Automatic piston ring installation machine

Abstract

The present invention relates to a technical field of piston ring installation equipment, and specifically to an automatic piston ring installation machine, comprising the above-mentioned installation frame, wherein the top surface of the installation frame is provided with a protective cover plate, two supporting base plates are symmetrically provided in the installation frame, a piston ring pushing device is provided on one side of the supporting base plate, a piston ring sleeve device is provided on the other side of the supporting base plate, and a piston ring positioning device is provided between the piston ring pushing device and the piston ring sleeve device; the present invention provides an automatic piston ring installation machine which is cleverly designed, easy to use, simple to operate, highly automated, safe and reliable, and has high efficiency in installing piston rings, takes PLC as the main control core, and meets the needs of workers and enterprises, so that the present invention has broad market prospects.

Description

Technical Field

[0001] The invention relates to the technical field of piston ring installation equipment, and in particular to an automatic piston ring installation machine. Background Art

[0002] The piston is an important part of the engine. Generally speaking, two piston rings need to be installed on the piston. At present, the installation of the piston rings is completed by workers manually, and the models and specifications of the two piston rings are often different. Workers are prone to confuse the two different piston rings when installing the piston rings. The piston rings need to be distinguished between the front and back sides. Workers are prone to install the piston rings upside down. In addition, the elasticity of the material of the piston ring is poor. Workers are prone to break the piston rings when manually installing them, resulting in waste of the piston rings. In addition, workers manually installing the piston rings is inefficient, time-consuming and labor-intensive.

[0003] Therefore, it is of great market prospect to produce an automatic piston ring installation machine which is ingeniously designed, easy to use, simple to operate, highly automated, safe and reliable, and highly efficient in installing piston rings, with PLC as the main control core. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides an automatic piston ring installation machine with PLC as the main control core, which is cleverly designed, easy to use, simple to operate, highly automated, safe and reliable, and highly efficient in installing piston rings, and is used to overcome the defects in the prior art.

[0005] The technical solution adopted by the present invention is: an automatic piston ring installation machine, comprising the above-mentioned installation frame, a protective cover plate is provided on the top surface of the installation frame, two supporting base plates are symmetrically provided in the installation frame, a piston ring pushing device is provided on one side of the supporting base plate, a piston ring set device is provided on the other side of the supporting base plate, a piston ring positioning device is provided between the piston ring pushing device and the piston ring set device, two piston ring pushing devices, two piston ring set devices and two piston ring positioning devices are used, a base plate support plate is provided under the supporting base plate, and the two supporting base plates are fixed to the installation frame through the base plate support plate; a guide rail groove is provided on one side of the supporting base plate, and an installation groove is provided on the other side of the supporting base plate, the guide rail groove is opened along one side of the supporting base plate to the installation groove, and the bottom surface of the installation groove and the bottom surface of the guide rail groove are located on the same horizontal plane.

[0006] The piston ring pushing device includes a circular thin-walled cylinder, which is fixedly mounted on one side of the supporting base plate. The extending rod of the circular thin-walled cylinder is located in the guide track groove. The extending rod of the circular thin-walled cylinder adopts a rod-shaped structure that performs reciprocating linear motion along the guide track groove. A piston ring slider is fixedly provided on the top of the extending rod of the circular thin-walled cylinder. The piston ring slider is located in the guide track groove. The top surface of the piston ring slider and the top surface of the supporting base plate are located on the same horizontal plane. A piston ring placement groove group is provided at one end of the piston ring slider. The piston ring placement groove group consists of a horizontal U-shaped groove and a vertical through groove. The height of the horizontal U-shaped groove is less than the height of the vertical through groove. The vertical through groove is located on the central axis of the horizontal U-shaped groove.

[0007] The piston ring set device comprises a square thin-walled cylinder, which is located below the supporting base plate and fixedly mounted on the supporting base plate. A fixed block through hole is provided on the supporting base plate, and the center of the fixed block through hole, the center of the mounting groove and the center of the square thin-walled cylinder are all located on the same vertical axis. The extending rod of the square thin-walled cylinder adopts a rod-shaped structure that reciprocates along the fixed block through hole. A piston fixed block is provided at the top of the square thin-walled cylinder, and a fixed block clamping plate is provided between the piston fixed block and the square thin-walled cylinder. The piston fixed block and the square thin-walled cylinder are fixedly connected through the fixed block clamping plate. A floating push plate is provided on the supporting base plate, and the number of the floating push plates is four. The four floating push plates are evenly distributed around the fixed block through hole. The side walls of the adjacent fixed block through holes of the floating push plate adopt an arc structure. A push plate guide groove is provided on the corresponding floating push plate of the supporting base plate. The floating push plate is located in the push plate guide groove. A push spring is provided between the bottom surface of the floating push plate and the push plate guide groove. The two ends of the push spring are respectively fixed on the bottom surface of the push plate guide groove and the floating push plate.

[0008] The piston ring positioning device includes a horizontal fixing plate, which is fixed on the supporting bottom plate. A piston ring cylinder is vertically provided on one side of the horizontal fixing plate. A vertical fixing plate is provided between the piston ring cylinder and the horizontal fixing plate. The vertical fixing plate adopts a T-shaped plate structure. The vertical fixing plate, the bottom end of the vertical fixing plate is welded and fixed to the side wall of the piston ring cylinder, and the top surface of the vertical fixing plate is fixed on the horizontal fixing plate. The horizontal fixing plate, the vertical fixing plate and the piston ring cylinder are all located above the guide track groove.

[0009] The piston fixing block adopts an inverted truncated cone structure, and a piston placement groove is provided on the top surface of the piston fixing block. The side walls of the floating push plate adjacent to the fixed block through hole form a virtual push cylinder, and the virtual push cylinder is mounted on the piston fixing block. The top surface of the floating push plate and the bottom surface of the mounting groove are located on the same horizontal plane. The aperture of the fixed block through hole is not less than the maximum diameter of the piston fixing block. The fixed block clamping plate adopts a longitudinally arranged wedge-shaped plate structure, and the inner wall width of the fixed block clamping plate is not greater than the outer wall width of the fixed block clamping plate.

[0010] The mounting frame is fixed with a PLC control box, an emergency stop button and an indicator light, and a quick button is fixed on the protective cover. The PLC control box is located on the side wall of one side of the mounting frame, the emergency stop button and the indicator light are located on the side wall of the other side of the mounting frame, and the quick button is located on the top surface of the protective cover. The PLC control box is provided with a PLC control chip and a DC switching power supply. The protective cover includes a first cover and a second cover placed horizontally, one side of the second cover is hinged and fixed to the first cover by a hinge, and the other side of the second cover is hinged and fixed to the top of the mounting frame by a hinge, and a placement hole is provided on the first cover of the protective cover.

[0011] The beneficial effects of the present invention are as follows: first, the present invention comprises an installation frame, the top surface of the installation frame is provided with a protective cover plate, two supporting bottom plates are symmetrically provided in the installation frame, a piston ring pushing device is provided on one side of the supporting bottom plate, a piston ring sleeve device is provided on the other side of the supporting bottom plate, a piston ring positioning device is provided between the piston ring pushing device and the piston ring sleeve device, a bottom plate supporting plate is provided below the supporting bottom plate, and the supporting bottom plate is fixed to the installation frame through the bottom plate supporting plate; a guide rail groove is provided on one side of the supporting bottom plate, and an installation groove is provided on the other side of the supporting bottom plate, the guide rail groove is provided along one side of the supporting bottom plate to the installation groove, the bottom surface of the installation groove and the bottom surface of the guide rail groove are located on the same horizontal plane, and the piston ring pushing device, the piston ring sleeve device and the piston ring positioning device are used to realize The demand for automatic installation of piston rings is met; secondly, the present invention is provided with a PLC control box, which controls the automatic installation of the piston ring by the PLC chip control button and the input signal of the sensor and the output signal of the solenoid valve and the indicator light; thirdly, the present invention is provided with an emergency stop button and a protective cover plate, and the more dangerous position of the present invention is protected by the protective cover plate, and the operation of the present invention can be urgently stopped by controlling the emergency stop button, so that the installation of the present invention is reliable; in addition, when the present invention is used, multiple piston rings are stacked and placed in the piston ring cylinder, and the piston is placed in the piston placement groove, so that the piston ring can be installed. It is easy to use and simple to operate, which greatly improves the work efficiency, has good social and economic benefits, and is a product that is easy to promote and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a first structural schematic diagram of the support base plate and its assembly according to the present invention.

[0013] Figure 2 This is a second structural schematic diagram of the support base plate and its assembly according to the present invention.

[0014] Figure 3 This is a first structural schematic diagram of the present invention.

[0015] Figure 4 It is a second structural schematic diagram of the present invention.

[0016] Figure 5 It is a structural schematic diagram of the supporting base plate of the present invention.

[0017] Figure 6 It is a schematic structural diagram of the piston ring slider of the present invention.

[0018] Figure 7 It is a schematic diagram of the PLC working control of the present invention. DETAILED DESCRIPTION

[0019] like Figure 1 , 2 As shown in , 3, 4, 5, 6, and 7, an automatic piston ring installation machine comprises the installation frame (1), the top surface of the installation frame (1) is provided with a protective cover plate (2), two support base plates (3) are symmetrically arranged in the installation frame (1), one side of the support base plate (3) is provided with a piston ring pushing device, the other side of the support base plate (3) is provided with a piston ring set device, a piston ring positioning device is provided between the piston ring pushing device and the piston ring set device, and two piston ring pushing devices, piston ring set devices and piston ring positioning devices are all used, a base plate support plate (4) is provided below the support base plate (3), and the two support base plates (3) are fixed to the installation frame (1) through the base plate support plate (4); one side of the support base plate (3) is provided with a guide rail groove (5), and the other side of the support base plate (3) is provided with a mounting groove (6), the guide rail groove (5) is opened along one side of the support base plate (3) to the mounting groove (6), and the bottom surface of the mounting groove (6) and the bottom surface of the guide rail groove (5) are located on the same horizontal plane.

[0020] The piston ring pushing device comprises a circular thin-walled cylinder (7), which is fixedly mounted on one side of a supporting base plate (3), and a cylinder mounting plate is provided on the circular thin-walled cylinder (7). The circular thin-walled cylinder (7) and the cylinder mounting plate are an integrally formed structure, and a bolt group is provided between the cylinder mounting plate and the supporting base plate (3). The cylinder mounting plate is fixed to the supporting base plate (3) by the bolt group. The extending rod of the circular thin-walled cylinder (7) is located in the guide track groove (5), and the extending rod of the circular thin-walled cylinder (7) adopts a rod-shaped structure that performs reciprocating linear motion along the guide track groove (5). The top of the extending rod of the circular thin-walled cylinder (7) A piston ring slider (8) is fixedly provided at the end, a bolt group is provided between the top end of the extension rod of the circular thin-walled cylinder (7) and the piston ring slider (8), the circular thin-walled cylinder (7) and the piston ring slider (8) are fixed to each other by the bolt group, the piston ring slider (8) is located in the guide track groove (5), the top surface of the piston ring slider (8) and the top surface of the supporting bottom plate (3) are located on the same horizontal plane, a piston ring placement groove group (9) is opened at one end of the piston ring slider (8), the piston ring placement groove group (9) consists of a horizontal U-shaped groove and a vertical through groove, the height of the horizontal U-shaped groove is less than the height of the vertical through groove, and the vertical through groove is located on the central axis of the horizontal U-shaped groove. The height of the horizontal U-shaped groove of the piston ring placement groove group (9) is consistent with the height of the piston ring, so that the piston ring slider (8) only pushes one piston ring in one reciprocating motion, and a ring mouth groove is opened on the piston ring, the width of the ring mouth groove is not greater than the groove width of the vertical through groove of the piston ring placement groove group (9), and the groove width of the vertical through groove of the piston ring placement groove group (9) is not less than the minimum width of the fixed block clamping plate 12, so that when the piston ring is pushed, the ring mouth groove is slowly expanded by the vertical through groove of the piston ring placement groove group (9), and the piston ring is stuck on the vertical through groove of the placement groove group (9) after it is in place, thereby preventing the piston ring from reciprocating with the piston ring slider (8).

[0021] The piston ring set device comprises a square thin-walled cylinder (10), the square thin-walled cylinder (10) is located below the supporting base plate (3), the square thin-walled cylinder (10) is fixedly mounted on the supporting base plate (3), a fixing block through hole (14) is opened on the supporting base plate (3), the center of the fixing block through hole (14), the center of the mounting groove (6) and the center of the square thin-walled cylinder (10) are all located on the same vertical axis, the extension rod of the square thin-walled cylinder (10) adopts a rod-shaped structure that reciprocates along the fixing block through hole, two cylinder vertical plates are symmetrically arranged on both sides of the square thin-walled cylinder (10), the square thin-walled cylinder (10) and the cylinder vertical plates are an integrally formed structure, a bolt group is arranged between the cylinder vertical plate and the supporting base plate (3), the cylinder vertical plate is fixed to the supporting base plate (3) by the bolt group, a piston fixing block (11) is arranged at the top of the square thin-walled cylinder (10), the piston fixing block (11) and the square thin-walled cylinder (10) are connected to the piston fixing block (11) and the piston fixing block (11) are connected to the square thin-walled cylinder (10). A fixed block clamping plate (12) is provided between the cylinder (10), the piston fixed block (11) and the square thin-walled cylinder (10) are fixedly connected through the fixed block clamping plate (12), and the fixed block clamping plate (12) is fixedly connected to the piston fixed block (11) and the square thin-walled cylinder (10) through a bolt group. A floating push plate (15) is provided on the support base plate (3), and the number of the floating push plates (15) is four. The four floating push plates (15) are evenly distributed around the fixed block through hole (14). The side walls of the adjacent fixed block through holes (14) of the floating push plates (15) adopt an arc structure. The support base plate (3) is provided with a push plate guide groove corresponding to the floating push plate (15). The floating push plate (15) is located in the push plate guide groove. A push spring (16) is provided between the bottom surface of the floating push plate (15) and the push plate guide groove. The two ends of the push spring (16) are respectively fixed to the bottom surface of the push plate guide groove and the floating push plate (15). The piston ring positioning device comprises a horizontal fixing plate (17), the horizontal fixing plate (17) is fixed on the supporting base plate (3), the horizontal fixing plate (17) is connected to the supporting base plate (3) by a bolt group, a piston ring cylinder (18) is vertically provided on one side of the horizontal fixing plate (17), a vertical fixing plate (19) is provided between the piston ring cylinder (18) and the horizontal fixing plate (17), the vertical fixing plate (19) adopts a T-shaped plate structure, the vertical fixing plate (19), the bottom end of the vertical fixing plate (19) is welded and fixed to the side wall of the piston ring cylinder (18), the top surface of the vertical fixing plate (19) is fixed on the horizontal fixing plate (17), the horizontal fixing plate (17) is connected to the vertical fixing plate (19) by a bolt group, and the horizontal fixing plate (17), the vertical fixing plate and the piston ring cylinder (18) are all located above the guide track groove (5).

[0022] The piston fixing block (11) adopts an inverted truncated cone structure, and a piston placement groove (25) is provided on the top surface of the piston fixing block. The shape of the piston placement groove (25) corresponds to the shape of the piston, and the height of the piston placement groove (25) is consistent with the height of the ring groove from the bottom surface of the piston to the piston. The side wall of the floating push plate (15) adjacent to the fixed block through hole (14) forms a virtual push cylinder, and the virtual push cylinder is sleeved on the piston fixing block (11). The top surface of the floating push plate (15) and the bottom surface of the mounting groove (6) are located on the same horizontal plane. The aperture of the fixed block through hole (14) is not less than the maximum diameter of the piston fixing block (11). The fixed block clamping plate (12) adopts a longitudinally arranged wedge-shaped plate structure, and the inner wall width of the fixed block clamping plate (12) is not greater than the outer wall width of the fixed block clamping plate (12).

[0023] The mounting frame (1) is fixedly provided with a PLC control box (20), an emergency stop button (21) and an indicator light (22); the protective cover (2) is fixedly provided with a quick button (23); the PLC control box (20) is located on a side wall on one side of the mounting frame (1); the emergency stop button (21) and the indicator light (22) are located on a side wall on the other side of the mounting frame (1); the quick button (23) is located on the top surface of the protective cover (2); a PLC control chip and a DC switch circuit are provided in the PLC control box (20); A source, sensors and solenoid valves are respectively provided on the output end and the input end of the circular thin-walled cylinder (7) and the square thin-walled cylinder (10), a PLC control chip is electrically connected to the quick button (23), the sensor, the solenoid valve, the DC switching power supply, the emergency stop button (21) and the indicator light (22), the PLC control box (20) is mounted on the frame (1) through a bolt group fixing plate, the emergency stop button (21) and the indicator light (22) are bonded to the mounting frame (1), and the quick button (23) is bonded to the protective cover plate (2). The solenoid valve is used to control the corresponding thin-walled cylinder to make reciprocating motion, the sensor is used to detect the magnetic switch status of the cylinder in place, the DC switching power supply adopts a DC 24V 2A switching power supply, the PLC chip adopts an Omron small PLC, and its internal program can be programmed by a PC using Omron PLC programming software, which is suitable for automation equipment with a small number of control points; the indicator lights (22) are two, the two indicator lights 22 are red and green respectively, the green light indicates that the device is in a normal motion state, and when the emergency stop button 21 is pressed, the red light is displayed, indicating that the device is in an inoperable state.

[0024] The protective cover plate (2) comprises a first cover plate and a second cover plate placed horizontally, one side of the second cover plate is hingedly fixed to the first cover plate by a hinge, and the other side of the second cover plate is hingedly fixed to the top of the mounting frame by a hinge, and a placement hole (24) is formed on the first cover plate of the protective cover plate (2), the placement hole (24) is sleeved on the piston ring cylinder 18, and the placement hole 24 is located above the piston fixing block (11). The bolt group comprises bolts and nuts, and the fixed connection is achieved by the matching connection of the bolts and nuts.

[0025] The method of using this product is as follows: Figure 1 , 2 , 3, 4, 5, 6, and 7, first, place the first group of piston rings with the bottom facing downwards and evenly stack them on the first piston ring cylinder (18), and place the second group of piston rings with the top facing downwards and evenly stack them on the second piston ring cylinder (18); then, place the piston with the bottom facing downwards on the first piston fixing block (11), activate the corresponding quick button (23), so that the corresponding square thin-walled cylinder (10) contracts and drives the piston to press down, so that the piston is covered with the piston ring of the first group, and according to the reciprocating motion According to the principle of reciprocating motion, the square thin-walled cylinder (10) extends upward and drives the piston to move upward, so that the piston returns to the initial position; then, the piston is placed on another piston fixing block (11) with the top of the piston facing downward, and the corresponding quick button (23) is activated to shrink the corresponding square thin-walled cylinder (10) and drive the piston to press downward, so that the piston is covered with the second set of piston rings, and according to the principle of reciprocating motion, the square thin-walled cylinder (10) extends upward and drives the piston to move upward, so that the piston returns to the initial position.

[0026] The present invention provides an automatic piston ring installation machine which is cleverly designed, easy to use, simple to operate, highly automated, safe and reliable, and highly efficient in installing piston rings. The machine takes PLC as the main control core and meets the needs of workers and enterprises, thus having broad market prospects.

Claims

1. An automatic piston ring installation machine, characterized in that: The invention comprises an installation frame (1), wherein the top surface of the installation frame (1) is provided with a protective cover plate (2), two support base plates (3) are symmetrically arranged in the installation frame (1), a piston ring pushing device is provided on one side of the support base plate (3), a piston ring set device is provided on the other side of the support base plate (3), a piston ring positioning device is provided between the piston ring pushing device and the piston ring set device, two piston ring pushing devices, two piston ring set devices and two piston ring positioning devices are used, a base plate support plate (4) is provided below the support base plate (3), and the two support base plates (3) are fixed to the installation frame (1) through the base plate support plate (4); a guide rail groove (5) is provided on one side of the support base plate (3), and a mounting groove (6) is provided on the other side of the support base plate (3), the guide rail groove (5) is provided along one side of the support base plate (3) to the mounting groove (6), and the bottom surface of the mounting groove (6) is aligned with the guide rail groove The bottom surfaces of the piston rings (5) are located on the same horizontal plane; the piston ring pushing device comprises a circular thin-walled cylinder (7), the circular thin-walled cylinder (7) is fixedly mounted on one side of the supporting bottom plate (3), the extension rod of the circular thin-walled cylinder (7) is located in the guide track groove (5), the extension rod of the circular thin-walled cylinder (7) adopts a rod-shaped structure that performs reciprocating linear motion along the guide track groove (5), a piston ring slider (8) is fixedly arranged at the top end of the extension rod of the circular thin-walled cylinder (7), the piston ring slider (8) is located in the guide track groove (5), the top surface of the piston ring slider (8) and the top surface of the supporting bottom plate (3) are located on the same horizontal plane, a piston ring placement groove group (9) is opened at one end of the piston ring slider (8), the piston ring placement groove group (9) consists of a horizontal U-shaped groove and a vertical through groove, the height of the horizontal U-shaped groove is less than the height of the vertical through groove, and the vertical through groove is located on the central axis of the horizontal U-shaped groove;The piston ring set device comprises a square thin-walled cylinder (10), the square thin-walled cylinder (10) is located below the support base plate (3), the square thin-walled cylinder (10) is fixedly mounted on the support base plate (3), a fixing block through hole (14) is provided on the support base plate (3), the center of the fixing block through hole (14), the center of the mounting groove (6) and the center of the square thin-walled cylinder (10) are all located on the same vertical axis, the extension rod of the square thin-walled cylinder (10) adopts a rod-shaped structure that reciprocates along the fixing block through hole, and the square thin-walled cylinder (10) is provided with a fixing block through hole (14). A piston fixing block (11) is provided at the top of the square thin-walled cylinder (10), a fixing block clamping plate (12) is provided between the piston fixing block (11) and the square thin-walled cylinder (10), the piston fixing block (11) and the square thin-walled cylinder (10) are fixedly connected via the fixing block clamping plate (12), a floating push plate (15) is provided on the supporting bottom plate (3), the number of the floating push plates (15) is four, the four floating push plates (15) are evenly distributed around the fixing block through hole (14), the adjacent fixing block through holes (14) of the floating push plates (15) are connected to the fixing block through holes (15) of the fixing block through holes (14 ... 4) has a side wall with an arc structure, a push plate guide groove is provided on the support bottom plate (3) corresponding to the floating push plate (15), the floating push plate (15) is located in the push plate guide groove, a push spring (16) is provided between the bottom surface of the floating push plate (15) and the push plate guide groove, and two ends of the push spring (16) are respectively fixed to the bottom surface of the push plate guide groove and the floating push plate (15); the piston ring positioning device comprises a horizontal fixing plate (17), the horizontal fixing plate (17) is fixed on the support bottom plate (3), and the horizontal fixing plate (17) A piston ring cylinder (18) is vertically provided on one side, and a vertical fixing plate (19) is provided between the piston ring cylinder (18) and the horizontal fixing plate (17). The vertical fixing plate (19) adopts a T-shaped plate structure. The bottom end of the vertical fixing plate (19) is welded and fixed to the side wall of the piston ring cylinder (18), and the top surface of the vertical fixing plate (19) is fixed to the horizontal fixing plate (17). The horizontal fixing plate (17), the vertical fixing plate and the piston ring cylinder (18) are all located above the guide track groove (5). ; 2. The automatic piston ring installation machine according to claim 1, characterized in that: The piston fixing block (11) adopts an inverted truncated cone structure, and a piston placement groove (25) is provided on the top surface of the piston fixing block. The side walls of the floating push plate (15) adjacent to the fixing block through hole (14) form a virtual push cylinder, and the virtual push cylinder is sleeved on the piston fixing block (11). The top surface of the floating push plate (15) and the bottom surface of the mounting groove (6) are located on the same horizontal plane. The aperture of the fixing block through hole (14) is not less than the maximum diameter of the piston fixing block (11). The fixing block clamping plate (12) adopts a longitudinally arranged wedge-shaped plate structure, and the inner wall width of the fixing block clamping plate (12) is not greater than the outer wall width of the fixing block clamping plate (12).

3. The automatic piston ring installation machine according to claim 1, characterized in that: A PLC control box (20), an emergency stop button (21) and an indicator light (22) are fixedly provided on the mounting frame (1); a quick button (23) is fixedly provided on the protective cover (2); the PLC control box (20) is located on a side wall on one side of the mounting frame (1); the emergency stop button (21) and the indicator light (22) are located on a side wall on the other side of the mounting frame (1); the quick button (23) is located on the top surface of the protective cover (2); and a PLC control chip and a DC switching power supply are provided in the PLC control box (20).

4. The automatic piston ring installation machine according to claim 1, characterized in that: The protective cover plate (2) comprises a first cover plate and a second cover plate placed horizontally, one side of the second cover plate is hingedly fixed to the first cover plate by a hinge, and the other side of the second cover plate is hingedly fixed to the top of the mounting frame by a hinge, and a placement hole (24) is provided on the first cover plate of the protective cover plate (2).

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