A high-precision box-type slow cooling furnace for optical glass production

Abstract

The present invention discloses a high-precision box-type slow cooling furnace for optical glass production, specifically relates to the field of glass production technology, including a slow cooling furnace, the lower surface of the slow cooling furnace is fixedly connected to the upper surfaces of a plurality of support legs, the opposite surfaces of the corresponding two support legs are respectively fixedly connected to the left and right sides of a temperature control box through fixed rods, and the upper surface of the temperature control box is fixedly connected to the lower surface of a water tank. The present invention sets a first conduit, a connecting shell, a rotating blade, a transmission gear, a tooth plate and a sealing plate. When the sealing plate seals the discharge head on one side, the discharge head on the other side will be in a connected state, thereby discharging gas outward, and so on, to achieve the effect of repeatedly switching the exhaust position of the discharge head, so that the slow cooling furnace can repeatedly switch the heating direction during operation, avoiding uneven heating of the optical glass during the processing, thereby ensuring the processing quality of the optical glass.

Description

Technical Field

[0001] The invention relates to the technical field of glass production, and more specifically to a high-precision box-type slow cooling furnace for optical glass production. Background Art

[0002] Glass that can change the propagation direction of light and the relative spectral distribution of ultraviolet, visible or infrared light. Optical glass in a narrow sense refers to colorless optical glass. Optical glass in a broad sense also includes colored optical glass, laser glass, quartz optical glass, radiation-resistant glass, ultraviolet infrared optical glass, fiber optical glass, acousto-optic glass, magneto-optical glass and photochromic glass. Optical glass can be used to manufacture lenses, prisms, reflectors and windows in optical instruments. Components made of optical glass are key components in optical instruments.

[0003] After the glass is pressed by the pressing device, if the glass is directly placed in a room temperature or low temperature environment for cooling after pressing, the pressed glass will be deformed, thus affecting the quality of the final processed product. In the prior art, the slow cooling furnace is a box-type structure, with a heating resistor wire arranged on the inner wall of the box, and a feeding port and a discharging port opened at both ends of the box. After the glass is pressed, it needs to be collected quickly, and the heating device of most slow cooling furnaces is often installed on one side of the slow cooling furnace, resulting in uneven heating of the internal optical glass during actual use, thereby affecting the processing quality of the optical glass. At the same time, it is often difficult to achieve the effect of heat recovery of the slow cooling furnace during the heating process, resulting in serious heat energy loss, which limits the actual use effect of the slow cooling furnace and causes waste of resources. Summary of the invention

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a high-precision box-type slow cooling furnace for optical glass production. The technical problem to be solved by the present invention is: at present, the heating devices of most slow cooling furnaces are often installed on one side of the slow cooling furnace, resulting in uneven heating of the internal optical glass during actual use, thereby affecting the processing quality of the optical glass. At the same time, it is often difficult to achieve the effect of heat recovery of the slow cooling furnace during the heating process, resulting in serious heat energy loss, which limits the actual use effect of the slow cooling furnace and easily causes the problem of waste of resources.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a high-precision box-type slow cooling furnace for optical glass production, comprising a slow cooling furnace, the lower surface of the slow cooling furnace is fixedly connected to the upper surfaces of a plurality of supporting legs, the corresponding opposite surfaces of the two supporting legs are fixedly connected to the left and right side surfaces of the temperature control box through fixing rods, the upper surface of the temperature control box is fixedly connected to the lower surface of the water tank, the left and right side surfaces of the temperature control box are respectively connected to one end of the opposite surfaces of a plurality of first guide tubes, the other ends of the corresponding two first guide tubes are respectively connected to the left and right ends of two tees, the bottom end of the tee is fixedly connected to the upper surface of the slow cooling furnace, the bottom end of the tee is connected to the top end of the second guide tube, the bottom end of the second guide tube passes through the slow cooling furnace and is connected to the upper surface of the connecting shell, the front and back sides of the inner wall of the connecting shell are both clamped with first bearings, corresponding to the two first shafts The same connecting rotating rod is sleeved in the socket, and a plurality of rotating blades are fixedly connected to the outer surface of the connecting rotating rod, the left and right ends of the connecting shell are respectively connected to one end of the opposite surface of the two third conduits, and the other ends of the corresponding two third conduits are respectively connected to one end of the opposite surface of the two connecting elbows, the bottom end of the connecting elbow is connected to the upper surface of the discharge head, the outer surface of the connecting rotating rod is fixedly connected to the inner wall of the transmission gear, one end of the back side of the connecting rotating rod is fixedly connected to one end of the front side of the rotating device, the rotating device is clamped on the front side of the fixed plate, the upper surface of the fixed plate is fixedly connected to the upper surface of the inner wall of the slow cooling furnace, the outer surface of the transmission gear is meshed with the lower surface of the tooth plate, the upper surface of the tooth plate is fixedly connected to a limiting slider, the limiting slider is slidably connected to the limiting slide groove, and a plurality of limiting slide grooves are all opened on the upper surface of the inner wall of the slow cooling furnace;

[0006] The front side of the tooth plate is fixedly connected to the back side of the connecting plate, and the lower surfaces of several connecting plates are fixedly connected with sealing plates, the upper surface of the sealing plate overlaps the lower surface of the discharge head located on the left side, and the shape of the limiting slider and the shape of the cross-section of the limiting slide groove are both set to be T-shaped.

[0007] As a further solution of the present invention: a plurality of first flow guide pipes are fixedly connected to the left and right sides of the water tank, the other end of the first flow guide pipe is connected to the bottom end of the second flow guide pipe, and the second flow guide pipe is connected to the water tank through the first flow guide pipe.

[0008] As a further solution of the present invention: the other end of the second guide pipe is connected to the bottom end of the connecting pipe, and the other ends of the corresponding two connecting pipes are respectively connected to the left and right ends of the same circulation pipe, and the lower surface of the circulation pipe is fixedly connected to the upper surfaces of several heat sinks.

[0009] As a further solution of the present invention: a temperature controller is arranged on the upper surface of the water tank, a water pump is arranged in the water tank, and the lower surfaces of a plurality of heat sinks are fixedly connected to the upper surface of the slow cooling furnace.

[0010] As a further solution of the present invention: a pressure assembly is provided on the back of the temperature control box, the pressure assembly is connected to the temperature control box, a cleaning box is slidably connected inside the temperature control box, the cleaning box is slidably connected to the back of the temperature control box, and a plurality of dust suction pipes are fixedly connected to the left and right sides of the temperature control box, the other ends of the plurality of dust suction pipes on the same side are connected to the upper surface of the same sealing cover, and the sealing cover is at the same level as the temperature control box and the supporting legs.

[0011] As a further solution of the present invention: a handle is fixedly connected to the front of the cleaning box, the inner wall of the cleaning box is fixedly connected to the outer surfaces of a plurality of filter screens, and a plurality of through holes are opened on the outer surface of the cleaning box.

[0012] As a further solution of the present invention: the rotating device includes a second bearing, the second bearing is clamped on the front side of the fixed plate, a rotating shaft is sleeved in the second bearing, and one end of the rotating shaft on the front side is fixedly connected to one end on the back side of the connecting rod.

[0013] The beneficial effects of the present invention are:

[0014] 1. The present invention provides a first conduit, a connecting shell, a rotating blade, a transmission gear, a tooth plate and a sealing plate. After the gas enters the slow cooling furnace, it will be in a high temperature state under the action of the heating element inside the temperature control box. At this time, the high temperature gas will be discharged along a discharge head. Since the high temperature gas is only discharged through the third conduit on one side at a time, when the gas is discharged along the third conduit on one side, the rotating blade will also drive the transmission gear to rotate under the push of the gas, so that the transmission gear drives the tooth plate and the sealing plate to move horizontally to the other side along the limiting slide groove. With the movement of the sealing plate, when the sealing plate seals the discharge head on one side, the discharge head on the other side will be in a connected state, thereby discharging gas outward, and so on and so forth, achieving the effect of repeatedly switching the exhaust position of the discharge head, so that the slow cooling furnace can repeatedly switch the heating direction during operation, avoiding the situation that the optical glass is heated unevenly during the processing, thereby ensuring the processing quality of the optical glass;

[0015] 2. The present invention is provided with a water tank, a slow cooling furnace, a circulation pipe and a heat sink. When the slow cooling furnace is in operation, the water pump in the water tank needs to be started, so that the water pump injects the water into the circulation pipe through the first guide pipe and the second guide pipe on one side, and circulates to the water tank again along the second guide pipe and the first guide pipe on the other side, so that when the processed optical glass needs to be taken out, the surface temperature of the heat sink can be absorbed by the liquid in the circulation pipe, thereby accelerating the cooling speed of the slow cooling furnace, avoiding the situation that the optical glass is difficult to take out due to excessive temperature, and absorbing the high temperature in the slow cooling furnace by liquid contact, and transferring the temperature to the heat sink again by contact in subsequent processing, so as to achieve the effect of heat recovery and utilization, reduce the heat loss, and ensure the actual use effect of the slow cooling furnace;

[0016] 3. The present invention provides a filter screen and a through hole so that when the pressure component is in operation, the heat inside the slow cooling furnace can be supplemented by extracting outside air, and impurities contained in the outside air can be filtered while supplementing, so as to avoid affecting the processing effect of the optical glass due to the adhesion of impurities, and at the same time, the environment inside and around the slow cooling furnace is protected. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0018] Figure 2 It is a three-dimensional structural schematic diagram of the slow cooling furnace of the present invention;

[0019] Figure 3 It is a schematic diagram of the three-dimensional cross-sectional structure of the slow cooling furnace of the present invention;

[0020] Figure 4 It is a schematic cross-sectional structure diagram of a three-dimensional connecting shell of the present invention;

[0021] Figure 5 It is a three-dimensional structural schematic diagram of the water tank of the present invention;

[0022] Figure 6 This is a schematic diagram of the structure of the cleaning box of the present invention;

[0023] In the figure: 1 slow cooling furnace, 2 supporting legs, 3 temperature control box, 4 water tank, 5 first conduit, 6 tee, 7 second conduit, 8 connecting shell, 9 first bearing, 10 connecting rotating rod, 11 rotating blade, 12 third conduit, 13 connecting elbow, 14 discharge head, 15 transmission gear, 16 rotating device, 161 rotating shaft, 162 second bearing, 17 fixing plate, 18 tooth plate, 19 limiting slider, 20 limiting slide groove, 21 sealing plate, 22 connecting plate, 23 first guide pipe, 24 second guide pipe, 25 connecting pipe, 26 circulation pipe, 27 temperature controller, 28 heat sink, 29 cleaning box, 30 pressure assembly, 31 dust suction pipe, 32 sealing cover, 33 filter screen, 34 through hole. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] like Figure 1-6As shown, the present invention provides a high-precision box-type slow cooling furnace for optical glass production, including a slow cooling furnace 1, the lower surface of the slow cooling furnace 1 is fixedly connected to the upper surfaces of a plurality of support legs 2, the opposite surfaces of the corresponding two support legs 2 are respectively fixedly connected to the left and right side surfaces of a temperature control box 3 through fixing rods, the upper surface of the temperature control box 3 is fixedly connected to the lower surface of a water tank 4, the left and right side surfaces of the temperature control box 3 are respectively connected to one end of the opposite surfaces of a plurality of first conduits 5, the other ends of the corresponding two first conduits 5 are respectively connected to the left and right ends of two tees 6, the bottom end of the tees 6 is connected to the upper surface of the slow cooling furnace 1 The surface is fixedly connected, the bottom end of the tee 6 is connected to the top end of the second conduit 7, the bottom end of the second conduit 7 passes through the slow cooling furnace 1 and is connected to the upper surface of the connecting shell 8, the front and back of the inner wall of the connecting shell 8 are clamped with the first bearing 9, the corresponding two first bearings 9 are sleeved with the same connecting rod 10, and the outer surface of the connecting rod 10 is fixedly connected with a plurality of rotating blades 11, the left and right ends of the connecting shell 8 are respectively connected to one end of the opposite surface of the two third conduits 12, and the other end of the corresponding two third conduits 12 is respectively connected to one end of the opposite surface of the two connecting elbows 13. The bottom end of the connecting elbow 13 is connected to the upper surface of the discharge head 14, the outer surface of the connecting rotating rod 10 is fixedly connected to the inner wall of the transmission gear 15, one end of the back of the connecting rotating rod 10 is fixedly connected to one end of the front of the rotating device 16, the rotating device 16 is clamped on the front of the fixed plate 17, the upper surface of the fixed plate 17 is fixedly connected to the upper surface of the inner wall of the slow cooling furnace 1, the outer surface of the transmission gear 15 is meshed with the lower surface of the tooth plate 18, the upper surface of the tooth plate 18 is fixedly connected to the limit slider 19, the limit slider 19 is slidably connected to the limit slide 20, and a plurality of limit slides 20 are open It is arranged on the upper surface of the inner wall of the slow cooling furnace 1, and by arranging the first conduit 5, the connecting shell 8, the rotating blade 11, the transmission gear 15, the tooth plate 18 and the sealing plate 21, when the sealing plate 21 seals the discharge head 14 on one side, the discharge head 14 on the other side will be in a connected state, thereby discharging gas outward, and so on, to achieve the effect of repeatedly switching the exhaust position of the discharge head 14, so that the slow cooling furnace can repeatedly switch the heating direction during operation, avoid uneven heating of the optical glass during the processing, and thus play an effect of ensuring the processing quality of the optical glass.

[0026] like Figure 1 , Figure 3 and Figure 5As shown, the front side of the tooth plate 18 is fixedly connected to the back side of the connecting plate 22, and the lower surfaces of several connecting plates 22 are fixedly connected with sealing plates 21, and the upper surface of the sealing plate 21 overlaps with the lower surface of the discharge head 14 located on the left side. Due to the provision of a limiting slider 19 and a limiting slide groove 20, the limiting slider 19 can limit the moving direction of the sealing plate 21 and the tooth plate 18, so as to avoid the incomplete covering of the discharge head 14 due to the misalignment of the tooth plate 18 or the sealing plate 21 during use. At the same time, it reduces the situation that the tooth plate 18 and the transmission gear 15 are separated, and the stability of the slow cooling furnace during operation is guaranteed. The shape of the limiting slider 19 and the shape of the cross section of the limiting slide groove 20 are both set to T-shaped. Several first guide pipes 23 are fixedly connected to the left and right sides of the water tank 4. The other end of the first guide pipe 23 is connected to the bottom end of the second guide pipe 24, and the second guide pipe 24 is connected to the water tank 4 through the first guide pipe 23.

[0027] like Figure 2 , Figure 3 and Figure 5 As shown, the other end of the second guide tube 24 is connected to the bottom end of the connecting tube 25, and the other ends of the corresponding two connecting tubes 25 are respectively connected to the left and right ends of the same circulation tube 26. The lower surface of the circulation tube 26 is fixedly connected to the upper surfaces of a plurality of heat sinks 28. A thermostat 27 is provided on the upper surface of the water tank 4, and a water pump is provided in the water tank 4. The lower surfaces of the plurality of heat sinks 28 are fixedly connected to the upper surface of the slow cooling furnace 1. A pressure assembly 30 is provided on the back of the temperature control box 3. Because the circulation tube 26 and the heat sink 28 are provided, the surface temperature of the heat sink 28 is absorbed by the liquid in the circulation tube 26, thereby accelerating the cooling speed of the slow cooling furnace 1, and avoiding the difficulty in taking out the optical fiber due to excessive temperature. The situation of glass occurs, and the high temperature in the slow cooling furnace 1 can be absorbed by liquid contact, and the temperature can be transferred to the heat sink 28 again by contact during subsequent processing, so as to achieve the effect of heat recovery and utilization, reduce heat loss, and ensure the actual use effect of the slow cooling furnace. The pressure component 30 is connected to the temperature control box 3, and a cleaning box 29 is slidably connected inside the temperature control box 3. The cleaning box 29 is slidably connected to the back of the temperature control box 3. Several dust suction pipes 31 are fixedly connected to the left and right sides of the temperature control box 3. The other ends of the several dust suction pipes 31 on the same side are connected to the upper surface of the same sealing cover 32, and the sealing cover 32 is at the same level as the temperature control box 3 and the support leg 2.

[0028] like Figure 1 , Figure 4 and Figure 6As shown, a handle is fixedly connected to the front of the cleaning box 29, and the inner wall of the cleaning box 29 is fixedly connected to the outer surface of several filter screens 33. The outer surface of the cleaning box 29 is provided with several through holes 34. The rotating device 16 includes a second bearing 162. The filter screen 33 and the through holes 34 are arranged so that when the pressure component 30 is in operation, the heat inside the slow cooling furnace 1 can be supplemented by extracting outside air, and the impurities contained in the outside air can be filtered at the same time to avoid affecting the processing effect of the optical glass due to the adhesion of impurities, and at the same time, the environment inside and around the slow cooling furnace 1 is protected. The second bearing 162 is clamped on the front of the fixed plate 17, and a rotating shaft 161 is sleeved in the second bearing 162. One end of the rotating shaft 161 on the front is fixedly connected to one end on the back of the connecting rotating rod 10.

[0029] The working principle of the present invention is as follows: the optical glass to be processed is sequentially placed in the slow cooling furnace 1, the sealing plates 21 on both sides of the slow cooling furnace 1 are closed, the pressure assembly 30 and the heating elements inside the slow cooling furnace 1 are turned on, and when the pressure assembly 30 is running, the pressure assembly 30 will discharge the gas into the temperature control box 3 through the air inlet on the back thereof, and after being filtered through the filter screen 33 and the through hole 34, the gas will enter the connecting shell 8 along the first conduit 5 and the tee 6, thereby accelerating the air circulation inside the slow cooling furnace 1, and after entering the slow cooling furnace 1, the gas will be in a high temperature state under the action of the heating elements inside the temperature control box 3, at this time, the high temperature gas will be discharged along one discharge head 14, and because it will only pass through the third conduit on one side at a time, The tube 12 discharges high-temperature gas, so that when the gas is discharged along the third conduit 12 on one side, the rotating blade 11 will also drive the transmission gear 15 to rotate under the push of the gas, so that the transmission gear 15 drives the tooth plate 18 and the sealing plate 21 to translate to the other side along the limiting slide groove 20. As the sealing plate 21 moves, when the sealing plate 21 seals the discharge head 14 on one side, the discharge head 14 on the other side will be in a connected state, thereby discharging gas outward, and so on. When the slow cooling furnace is running, the water pump in the water tank 4 needs to be started, so that the water pump is injected into the circulation pipe 26 through the first guide pipe 23 and the second guide pipe 24 on one side, and circulates to the water tank 4 again along the second guide pipe 24 and the first guide pipe 23 on the other side.

[0030] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change;

[0031] Secondly: In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

[0032] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-precision box-type slow cooling furnace for optical glass production, comprising a slow cooling furnace (1), characterized in that: The lower surface of the slow cooling furnace (1) is fixedly connected to the upper surfaces of the plurality of support legs (2), and the opposite surfaces of the corresponding two support legs (2) are respectively fixedly connected to the left and right side surfaces of the temperature control box (3) through fixing rods. The upper surface of the temperature control box (3) is fixedly connected to the lower surface of the water tank (4). The left and right side surfaces of the temperature control box (3) are respectively connected to one end of the opposite surfaces of the plurality of first conduits (5), and the other ends of the corresponding two first conduits (5) are respectively connected to the left and right ends of the two tees (6). The bottom end of the tee (6) is fixedly connected to the upper surface of the slow cooling furnace (1), the bottom end of the tee (6) is connected to the top end of the second conduit (7), the bottom end of the second conduit (7) passes through the slow cooling furnace (1) and is connected to the upper surface of the connecting shell (8), the front and back sides of the inner wall of the connecting shell (8) are both clamped with first bearings (9), the same connecting rotating rod (10) is sleeved in the corresponding two first bearings (9), and the outer surface of the connecting rotating rod (10) is fixedly connected to a plurality of rotating blades (11); The left and right ends of the connecting shell (8) are respectively connected to one end of the opposite surface of the two third conduits (12), and the other ends of the corresponding two third conduits (12) are respectively connected to one end of the opposite surface of the two connecting elbows (13), and the bottom end of the connecting elbow (13) is connected to the upper surface of the discharge head (14). The outer surface of the connecting rotating rod (10) is fixedly connected to the inner wall of the transmission gear (15), and one end of the back side of the connecting rotating rod (10) is fixedly connected to one end of the front side of the rotating device (16). The rotating device (16) is fixedly connected to the front of the fixed plate (17), the upper surface of the fixed plate (17) is fixedly connected to the upper surface of the inner wall of the slow cooling furnace (1), the outer surface of the transmission gear (15) is meshed with the lower surface of the tooth plate (18), the upper surface of the tooth plate (18) is fixedly connected to a limiting slider (19), the limiting slider (19) is slidably connected to a limiting slide groove (20), and a plurality of limiting slide grooves (20) are all provided on the upper surface of the inner wall of the slow cooling furnace (1); The front surface of the tooth plate (18) is fixedly connected to the back surface of the connecting plate (22), and the lower surfaces of several connecting plates (22) are fixedly connected to sealing plates (21), the upper surface of the sealing plate (21) overlaps the lower surface of the discharge head (14) located on the left side, and the shape of the limiting sliding block (19) and the shape of the cross section of the limiting sliding groove (20) are both set to be T-shaped.

2. The high-precision box-type slow cooling furnace for optical glass production according to claim 1, characterized in that: A plurality of first flow guide pipes (23) are fixedly connected to the left and right sides of the water tank (4); the other ends of the first flow guide pipes (23) are connected to the bottom ends of the second flow guide pipes (24); and the second flow guide pipes (24) are connected to the water tank (4) via the first flow guide pipes (23).

3. The high-precision box-type slow cooling furnace for optical glass production according to claim 2, characterized in that: The other end of the second flow guide pipe (24) is connected to the bottom end of the connecting pipe (25), and the other ends of the corresponding two connecting pipes (25) are respectively connected to the left and right ends of the same circulation pipe (26), and the lower surface of the circulation pipe (26) is fixedly connected to the upper surfaces of a plurality of heat sinks (28).

4. The high-precision box-type slow cooling furnace for optical glass production according to claim 3, characterized in that: A temperature controller (27) is provided on the upper surface of the water tank (4), a water pump is provided in the water tank (4), and the lower surfaces of a plurality of heat sinks (28) are fixedly connected to the upper surface of the slow cooling furnace (1).

5. The high-precision box-type slow cooling furnace for optical glass production according to claim 1, characterized in that: A pressure assembly (30) is provided on the back of the temperature control box (3), the pressure assembly (30) is connected to the temperature control box (3), a cleaning box (29) is slidably connected inside the temperature control box (3), the cleaning box (29) is slidably connected to the back of the temperature control box (3), a plurality of dust suction pipes (31) are fixedly connected to the left and right sides of the temperature control box (3), the other ends of the plurality of dust suction pipes (31) located on the same side are connected to the upper surface of the same sealing cover (32), and the sealing cover (32) is at the same level as the temperature control box (3) and the supporting leg (2).

6. The high-precision box-type slow cooling furnace for optical glass production according to claim 5, characterized in that: A handle is fixedly connected to the front of the cleaning box (29); the inner wall of the cleaning box (29) is fixedly connected to the outer surfaces of a plurality of filter screens (33); and a plurality of through holes (34) are formed on the outer surface of the cleaning box (29).

7. The high-precision box-type slow cooling furnace for optical glass production according to claim 1, characterized in that: The rotating device (16) comprises a second bearing (162), the second bearing (162) being clamped on the front side of the fixing plate (17), a rotating shaft (161) being sleeved inside the second bearing (162), and one end of the rotating shaft (161) on the front side being fixedly connected to one end of the rear side of the connecting rotating rod (10).

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