A generator with a built-in water-cooled silencer

Abstract

The present invention relates to the technical field of generators, and specifically to a generator with a built-in water-cooled silencer, comprising an assembly box, a motor provided in the assembly box, an internal combustion engine for driving the motor to rotate and generate electricity, and a water-cooled silencer for water-cooling the motor. A first pipe and a second pipe are fixed to the outside of the motor, one end of the first pipe is connected to a water outlet pipe on the water-cooled silencer, and one end of the second pipe is connected to a recovery water pipe on the water-cooled silencer. A water-cooling hood is embedded in the outer shell of the motor. The present invention uses a long worm to quickly cool down the inside of the motor. The rotation water supply mechanism in the long worm can effectively improve the utilization rate of the cold water flow. The cold water flowing in the C-shaped flat tube fully absorbs heat and is then discharged. In addition, if the motor accidentally works and causes excessive local heat generation, which is detected by an external C-shaped temperature measuring stand, it will automatically trigger the corresponding C-shaped flat tube to continue to flow water without waiting for rotation water supply, so that the local heat can be quickly absorbed by the continuously flowing cold water flow.

Description

Technical Field

[0001] The present invention relates to the technical field of generators, in particular to a generator with a built-in water-cooled silencer. Background Art

[0002] A generator refers to a mechanical device that converts mechanical energy into electrical energy. It is driven by a turbine, steam turbine, diesel engine or other power machinery, and converts the energy generated by water flow, air flow, fuel combustion or nuclear fission into mechanical energy and transmits it to the generator, which is then converted into electrical energy by the generator. The generator set in the prior art drives the central shaft of the generator to rotate through the internal combustion engine, and then the generator works to generate electricity. The water-cooled generator will be equipped with an independent water-cooled silencer, which continuously supplies cold water to the generator. The cold water flows on the surface of the generator, absorbs the heat in the generator, and finally becomes a flow of water at room temperature and flows back to the water-cooled silencer for cooling treatment. If the utilization rate of the cold water flow in the whole process can be improved, the energy-saving and emission reduction performance of the entire generator can be improved. For this purpose, the present invention provides a generator with a built-in water-cooled silencer. Summary of the Invention

[0003] The object of the present invention is to provide a generator with a built-in water-cooled silencer to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a generator with a built-in water-cooled silencer, comprising a generator case, a motor provided in the generator case, an internal combustion engine driving the motor to rotate and generate electricity, and a water-cooled silencer for water-cooling the motor; a first tube and a second tube are fixed to the outside of the motor, one end of the first tube is connected to the water outlet pipe on the water-cooled silencer, and one end of the second tube is connected to the recovery water pipe on the water-cooled silencer; a water-cooling cover is embedded in the outer shell of the motor, the water-cooling cover comprises a diffuser long flat tube fixedly connected to the other end of the first tube, a converger long flat tube fixedly connected to the other end of the second tube, a row of C-shaped flat tubes fixedly connected between the diffuser long flat tubes and the converger long flat tubes, a C-shaped temperature measuring stand for sensing the temperature on the C-shaped flat tubes, a double-control valve connected in transmission to one end of the C-shaped temperature measuring stand, and a long worm connected in transmission to the row of double-control valves.

[0005] The double-control valve includes a gate arc plate with one end slidingly inserted into the water inlet port on the C-shaped flat tube, a row of intercepting columns fixed in the C-shaped flat tube, and a double-control tool for controlling the switch of the gate arc plate. The gate arc plate is vertically distributed in the long arc plate cavity opened inside the diffuser long flat tube, and the other end of the gate arc plate slides through the plate hole opened on the diffuser long flat tube. The long worm is connected to the double-control tool in a transmission manner, and the double-control tool is in contact with the end of the gate arc plate outside the diffuser long flat tube for transmission.

[0006] The double-control valve further comprises a return spring piece fixed on the outside of the diffuser long flat tube, and one end of the return spring piece elastically supports a protrusion provided on the gate arc plate.

[0007] The gate arc plate is in the shape of an arc plate, with a vertically penetrating main plate hole in the gate arc plate, and a row of branch plate holes in the gate arc plate on one side of the main plate hole. The intercepting column is slidably inserted into the branch plate hole by setting an arc plate column.

[0008] The C-type temperature measuring frame includes a heat-conducting block evenly arranged in a ring in the outer shell of the motor, a C-type pressure column supported by all the heat-conducting blocks, and a deformation rod in vertical contact with the C-type pressure column. One end of the C-type pressure column is transmission-connected to the double control tool.

[0009] The heat-conducting block is fixed on the C-shaped flat tube, one end of the deformable rod that can expand due to heat is inserted into the cylindrical groove opened on the heat-conducting block, and the other end of the deformable rod contacts the inclined convex plate provided on the C-shaped pressure column. The C-shaped pressure column is arranged on one side of the C-shaped flat tube.

[0010] The dual-control device includes a first plate frame fixed on the diffuser long flat tube, a split shaft supported on the first plate frame, and a main control body vertically fixed at one end of the split shaft. The split shaft is movably sleeved in a circular hole opened on the first plate frame, and the long worm is movably sleeved in an inner hole of a cylinder provided on the first plate frame. The other end of the split shaft is connected by a fixed split gear and a helical tooth meshing transmission on the long worm.

[0011] The dual control device also includes a temperature control body distributed parallel to the main control body, a horizontal axis that establishes transmission with the C-shaped pressure column, and a range extender device that is transmission-connected between the horizontal axis and the temperature control body. The main control body and the temperature control body have the same shape, both including a disk body and a convex plate fixed to the edge of one end of the disk body, and both the main control body convex plate and the temperature control body convex plate drive the door arc plate to move by pushing the interception block provided on the door arc plate. The main control body moves the interception block on the door arc plate once each rotation, and the main control bodies in a row of dual control devices move the contacted door arc plate in turn, and the temperature control body drives the door arc plate by swinging.

[0012] The range extender device includes a limit shaft, a rocker arm and a fixed shaft. One end of the limit shaft is vertically fixed to the middle of the disk of the temperature control body. The other end of the limit shaft is connected to the arc-shaped rack provided at one end of the rocker arm through an amplifying gear. The other end of the rocker arm is fixedly connected to one end of the fixed shaft. The other end of the fixed shaft is connected to the bevel gear fixed to one end of the horizontal shaft through a fixed bevel gear. The other end of the horizontal shaft is connected to a row of arc-shaped tooth grooves on the C-shaped pressure column through an overlap gear.

[0013] The range extender device also includes a second plate frame, one end of which is fixed on the diffuser long flat tube, and the limiting shaft, fixed shaft and transverse shaft are respectively movably sleeved in three through holes opened on the second plate frame.

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

[0015] 1. The present invention uses a long worm to quickly cool the interior of the motor. The rotating water supply mechanism in the long worm can effectively improve the utilization rate of the cold water flow. The cold water flowing in the C-shaped flat tube fully absorbs heat before being discharged. In addition, if the motor accidentally operates and causes excessive local heat generation, it will be detected by the external C-shaped temperature measuring stand, which will automatically trigger the continuous flow of water inside the corresponding C-shaped flat tube, without waiting for the rotating water supply. In this way, the local heat can be quickly absorbed by the continuously flowing cold water.

[0016] 2. Traditional technology uses a method where all cooling branch paths jointly supply water for cooling. If the temperature of a single branch path is high and water supply needs to be accelerated, other paths in the normal temperature area do not need to accelerate water supply and cooling. In this way, all branch paths centrally accelerate water supply, which will cause waste problems. The present invention can avoid the waste problem caused by all paths concentrating on accelerating water supply by automatically selecting the water supply mode.

[0017] 3. The present invention drives the door arc plate by rotating the main control body and swinging the temperature control body, thereby opening the port channel of the C-shaped flat tube. Local overheating eventually causes the temperature control body to swing, thereby pushing the door arc plate to move, and the port channel of the C-shaped flat tube continues to open. At this time, during one rotation of the main control body, the main control body can still move the door arc plate, but the door arc plate will not be completely reset after being moved because the convex plate of the temperature control body intercepts and affects the reset of the door arc plate. In this way, the alternating water supply mechanism and the water supply mechanism caused by high heat do not affect each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention.

[0019] Figure 2 Schematic diagram of the location of the water-cooled muffler.

[0020] Figure 3 Schematic diagram of the water cooling cover structure.

[0021] Figure 4 Schematic diagram of the position of the long flat tube for diffuse flow.

[0022] Figure 5 It is a schematic diagram of the double control valve structure.

[0023] Figure 6 This is a schematic diagram of the C-type temperature measuring rack structure.

[0024] Figure 7 This is a schematic diagram of the position of the C-type flat tube.

[0025] Figure 8 Schematic diagram of the heat conduction block structure.

[0026] Figure 9This is a schematic diagram of the dual control structure.

[0027] Figure 10 Schematic diagram of the door arc plate structure.

[0028] Figure 11 This is a schematic diagram of the range extender structure.

[0029] Figure 12 Schematic diagram of the C-type pressure column structure.

[0030] Figure 13 This is a schematic diagram of the main control unit location.

[0031] In the figure: unit box 1, motor 2, water cooling cover 3, long worm 4, diffuser long flat tube 5, converger long flat tube 6, C-type flat tube 7, C-type temperature measuring frame 8, double control valve 9, first tube 10, second tube 11, water-cooled muffler 12, intercepting column 13, door arc plate 14, double control device 15, return spring 16, heat conducting block 17, deformation rod 18, C-type pressure column 19, range extender 20, temperature control body 21, main control body 22, horizontal axis 23, branch axis 24, first plate frame 25, limit axis 26, second plate frame 27, rocker arm 28, fixed axis 29, main plate hole 141, branch plate hole 142, overlap gear 231, branch gear 241, and amplifying gear 261. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the technical solutions in the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0033] See also Figures 1 to 13 The present invention provides a technical solution: a generator with a built-in water-cooled silencer, comprising a generator case 1, in which a motor 2, an internal combustion engine for driving the motor 2 to rotate and generate electricity, and a water-cooled silencer 12 for water-cooling the motor 2 are arranged. A first pipe 10 and a second pipe 11 are fixed to the outside of the motor 2, one end of the first pipe 10 is connected to the water outlet pipe on the water-cooled silencer 12, and one end of the second pipe 11 is connected to the water recovery pipe on the water-cooled silencer 12, a water-cooling cover 3 is embedded in the outer shell of the motor 2, the water-cooling cover 3 includes a diffuser long flat tube 5 fixedly connected to the other end of the first tube 10, a converger long flat tube 6 fixedly connected to the other end of the second tube 11, a row of C-shaped flat tubes 7 fixedly connected between the diffuser long flat tube 5 and the converger long flat tube 6, a C-shaped temperature measuring stand 8 for sensing the temperature on the C-shaped flat tube 7, a double-control valve 9 driven by one end of the C-shaped temperature measuring stand 8, and a long worm 4 driven by the row of double-control valves 9, with reference to Figure 4One end of the long worm 4 establishes a transmission between the central rotating shaft on the motor 2 through the speed reduction transmission mechanism in the prior art. When the central rotating shaft of the motor 2 rotates, the motor 2 works to generate electricity, and at the same time causes the long worm 4 to rotate slowly, so that the water cooling cover 3 performs distributed cold water cooling.

[0034] refer to Figure 5 It is understood that the double-control valve 9 includes a gate arc plate 14 with one end slidingly inserted into the water inlet port on the C-shaped flat tube 7, a row of shut-off columns 13 fixed in the C-shaped flat tube 7, and a double-control device 15 for controlling the opening and closing of the gate arc plate 14. The gate arc plate 14 is vertically distributed in the long arc plate cavity opened inside the diffuser long flat tube 5, and the other end of the gate arc plate 14 slides through the plate hole opened on the diffuser long flat tube 5. The long worm 4 and the double-control device 15 are transmission-connected, and the double-control device 15 and the end of the gate arc plate 14 outside the diffuser long flat tube 5 are in contact with each other for transmission.

[0035] The dual-control valve 9 further includes a return spring piece 16 fixed to the outside of the diffuser long flat tube 5 , and one end of the return spring piece 16 elastically supports a protrusion provided on the gate arc plate 14 .

[0036] refer to Figure 10 It is understood that the door arc plate 14 is shaped like an arc plate, and a vertically penetrating main plate hole 141 is provided in the door arc plate 14, and a row of branch plate holes 142 are provided in the door arc plate 14 on one side of the main plate hole 141. The intercepting column 13 is slidably inserted into the branch plate hole 142 by setting an arc plate column. The intercepting column 13 is pulled out from the branch plate hole 142, and the cold water flow in the diffuser long flat tube 5 is injected into the main plate hole 141, and then injected into the C-type flat tube 7 through the branch plate hole 142. The C-type flat tube 7 is a sensitive heat-conducting material in the prior art. The heat dissipated in the motor 2 is transferred to the C-type flat tube 7 and then absorbed and offset, so that the heat inside the motor 2 is quickly dissipated and cooled.

[0037] refer to Figure 6 It is understood that the C-type temperature measuring frame 8 includes a heat-conducting block 17 evenly arranged in a ring in the outer shell of the motor 2, a C-type pressure column 19 supported by all the heat-conducting blocks 17, and a deformation rod 18 in vertical contact with the C-type pressure column 19. One end of the C-type pressure column 19 is transmission-connected to the double control device 15.

[0038] The heat-conducting block 17 is fixed on the C-shaped flat tube 7. One end of the deformable rod 18 that can expand due to heat is inserted into the cylindrical groove opened on the heat-conducting block 17. The other end of the deformable rod 18 contacts the inclined convex plate provided on the C-shaped pressure column 19. The C-shaped pressure column 19 is ring-arranged on one side of the C-shaped flat tube 7.

[0039] The dual control device 15 includes a first plate frame 25 fixed to the diffuser long flat tube 5, a split shaft 24 supported on the first plate frame 25, and a main control body 22 with one end of the split shaft 24 vertically fixed. The split shaft 24 is movably sleeved in a circular hole opened in the first plate frame 25, and the long worm 4 is movably sleeved in the inner hole of the cylinder provided in the first plate frame 25. The other end of the split shaft 24 is connected to the helical teeth on the long worm 4 through a fixed split gear 241.

[0040] The dual control device 15 also includes a temperature control body 21 distributed parallel to the main control body 22, a horizontal shaft 23 that establishes a transmission with the C-shaped pressure column 19, and a range extender 20 that is transmission-connected between the horizontal shaft 23 and the temperature control body 21. The main control body 22 and the temperature control body 21 have the same shape and both include a disc and a convex plate fixed at one end edge of the disc. The convex plates of the main control body 22 and the temperature control body 21 drive the door arc plate 14 to move by pushing the interception block provided on the door arc plate 14. The main control body 22 moves the interception block on the door arc plate 14 once every rotation, and the main control bodies 22 in a row of dual control devices 15 move the contacted door arc plate 14 in turn, and the temperature control body 21 drives the door arc plate 14 by swinging. Figure 13 and Figure 9 It is understood that the positions of the convex plates on a row of main control bodies 22 are different. In this way, when all the main control bodies 22 rotate synchronously, the timing of the main control bodies 22 to move the door arc plates 14 is different. A row of door arc plates 14 are moved in turn, and the water inlet ports of a row of C-shaped flat tubes 7 are opened in turn.

[0041] The range extender 20 includes a limit shaft 26, a rocker arm 28 and a fixed shaft 29. One end of the limit shaft 26 is vertically fixed to the middle of the disk of the temperature control body 21, and the other end of the limit shaft 26 is connected to the arc-shaped rack provided at one end of the rocker arm 28 through an amplifying gear 261. The other end of the rocker arm 28 is fixedly connected to one end of the fixed shaft 29. The other end of the fixed shaft 29 is connected to the bevel gear fixed to one end of the horizontal shaft 23 through a fixed bevel gear. The other end of the horizontal shaft 23 is connected to a row of arc-shaped tooth grooves on the C-shaped pressure column 19 through a lap gear 231.

[0042] The range extender 20 further includes a second plate frame 27 , one end of which is fixed to the diffuser long flat tube 5 , and the limiting shaft 26 , the fixed shaft 29 and the transverse shaft 23 are movably sleeved in three through holes opened on the second plate frame 27 .

[0043] The water-cooling cover 3 has two mechanisms for delivering cold water flow. One is that the long worm 4 rotates, and through subsequent transmission, all the main control bodies 22 rotate synchronously. The timing of each main control body 22 toggling the gate arc plate 14 is different, so that a row of gate arc plates 14 move in turn. The gate arc plate 14 is partially withdrawn from the C-shaped flat tube 7, and the intercepting column 13 no longer blocks the gate arc plate 14, and then the cold water flow in the dispersed long flat tube 5 is injected into the C-shaped flat tube 7. The diversion water in a row of C-shaped flat tubes 7 is carried out in turn. When water flows in a single C-shaped flat tube 7, the water flow in other C-shaped flat tubes 7 stops flowing, thus stopping The flowing cold water flow can fully absorb the heat emitted from the motor 2. Compared with the traditional technology, the cold water flow flows continuously on the surface of the motor 2. The present invention uses intermittent flow, which can ensure that the cold water flow fully absorbs the heat. The traditional continuous water circulation method has the problem that the cold water is discharged without being fully heated up, which is wasteful. The cold water flow supply mode of the present invention can improve the energy efficiency of the entire generator set. The transmission process between the long worm 4 and the main control body 22 is: the long worm 4 rotates to drive the sub-gear 241, and then drives the main control body 22 to rotate through the sub-shaft 24.

[0044] The present invention also has an automatic water supply adjustment mechanism. If the temperature at the location of the C-shaped flat tube 7 is too high, there is no need to wait for water to be supplied in turn. The deformable rod 18 is a material that can expand and contract with heat in the prior art. The overheating temperature causes the deformable rod 18 to expand and stretch. The deformable rod 18 supports and pushes the C-shaped pressure column 19, and then the C-shaped pressure column 19 rotates to drive the overlapping gear 231 at one end to rotate, and then the fixed shaft 29 is transmitted through the horizontal shaft 23, and then the rocker arm 28 swings to drive the limit shaft 26 to rotate, and then the temperature control body 21 rotates slightly, and the convex plate on the temperature control body 21 pushes the door arc plate 14. After the door arc plate 14 moves, the water inlet port of the C-shaped flat tube 7 is opened, and then water continues to flow in the C-shaped flat tube 7. The cold water flow quickly absorbs the nearby heat. The automatic water supply mechanism caused by high temperature and the rotating water supply mechanism are not contradictory to each other and can occur at the same time, so that the inside of the motor 2 can be cooled safely and quickly.

[0045] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A generator with a built-in water-cooled silencer, comprising a generator box (1), a motor (2) provided in the generator box (1), an internal combustion engine for driving the motor (2) to rotate and generate electricity, and a water-cooled silencer (12) for water-cooling the motor (2), characterized in that: The motor (2) is externally fixed with a first tube (10) and a second tube (11), one end of the first tube (10) is connected to a water outlet pipe on a water-cooled muffler (12), and one end of the second tube (11) is connected to a water recovery pipe on the water-cooled muffler (12), and a water-cooling cover (3) is embedded in the outer shell of the motor (2), and the water-cooling cover (3) includes a diffuser long flat tube (5) fixedly connected to the other end of the first tube (10), a converger long flat tube (6) fixedly connected to the other end of the second tube (11), a row of C-shaped flat tubes (7) fixedly connected between the diffuser long flat tube (5) and the converger long flat tube (6), a C-shaped temperature measuring frame (8) for sensing the temperature on the C-shaped flat tube (7), a double-control valve (9) driven by one end of the C-shaped temperature measuring frame (8), and a long worm (4) driven by the row of double-control valves (9); The double control valve (9) comprises a gate arc plate (14) with one end slidingly inserted into the water inlet port on the C-shaped flat tube (7), a row of intercepting columns (13) fixed in the C-shaped flat tube (7), and a double control device (15) for controlling the opening and closing of the gate arc plate (14), wherein the gate arc plate (14) is vertically distributed in a long arc plate cavity opened inside the diffuser long flat tube (5), and the other end of the gate arc plate (14) slides through a plate hole opened on the diffuser long flat tube (5), the long worm (4) and the double control device (15) are connected in transmission, and the double control device (15) and the end of the gate arc plate (14) outside the diffuser long flat tube (5) are in contact transmission; The dual-control valve (9) further comprises a return spring (16) fixed to the outside of the diffuser long flat tube (5), one end of the return spring (16) elastically supporting a protrusion provided on the door arc plate (14); The door arc plate (14) is in the shape of an arc plate, and a vertically penetrating main plate hole (141) is provided in the door arc plate (14), and a row of branch plate holes (142) are provided in the door arc plate (14) on one side of the main plate hole (141). The intercepting column (13) is slidably inserted into the branch plate hole (142) by providing an arc plate column on the intercepting column (13).

2. The generator with a built-in water-cooled silencer according to claim 1, characterized in that: The C-type temperature measuring frame (8) comprises a heat conducting block (17) uniformly arranged in a ring in the outer shell of the motor (2), a C-type pressure column (19) supported by all the heat conducting blocks (17), and a deformation rod (18) vertically contacting the C-type pressure column (19), and one end of the C-type pressure column (19) is connected to the double control device (15) in a transmission manner.

3. The generator with a built-in water-cooled silencer according to claim 2, characterized in that: The heat conducting block (17) is fixed on the C-shaped flat tube (7), one end of a deformation rod (18) that can expand due to heat is inserted into a cylindrical groove provided on the heat conducting block (17), and the other end of the deformation rod (18) contacts a convex plate with an inclined surface provided on a C-shaped pressure column (19), and the C-shaped pressure column (19) is arranged on one side of the C-shaped flat tube (7).

4. The generator with a built-in water-cooled silencer according to claim 2, characterized in that: The dual control device (15) includes a first plate frame (25) fixed on the diffuser long flat tube (5), a split shaft (24) supported on the first plate frame (25), and a main control body (22) vertically fixed at one end of the split shaft (24); the split shaft (24) is movably sleeved in a circular hole opened on the first plate frame (25); the long worm (4) is movably sleeved in a cylindrical inner hole provided on the first plate frame (25); and the other end of the split shaft (24) is connected to the helical teeth on the fixed split gear (241) through meshing transmission.

5. The generator with a built-in water-cooled silencer according to claim 4, characterized in that: The dual control device (15) further includes a temperature control body (21) distributed in parallel with the main control body (22), a transverse shaft (23) for establishing transmission with the C-shaped pressure column (19), and a range extender (20) for transmission connection between the transverse shaft (23) and the temperature control body (21). The main control body (22) and the temperature control body (21) have the same shape and both include a disc body and a convex plate fixed at one end edge of the disc body. The convex plate of the main control body (22) and the convex plate of the temperature control body (21) both drive the door arc plate (14) to move by pushing the interception block provided on the door arc plate (14). The main control body (22) moves the interception block on the door arc plate (14) once every rotation. The main control bodies (22) in a row of dual control devices (15) move the contacted door arc plate (14) in turn, and the temperature control body (21) drives the door arc plate (14) by swinging.

6. The generator with a built-in water-cooled silencer according to claim 5, characterized in that: The range extending device (20) comprises a limit shaft (26), a rocker (28) and a fixed shaft (29), one end of the limit shaft (26) is vertically fixed to the middle of the disk of the temperature control body (21), the other end of the limit shaft (26) is connected to the arc-shaped rack provided at one end of the rocker (28) by means of an amplifying gear (261), the other end of the rocker (28) is fixedly connected to one end of the fixed shaft (29), the other end of the fixed shaft (29) is connected to the bevel gear fixed at one end of the transverse shaft (23) by means of a fixed bevel gear, and the other end of the transverse shaft (23) is connected to the row of tooth grooves arranged in an arc shape on the C-shaped pressure column (19) by means of a lap gear (231).

7. The generator with a built-in water-cooled silencer according to claim 6, characterized in that: The range extender (20) further comprises a second plate frame (27), one end of which is fixed on the diffuser long flat tube (5), and the limiting shaft (26), the fixed shaft (29) and the transverse shaft (23) are respectively movably sleeved in three through holes opened on the second plate frame (27).

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