding mechanism also includes a handle, which is located in the middle and upper part of the outer wall of the hollow protective panel. The handle is used to facilitate the user to pull the hollow protective panel left and right.

[0017] Furthermore, the support assembly includes a vertical plate disposed on one side of the top surface of the trolley. Insertion holes are provided on both sides of one side wall of the vertical plate near the top. An adjustment rod is inserted into the inner cavity of each insertion hole. One end of the two adjustment rods is connected to the outer wall surface of the hollow protective plate through a support plate.

[0018] Limiting holes are provided on both sides of the top surface of the upright plate, and the limiting hole and the insertion hole on the same side are connected in a conductive manner. A pressing part is provided on the top of the upright plate, and the bottom surface of the pressing part is respectively connected to the two limiting holes on both sides.

[0019] The bottom center of the upright plate has a notch.

[0020] Furthermore, the pressing part includes a pressing frame, the two bottom ends of which are respectively inserted and connected to the two limiting holes;

[0021] The pressure frame has a positioning hole in the middle, and a locking button is inserted into the inner cavity of the positioning hole. The top surface of the upright plate has a screw hole in the middle, and the bottom end of the locking button is rotatably connected to the inner cavity of the screw hole.

[0022] Furthermore, the positioning component includes a connecting rod, the bottom end of which is connected to the outer wall of the lifting plate via a fixing plate, and the top end of the connecting rod is provided with a shaped slider. The top surface of the crossbeam is provided with a shaped groove for sliding connection of the shaped slider.

[0023] Furthermore, the shape of the irregular groove is adapted to the shape of the irregular slider, and the two form an embedded structure.

[0024] Furthermore, the rolling assembly includes a support plate disposed at a lower position in the middle of the outer wall of the hollow protective plate, and a wheel disposed on the bottom surface of the support plate, the bottom end of the wheel being rolledly connected to the top surface of the trolley.

[0025] 3. Beneficial effects

[0026] Compared with the prior art, the advantages of this invention are:

[0027] This design utilizes a trolley to provide space for drilling through holes and to install and secure four hydraulic rods. These four hydraulic rods, connected to a crossbeam, allow for the installation and adjustment of the drilling mechanism. This facilitates the drilling mechanism's bottom penetration through the through hole for coal mine geological exploration, enabling workers to easily obtain coal mine geological materials. Two shielding mechanisms, mounted on the top surface of the trolley, protect the drilling mechanism. By adjusting the spacing between the two shielding mechanisms, the drilled material can be easily discharged, ensuring that it does not interfere with the equipment's geological exploration and preventing material from splashing everywhere, thus guaranteeing the safety of the drilling workers. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the present invention;

[0029] Figure 2 This is a side view of the present invention;

[0030] Figure 3 This is a cross-sectional structural diagram of the present invention;

[0031] Figure 4 This is a schematic diagram of the drilling mechanism structure of the present invention;

[0032] Figure 5 This is a schematic diagram of the shielding mechanism of the present invention;

[0033] Figure 6 This is a schematic diagram of the support component guarantee structure of the present invention;

[0034] Figure 7 This is a schematic diagram of the pressing part structure of the present invention;

[0035] Figure 8 This is a schematic diagram of the positioning component structure of the present invention;

[0036] Figure 9 This is a schematic diagram of the rolling component structure of the present invention.

[0037] Explanation of the labels in the diagram:

[0038] 1. Trolley; 2. Through hole; 3. Hydraulic rod; 4. Crossbeam; 5. Drilling mechanism; 51. Motor; 52. Coupling; 53. Drill rod; 6. Shielding mechanism; 61. Hollow guard plate; 62. Lifting plate; 63. Support assembly; 631. Vertical plate; 632. Insertion hole; 633. Adjusting rod; 634. Support plate; 635. Limiting hole; 636. Holding part; 6361. Pressure frame; 6362. Positioning hole; 6363. Locking button; 637. Screw hole; 638. Notch; 64. Positioning assembly; 641. Connecting rod; 642. Fixing plate; 643. Irregularly shaped slider; 65. Handle; 66. Rolling assembly; 661. Support plate; 662. Wheel. Detailed Implementation

[0039] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0040] Example:

[0041] Please see Figures 1-3 A coal mine geological drilling device includes a trolley 1 with a through hole 2 in the middle and hydraulic rods 3 at the four corners of the top surface of the trolley 1. The output ends of the four hydraulic rods 3 are connected by a crossbeam 4. The device also includes a drilling mechanism 5, which is located directly above the through hole 2 and is fixedly connected to the crossbeam 4. The drilling mechanism 5 is used for drilling coal mine geology. Two shielding mechanisms 6 are provided, which are respectively located on both sides of the drilling mechanism 5. The middle of the outer wall of the two shielding mechanisms 6 is connected to the top surface of the trolley 1, and the outer wall of the shielding mechanism 6 near the top is slidably connected to the bottom surface of the crossbeam 4. The shielding mechanisms 6 are used to shield and protect the drilling mechanism 5.

[0042] The trolley 1 provides space for opening the through hole 2 and also allows for the installation and fixation of four hydraulic rods 3. These four hydraulic rods 3, connected to the crossbeam 4, enable the installation and adjustment of the drilling mechanism 5, facilitating the bottom of the drilling mechanism 5 to penetrate the through hole 2 for coal mine geological drilling. This allows workers to easily obtain coal mine geological materials. Two shielding mechanisms 6, installed on the top surface of the trolley 1, protect the drilling mechanism 5. Adjusting the distance between the two shielding mechanisms 6 allows for easy discharge of drilled material, ensuring it does not interfere with geological exploration and preventing material from splashing everywhere, thus guaranteeing the safety of the drilling workers.

[0043] See Figure 3 , Figure 4 The drilling mechanism 5 includes a motor 51 located in the middle of the top surface of the crossbeam 4 and a drill rod 53 located directly above the through hole 2. The top end of the drill rod 53 is connected to the output end of the motor 51 via a coupling 52. The motor 51 in the drilling mechanism 5 can be installed on the top surface of the crossbeam 4 and can also be installed on the drill rod 53 via the coupling 52, so that the motor 51 can easily drive the drill rod 53 to rotate, thereby enabling the drill rod 53 to drill through the geology.

[0044] See Figure 1 , Figure 5 The shielding mechanism 6 includes a hollow protective plate 61, a lifting plate 62 inserted into the top of the hollow protective plate 61, a support component 63 provided in the middle of the outer wall of the hollow protective plate 61, and the bottom end of the support component 63 connected to the top surface of the trolley 1; a positioning component 64 is provided on the outer wall of the lifting plate 62 near the top, and the top end of the positioning component 64 is slidably connected to the bottom surface of the crossbeam 4; a rolling component 66 is provided on the outer wall of the hollow protective plate 61 near the bottom, and the bottom surface of the rolling component 66 is slidably connected to the top surface of the trolley 1.

[0045] The support component 63 in the shielding mechanism 6 can be installed on one side of the top surface of the trolley 1, and the hollow protective plate 61 can be installed and its position adjusted. This allows the operator to move the hollow protective plate 61 closer to or further away from the drill rod 53. The hollow protective plate 61 can also be used to insert and install the lifting plate 62, facilitating its lifting and lowering within the cavity. It can also be combined to form a protective cover, preventing material from the drill rod 53 from splashing and ensuring the safety of the operator during drilling. Since the lifting plate 62 has a positioning component 64 on its outer wall near the top, and the top of the positioning component 64 is slidably connected to the bottom surface of the crossbeam 4, the positioning component 64 can both lift the lifting plate 62 and allow it to adjust its position left and right along with the hollow protective plate 61. The rolling component 66 can both lift the hollow protective plate 61 and allow it to roll on the top surface of the trolley 1, making it easy for the operator to pull and adjust the position of the hollow protective plate 61.

[0046] See Figure 5 The top-view inner cavity shape of the hollow guard plate 61 is the same as the top-view shape of the lifting plate 62, and the two form an embedded structure. Both the hollow guard plate 61 and the lifting plate 62 are semi-circular, which allows the lifting plate 62 to move smoothly up and down in the inner cavity of the hollow guard plate 61. At the same time, the lifting plate 62 and the hollow guard plate 61 in the two shielding mechanisms 6 can be combined to form a barrier, thereby preventing the material drilled out by the drill rod 53 from splashing.

[0047] See Figure 5The shielding mechanism 6 also includes a handle 65, which is located in the middle and upper part of the outer wall of the hollow protective plate 61. Through the handle 65, the user can easily pull the hollow protective plate 61 to move it left and right, thereby adjusting the position of the hollow protective plate 61.

[0048] See Figure 1 , Figure 6 The support assembly 63 includes a vertical plate 631 disposed on one side of the top surface of the trolley 1. Insertion holes 632 are provided on both sides of one side wall of the vertical plate 631 near the top. An adjusting rod 633 is inserted into the inner cavity of each insertion hole 632. One end of each adjusting rod 633 is connected to the outer wall surface of the hollow protective plate 61 via a support plate 634. Limiting holes 635 are provided on both sides of the top surface of the vertical plate 631, and the limiting holes 635 and insertion holes 632 on the same side are electrically connected. A pressing part 636 is provided above the vertical plate 631, and the two sides of the bottom surface of the pressing part 636 are respectively inserted into and connected to the two limiting holes 635. A notch 638 is provided in the middle of the bottom end of the vertical plate 631.

[0049] The upright plate 631 in the support assembly 63 can be fixed to the top surface of the trolley 1 and provide space for the insertion hole 632 and the limiting hole 635. The adjusting rod 633 can be inserted and installed through the insertion hole 632, so that the adjusting rod 633 can move easily within the insertion hole 632. At the same time, since one end of the adjusting rod 633 is connected to the outer wall surface of the hollow protective plate 61 through the support plate 634, the adjusting rod 633 can limit the movement of the hollow protective plate 61, thereby improving the stability of the hollow protective plate 61 during use. The pressing part 636 can cooperate with the limiting hole 635 to limit the adjusting rod 633 inserted in the insertion hole 632, thereby preventing the hollow protective plate 61 from moving during use. The notch 638 allows the rolling assembly 66 to pass through the upright plate 631, thereby improving the left and right movement position of the hollow protective plate 61.

[0050] See Figure 6 , Figure 7 The holding part 636 includes a holding frame 6361, whose two bottom ends are respectively connected to two limiting holes 635; a positioning hole 6362 is opened in the middle of the holding frame 6361, and a locking button 6363 is inserted into the inner cavity of the positioning hole 6362; a screw hole 637 is opened in the middle of the top surface of the upright plate 631, and the bottom end of the locking button 6363 is rotatably connected to the inner cavity of the screw hole 637; through the holding frame 6361 in the holding part 636, both ends of the holding frame 6361 can be inserted into the inner cavity of the two limiting holes 635 respectively, and the locking button 6363 can be inserted and installed through the positioning hole 6362. Then, the bottom end of the locking button 6363 is rotatably installed in the screw hole 637, thereby fixing the screw hole 637, so that the holding frame 6361 can fix the adjusting rod 633 in the insertion hole 632, ensuring the stability of the adjusting rod 633 in use.

[0051] See Figure 2 , Figure 8 The positioning component 64 includes a connecting rod 641. The bottom end of the connecting rod 641 is connected to the outer wall of the lifting plate 62 through a fixing plate 642. The top end of the connecting rod 641 is provided with a shaped slider 643. The top surface of the crossbeam 4 is provided with a shaped groove for sliding connection of the shaped slider 643. Through the connecting rod 641 in the positioning component 64, it can be connected to the outer wall of the lifting plate 62 through the fixing plate 642, and it can also be connected to the shaped groove on the top surface of the crossbeam 4 through the shaped slider 643, thereby improving the stability of the lifting plate 62 when it moves left and right with the hollow guard plate 61.

[0052] See Figure 8 The shape of the irregular groove is adapted to the shape of the irregular slider 643, and the two form an embedded structure, which allows the irregular slider 643 to slide smoothly in the inner cavity of the irregular groove.

[0053] See Figure 3 , Figure 9 The rolling assembly 66 includes a support plate 661 located at the lower middle part of the outer wall of the hollow protective plate 61. A wheel 662 is provided on the bottom surface of the support plate 661, and the bottom end of the wheel 662 is rolledly connected to the top surface of the trolley 1. The support plate 661 in the rolling assembly 66 can be fixed to the outer wall of the hollow protective plate 61 and the wheel 662 can be installed. The wheel 662 lifts the hollow protective plate 61, which makes it convenient for the staff to move the hollow protective plate 61 when it is moved.

[0054] In use: The trolley 1 provides space for opening the through hole 2 and can also install and fix the four hydraulic rods 3. Then, the four hydraulic rods 3 can be used to install the drilling mechanism 5 and adjust its position via the crossbeam 4, so that the bottom end of the drilling mechanism 5 can easily penetrate the through hole 2 to drill for coal mine geology, thus making it easier for workers to obtain coal mine geological materials. The two shielding mechanisms 6 can be installed on the top surface of the trolley 1 to protect the drilling mechanism 5. By adjusting the distance between the two shielding mechanisms 6, the drilled material can be easily discharged, so as not to affect the equipment's geological exploration, and to prevent the material drilled by the drilling mechanism 5 from splashing, thus ensuring the safety of the workers during drilling.

[0055] The motor 51 in the drilling mechanism 5 can be installed on the top surface of the crossbeam 4 and can also be installed on the drill rod 53 via the coupling 52, so that the motor 51 can drive the drill rod 53 to rotate, thereby enabling the drill rod 53 to drill into the geology.

[0056] The support component 63 in the shielding mechanism 6 can be installed on one side of the top surface of the trolley 1, and the hollow protective plate 61 can also be installed. Simultaneously, the position of the hollow protective plate 61 can be adjusted, allowing workers to easily move it closer to or further away from the drill rod 53. The hollow protective plate 61 can also be used to insert and install the lifting plate 62, facilitating its lifting within the cavity, and can also form a protective cover to prevent material from the drill rod 53 from splashing out, ensuring the safety of the drilling workers. Because the outer wall of the lifting plate 62 is close to the top... A positioning component 64 is provided, and the top of the positioning component 64 is slidably connected to the bottom surface of the crossbeam 4. Therefore, the positioning component 64 can both lift the lifting plate 62 and not affect the adjustment of the position of the lifting plate 62 with the hollow guard plate 61. The rolling component 66 can both lift the hollow guard plate 61 and roll on the top surface of the trolley 1, so that the staff can easily pull and adjust the position of the hollow guard plate 61. The handle 65 can make it easy for the user to pull the hollow guard plate 61 to move it left and right, so as to adjust the position of the hollow guard plate 61.

[0057] The upright plate 631 in the support assembly 63 can be fixed to the top surface of the trolley 1 and provide space for the insertion hole 632 and the limiting hole 635. The adjusting rod 633 can be inserted and installed through the insertion hole 632, so that the adjusting rod 633 can move easily within the insertion hole 632. At the same time, since one end of the adjusting rod 633 is connected to the outer wall surface of the hollow guard plate 61 through the support plate 634, the adjusting rod 633 can limit the movement of the hollow guard plate 61, thereby improving the stability of the hollow guard plate 61 during use. The pressing part 636 can cooperate with the limiting hole 635 to limit the adjusting rod 633 inserted in the insertion hole 632, thereby preventing the hollow guard plate 61 from moving during use. The notch 638 allows the rolling assembly 66 to pass through the upright plate 631, thereby improving the left and right movement position of the hollow guard plate 61.

[0058] The pressure frame 6361 in the pressing part 636 allows its two ends to be inserted into the inner cavities of the two limiting holes 635 respectively, and can also be inserted into the locking button 6363 through the positioning hole 6362. Then, the bottom end of the locking button 6363 is rotated and installed in the screw hole 637, thereby fixing the screw hole 637. This allows the pressure frame 6361 to fix the adjusting rod 633 in the insertion hole 632, ensuring the stability of the adjusting rod 633 in use. Through the connecting rod 641 in the positioning assembly 64, it can... The fixed plate 642 is connected to the outer wall of the lifting plate 62, and can also be connected to the irregular sliding groove opened on the top surface of the crossbeam 4 via the irregular slider 643, thereby improving the stability of the lifting plate 62 when it moves left and right with the hollow guard plate 61; through the support plate 661 in the rolling assembly 66, it can be fixed to the outer wall of the hollow guard plate 61, and the wheels 662 can be installed. Then, the hollow guard plate 61 is lifted by the wheels 662, which makes it convenient for the staff to move the hollow guard plate 61 when it moves.

[0059] The above are merely preferred embodiments of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concept, should be covered within the scope of protection of the present invention.

Claims

1. A coal mine geological drilling device, comprising a trolley (1), wherein a through hole (2) is provided in the middle of the trolley (1), and hydraulic rods (3) are provided at the four corners of the top surface of the trolley (1), the output ends of the four hydraulic rods (3) being connected by a crossbeam (4), characterized in that: Also includes: Drilling mechanism (5), the drilling mechanism (5) is located directly above the through hole (2), the drilling mechanism (5) is fixedly connected to the crossbeam (4), and the drilling mechanism (5) is used to drill for coal mine geology; as well as There are two shielding mechanisms (6), which are respectively located on both sides of the drilling mechanism (5). The middle part of the outer wall of the two shielding mechanisms (6) is connected to the top surface of the trolley (1), and the outer wall of the shielding mechanism (6) near the top is slidably connected to the bottom surface of the crossbeam (4). The shielding mechanism (6) is used to shield and protect the drilling mechanism (5). The drilling mechanism (5) includes a motor (51) located in the middle of the top surface of the crossbeam (4) and a drill rod (53) located directly above the through hole (2). The top end of the drill rod (53) is connected to the output end of the motor (51) via a coupling (52). The shielding mechanism (6) includes a hollow protective plate (61), a lifting plate (62) is inserted into the top of the hollow protective plate (61), a support component (63) is provided in the middle of the outer wall of the hollow protective plate (61), and the bottom end of the support component (63) is connected to the top surface of the trolley (1). A positioning component (64) is provided on the outer wall of the lifting plate (62) near the top, and the top of the positioning component (64) is slidably connected to the bottom surface of the crossbeam (4); A rolling assembly (66) is provided on the outer wall of the hollow protective plate (61) near the bottom end, and the bottom surface of the rolling assembly (66) is in rolling connection with the top surface of the trolley (1); The top-view inner cavity shape of the hollow guard plate (61) is the same as the top-view shape of the lifting plate (62), and the two form an embedded structure. Both the hollow guard plate (61) and the lifting plate (62) are semi-circular. The shielding mechanism (6) also includes a handle (65), which is located in the middle and upper part of the outer wall of the hollow protective plate (61). The handle (65) is used to facilitate the user to pull the hollow protective plate (61) to move left and right. The support assembly (63) includes a vertical plate (631) disposed on one side of the top surface of the trolley (1). Insertion holes (632) are provided on both sides of one side wall of the vertical plate (631) near the top. An adjustment rod (633) is inserted into the inner cavity of each insertion hole (632). One end of the two adjustment rods (633) is connected to the outer wall surface of the hollow protective plate (61) through a support plate (634). The top surface of the upright plate (631) has limit holes (635) on both sides, and the limit hole (635) and the insertion hole (632) on the same side are connected in a conductive manner. A pressing part (636) is provided on the top of the upright plate (631), and the bottom surface of the pressing part (636) is respectively connected to the two limit holes (635). The bottom center of the upright plate (631) has a notch (638). The pressing part (636) includes a pressing frame (6361), and the two bottom ends of the pressing frame (6361) are respectively inserted and connected to the two limiting holes (635); The pressure frame (6361) has a positioning hole (6362) in the middle, and a locking button (6363) is inserted into the inner cavity of the positioning hole (6362). The top surface of the upright plate (631) has a screw hole (637) in the middle, and the bottom end of the locking button (6363) is rotatably connected to the inner cavity of the screw hole (637). The positioning component (64) includes a connecting rod (641), the bottom end of which is connected to the outer wall of the lifting plate (62) through a fixing plate (642), and the top end of the connecting rod (641) is provided with a shaped slider (643). The top surface of the crossbeam (4) is provided with a shaped groove for sliding connection of the shaped slider (643). The shape of the irregular groove is adapted to the shape of the irregular slider (643), and the two form an embedded structure; The rolling assembly (66) includes a support plate (661) disposed at a lower position in the middle of the outer wall of the hollow guard plate (61), and a wheel (662) disposed on the bottom surface of the support plate (661), the bottom end of the wheel (662) being rolledly connected to the top surface of the trolley (1).

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