A hammer positioning frame based on high strain method detection

Abstract

This invention relates to hammer-positioning frame technology to address the problem of low accuracy in high-strain dynamics (HSD) detection data due to the influence of impact hammer center-of-gravity offset and sensor installation position offset. Specifically, it provides a hammer-positioning frame based on HSD detection, comprising a base frame with an upper frame mounted on its upper end, and an impact pile positioned at the middle of the inner side of the base frame. The invention utilizes telescopic components on the horizontal and vertical frames to adjust the horizontal and vertical distances, aligning the center of the base frame with the center of the impact pile. This prevents positional offset when the impact hammer strikes the pile, improving the accuracy of the detected data. Furthermore, by allowing two auger drill bits to drill holes on the surface of the impact pile without offset, the sensor's force direction remains parallel to the axis of the impact pile, further enhancing the accuracy of the sensor's detection data.

Description

Technical Field

[0001] This invention relates to hammer-impact positioning frame technology, specifically a hammer-impact positioning frame based on high strain method detection. Background Technology

[0002] High strain testing is a testing method for determining the vertical compressive bearing capacity and integrity of a single pile. During the experiment, a heavy hammer is used to impact the top of the pile, and the velocity and force time history curves at the top of the pile are measured and analyzed using wave theory.

[0003] In existing technologies, the hammer positioning frame, consisting of a bottom frame and an upper frame, is usually moved by hoisting equipment. The upper frame is installed on the bottom frame. The bottom frame is heavy and difficult to adjust precisely after being hoisted to the designated position. Misalignment of the bottom frame can cause the center position of the impact hammer on the impact pile to shift, which can lead to lower accuracy of the data detected by the high-strain method. When installing the sensor for high-strain method detection on the impact pile, the force direction of the sensor must be parallel to the axis of the impact pile to ensure accurate detection of the force on the impact pile. The surface of the impact pile is curved. When workers drill holes for the sensor installation using drilling equipment, the drilling position can easily shift, causing the installed sensor to not be vertical and adversely affecting the accuracy of the detected data.

[0004] To address the aforementioned technical problems, this application proposes a solution. Summary of the Invention

[0005] The purpose of this invention is to adjust the lateral and vertical distances by using telescopic components on the lateral and vertical frames, so that the center of the bottom frame coincides with the center of the impact pile. This prevents the impact hammer from shifting its position when striking the impact pile, thus improving the accuracy of the detected data. By allowing two auger drill bits to drill holes on the surface of the impact pile without shifting the drilled holes, the force direction of the sensor can be kept parallel to the axis of the impact pile, further improving the accuracy of the sensor's detection data. This invention addresses the problem of low accuracy in high-strain method detection data due to the influence of impact hammer center of gravity shift and sensor installation position shift. Therefore, it proposes a hammer positioning frame based on high-strain method detection.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A hammer positioning frame based on high strain gauge detection includes a base frame, an upper frame mounted on the upper end of the base frame, an impact pile located at the middle of the inner side of the base frame, limit plates integrally formed on both sides of the inner sidewall of the upper frame, an impact hammer slidably connected to the inner sidewall of the upper frame, a limit frame integrally formed on the outer side of the impact hammer corresponding to the position of the limit plate, a traction steel wire rope pulled at the upper end of the impact hammer, connecting blocks installed at the four corner positions of the inner side of the base frame, electric push rods installed on the inner sidewalls of the connecting blocks, a rolling wheel installed at the end of the electric push rod away from the connecting block, a sliding groove formed on the lower surface of the base frame, a transverse frame installed on the lower surface of the base frame corresponding to the sliding groove, a vertical frame installed on the lower surface of the base frame above the transverse frame, pads integrally formed at the four corner positions of the lower surface of the vertical frame, and telescopic components provided on both sides of the upper surface of the transverse frame and both sides of the outer sidewall of the vertical frame.

[0008] In a preferred embodiment of the present invention, the telescopic assembly includes a mounting base, which is respectively installed on both sides of the upper surface of the transverse frame and both sides of the outer wall of the vertical frame. A hydraulic push rod is installed on the side of the outer wall of the mounting base near the bottom frame, and an electromagnet connecting plate is connected to the end of the hydraulic push rod away from the mounting base.

[0009] In a preferred embodiment of the present invention, a connecting ring is installed on the outer wall of the impact pile, and an installation block is integrally formed at the middle position of the outer wall of the connecting ring. A limiting rod is connected to each of the four corner positions of the outer wall of the installation block, and two through holes are opened at the middle position of the outer wall of the installation block. A sliding plate is slidably connected to the outer wall of the limiting rod, and a spiral drill bit is rotatably connected to the outer wall of the sliding plate at the position corresponding to the through hole.

[0010] In a preferred embodiment of the present invention, a limiting insertion hole is provided at each of the four corner positions of the outer side wall of the sliding plate, a transmission gear is rotatably connected to the outer side wall of the sliding plate corresponding to the position of the auger drill bit, a drive gear is rotatably connected to the middle position of the outer side wall of the sliding plate, and a connecting seat is installed at the middle position of the outer side wall of the drive gear.

[0011] In a preferred embodiment of the present invention, a telescopic cavity is provided at the middle position of the inner sidewall of the connecting ring, and a frame is slidably connected inside the telescopic cavity by a telescopic spring. An insertion hole is provided on the outer sidewall of the connecting ring corresponding to the position of the auger drill bit, and a feeding groove is installed at the middle position of the lower surface of the frame.

[0012] In a preferred embodiment of the present invention, a blower fan is connected to the outer wall of the feeding trough, a connecting shaft is rotatably connected to the lower surface of the connecting ring at the position corresponding to the blower fan, a transmission wheel is connected to the outer wall of the connecting shaft, and a rotating gear is rotatably connected to the outer wall of the connecting ring at the position corresponding to the transmission gear. The transmission wheel is connected to the transmission gear via a transmission belt.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. By ensuring close contact between the four electric push rods on the four directions inside the bottom frame and the impact pile, and by detecting the length of the electric push rod through the infrared distance sensor on the electric push rod, the control equipment processes and compares the detected length data to determine the offset position of the bottom frame. Then, based on the processed offset data, the horizontal and vertical distances are adjusted sequentially through the telescopic components on the horizontal and vertical frames to make the center of the bottom frame coincide with the center of the impact pile. This prevents the impact hammer from shifting its position when striking the impact pile, thus improving the accuracy of the detected data.

[0015] 2. By connecting the drill bit of the drilling equipment to the connecting seat on the drive gear, the rotation of the drill bit drives the drive gear to rotate, which in turn drives the auger drill bit connected to the transmission gear to rotate. Under the constraint of the connecting ring, the two auger drill bits can perform drilling operations on the surface of the impact pile. The drilled hole will not deviate, and the force direction of the sensor can be kept parallel to the axis of the impact pile, which helps to improve the accuracy of the sensor detection data. Attached Figure Description

[0016] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0017] Figure 1 This is a structural diagram of the main body of the present invention;

[0018] Figure 2 This is a structural diagram of the hammer positioning frame of the present invention;

[0019] Figure 3 This is a diagram of the internal structure of the bottom frame of the present invention;

[0020] Figure 4 This is a diagram of the horizontal frame structure of the present invention;

[0021] Figure 5 This is a structural diagram of the connecting ring of the present invention;

[0022] Figure 6 For the present invention Figure 5 Enlarged structural diagram of part A;

[0023] Figure 7 This is a structural diagram of the inner side of the connecting ring of the present invention;

[0024] Figure 8 This is a structural diagram of the sliding plate of the present invention;

[0025] In the diagram: 1. Base frame; 21. Telescopic assembly; 22. Horizontal frame; 23. Vertical frame; 24. Connecting block; 25. Pad block; 26. Rolling wheel; 27. Electric push rod; 31. Connecting ring; 32. Mounting block; 33. Limiting rod; 34. Sliding plate; 35. Rotating gear; 36. Transmission belt; 37. Transmission wheel; 38. Connecting shaft; 39. Blower fan; 310. Discharge chute; 311. Enclosure frame; 312. Spiral drill bit; 313. Limiting insertion hole; 314. Connecting seat; 315. Transmission gear; 316. Drive gear; 4. Impact pile; 5. Upper frame; 6. Impact hammer; 7. Limiting frame; 8. Limiting plate; 9. Traction wire rope. Detailed Implementation

[0026] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Example 1:

[0028] Please see Figure 1-4 As shown, a hammer positioning frame based on high strain method detection includes a bottom frame 1, an upper frame 5 installed on the upper end of the bottom frame 1, an impact pile 4 provided at the middle position of the inner side of the bottom frame 1, limit plates 8 integrally formed on both sides of the inner side wall of the upper frame 5, an impact hammer 6 slidably connected to the inner side wall of the upper frame 5, a limit frame 7 integrally formed on the outer side of the impact hammer 6 corresponding to the position of the limit plate 8, and a traction steel wire rope 9 pulled at the upper end of the impact hammer 6.

[0029] Connecting blocks 24 are installed at the four corners inside the bottom frame 1. Electric push rods 27 are installed on the inner wall of the connecting blocks 24. The four electric push rods 27 are arranged around the central axis of the impact pile 4. An infrared distance sensor is connected to the outer wall of each electric push rod 27 to detect its extension length. A rolling wheel 26 is installed at the end of each electric push rod 27 away from the connecting blocks 24. A pressure sensor is also installed at the connection point between the electric push rod 27 and the rolling wheel 26. The outer frame of the rolling wheel 26 is slidably connected to the connecting plate at one end of the electric push rod 27 via a sliding rod. A compression spring is sleeved on the outer side of the sliding rod. The pressure sensor is connected at the middle position of the outer frame of the rolling wheel 26. A groove is formed on the lower surface of the bottom frame 1. The groove is divided into a horizontal groove and a vertical groove. The depth of the vertical groove is twice the depth of the horizontal groove. A transverse frame 22 is installed at the location of the chute. A vertical frame 23 is installed on the lower surface of the bottom frame 1 above the transverse frame 22. A pad 25 is integrally formed at the four corners of the lower surface of the vertical frame 23. Telescopic components 21 are provided on both sides of the upper surface of the transverse frame 22 and on both sides of the outer wall of the vertical frame 23. The telescopic components 21 do not contact the ground and will not rub against the ground during the extension and retraction process, thus preventing damage to the equipment. The telescopic components 21 include mounting seats, which are respectively installed on both sides of the upper surface of the transverse frame 22 and on both sides of the outer wall of the vertical frame 23. A hydraulic push rod is installed on the side of the outer wall of the mounting seat near the bottom frame 1. An infrared distance sensor is connected to the outer wall of the hydraulic push rod. The extension and retraction of the hydraulic push rod can be adjusted by the control of the hydraulic system through the detection system. An electromagnet connecting plate is connected to the end of the hydraulic push rod away from the mounting seat.

[0030] In the prior art, the hammer positioning frame composed of the bottom frame 1 and the upper frame 5 is moved by lifting equipment. The upper frame 5 is installed on the bottom frame 1. The weight of the bottom frame 1 is large, and it is not convenient to make fine position adjustments after it is lifted to the designated position. The positional deviation of the bottom frame 1 can easily cause the center position of the impact hammer 6 on the upper frame 5 to strike the impact pile 4 to shift. The shift can easily lead to low accuracy of the data detected by the high strain method.

[0031] After the base frame 1 is placed at the position of the impact pile 4 by the hoisting equipment, the electric push rods 27 are installed at the four corner positions inside the base frame 1 through the connecting block 24. Then, the electric push rods 27 are connected to the control equipment of the detection system. After connection, the control equipment controls the four electric push rods 27 to extend simultaneously. When the pressure data transmitted to the control equipment by the pressure sensors on the four electric push rods 27 are the same, the signal is transmitted to the infrared distance sensor to detect the extension length of the four electric push rods 27 respectively, and the data is transmitted to the control equipment for data comparison. If the deviation between the four extension data is within the set data deviation range, no position adjustment of the base frame 1 is required. If the deviation between the four extension data is not within the set data deviation range, the electric push rods 27 and the base frame 1 form a right-angled triangle structure. The tilt angle of 27 is fixed, allowing the control device to calculate the lateral and vertical extension distances of the electric push rod 27 using the Pythagorean theorem. The calculated lateral and vertical extension distances of the electric push rod 27 on the same side are compared to obtain the lateral and vertical extension distances required for the center of the bottom frame 1 to coincide with the center of the impact pile 4. The required lateral and vertical extension distances are then transmitted to the telescopic components 21 on the lateral frame 22 and vertical frame 23 for adjustment. The electromagnet connecting plate at one end of the telescopic component 21 is attached to the bottom frame 1. The telescopic components 21 on the lateral frame 22 and vertical frame 23 sequentially drag the bottom frame 1 to slide and adjust its position on the lateral frame 22 and vertical frame 23, so that the center of the bottom frame 1 coincides with the center of the impact pile 4.

[0032] Example 2:

[0033] Please see Figure 5-8As shown, a connecting ring 31 is installed on the outer wall of the impact pile 4. The connecting ring 31 is semi-circular and can be fitted onto the outside of the impact pile 4 by the mutual mating of two connecting rings 31. An installation block 32 is integrally formed at the middle position of the outer wall of the connecting ring 31. A limiting rod 33 is connected to each of the four corners of the outer wall of the installation block 32. Two through holes are opened at the middle position of the outer wall of the installation block 32. A sliding plate 34 is slidably connected to the outer wall of the limiting rod 33. A spiral drill bit 312 is rotatably connected to the outer wall of the sliding plate 34 corresponding to the through hole position. A limiting hole 313 is provided at each of the four corners of the outer wall of the sliding plate 34. The sliding plate 34 is sleeved on the outside of the limiting rod 33 through the limiting hole 313. A transmission gear 315 is rotatably connected to the outer wall of the sliding plate 34 at the position corresponding to the auger drill bit 312. A drive gear 316 is rotatably connected to the middle position of the outer wall of the sliding plate 34. The two transmission gears 315 and the drive gear 316 are on the same plane, and the two transmission gears 315 and the drive gear 316 are interlocked and driven to rotate. The outer wall of the drive gear 316 A connecting seat 314 is installed at the middle position. A connecting port is opened at the middle position of the outer wall of the connecting seat 314, allowing the drill bit of the drilling equipment to be inserted into the connecting port to drive the drive gear 316 to rotate. A telescopic cavity is opened at the middle position of the inner wall of the connecting ring 31. A retaining frame 311 is slidably connected inside the telescopic cavity via a telescopic spring. An insertion hole is opened on the outer wall of the connecting ring 31 corresponding to the position of the spiral drill bit 312. A feeding groove 310 is installed at the middle position of the lower surface of the retaining frame 311. A feeding groove 310 is installed at the position of the lower surface of the retaining frame 311 corresponding to the position of the feeding groove 310. The feed trough 310 has openings, and a blower fan 39 is connected to the outer wall of the feed trough 310. A filter screen is installed on the inner side of the feed trough 310 at the position corresponding to the blower fan 39. A connecting shaft 38 is rotatably connected to the lower surface of the connecting ring 31 at the position corresponding to the blower fan 39. A transmission wheel 37 is connected to the outer wall of the connecting shaft 38. A rotating gear 35 is rotatably connected to the outer wall of the connecting ring 31 at the position corresponding to the transmission gear 315. The rotating gear 35 and the transmission gear 315 are interlocked and driven to rotate. The transmission wheel 37 is connected to the transmission gear 315 through a transmission belt 36.

[0034] In the prior art, when installing the sensor for high strain method detection on the impact pile 4, the direction of force on the sensor needs to be parallel to the axis of the impact pile 4 to facilitate accurate detection of the force on the impact pile 4. The surface of the impact pile 4 is curved. When the workers drill the sensor installation hole with drilling equipment, the vertical drilling position is prone to offset, which makes the installed sensor not keep a vertical state and adversely affects the accuracy of the detected data.

[0035] Workers can fit two semi-circular connecting rings 31 onto the outside of the impact pile 4 and fasten the connecting rings 31 onto the outside of the impact pile 4 with bolts. When the worker performs drilling operations, the drill bit can be inserted into the connection port on the connecting seat 314, so that the drill bit drives the drive gear 316 to rotate, and drives the transmission gear 315 that is engaged with the drive gear 316 to rotate. The transmission gear 315 is connected to the spiral drill bit 312 on the sliding plate 34, so that the rotation of the transmission gear 315 can drive the spiral drill bit 312 to rotate. When the drilling equipment presses the sliding plate 34, the sliding plate 34 moves along the trajectory of the limit rods 33 under the restriction of the four limit rods 33, so that the sliding plate 34 will not deviate when it moves. The two spiral drill bits 312 drill holes on the surface of the impact pile 4 under the pressure. The drilled holes will not deviate vertically, so that the force direction of the sensor can be kept parallel to the axis of the impact pile 4, which can improve the accuracy of the sensor detection data.

[0036] During rotation, the transmission gear 315 drives the rotating gear 35 connected below the connecting ring 31 to rotate. The transmission wheel 37 on the connecting shaft of the rotating gear 35 is connected to the transmission wheel 37 on the connecting shaft 38 of the connecting fan 39 via the transmission belt 36. This allows the transmission gear 315 to drive the fan 39 to rotate and draw air out of the material chute 310. The telescopic cavity opened on the inner side of the connecting ring 31 at the position of the auger drill bit 312 is connected to the frame 311 by a telescopic spring. During the process of connecting the connecting ring 31 to the outside of the impact pile 4, the frame 311 is compressed and retracted into the telescopic cavity under the action of the telescopic spring. Inside, one end of the enclosure frame 311 is always in close contact with the surface of the impact pile 4 under the action of the telescopic spring, so that the dust generated during the drilling process will not spread to the external environment under the restriction of the enclosure frame 311. Under the action of the blower fan 39, the dust is discharged downward with the airflow and discharged into the collection box connected to the lower end of the discharge trough 310. The collection box is detachably connected to the lower end of the discharge trough 310 for easy removal and dumping of collected dust. The filter screen connected to the discharge trough 310 at the position corresponding to the blower fan 39 can filter the dust that comes with the airflow, preventing the dust from spreading outward while the airflow flows outward, and preventing dust and flying debris from damaging the eyes of the workers.

[0037] In use, the operator can place two semi-circular connecting rings 31 on the outside of the impact pile 4 and secure them with bolts. When drilling, the operator can insert the drill bit into the connection port on the connecting seat 314, causing the drill bit to drive the drive gear 316 to rotate and drive the transmission gear 315, which is engaged with the drive gear 316, to rotate. The transmission gear 315 is connected to the spiral drill bit 312 on the sliding plate 34, so that the rotation of the transmission gear 315 can drive the spiral drill bit 312 to rotate. When the drilling equipment presses the sliding plate 34, the sliding plate 34 moves along the trajectory of the limit rods 33 under the restriction of the four limit rods 33, so that the sliding plate 34 will not deviate when it moves. The two spiral drill bits 312 drill holes in the surface of the impact pile 4 under the pressure, and the drilled holes will not deviate vertically, so that the force direction of the sensor can be kept parallel to the axis of the impact pile 4, which can improve the accuracy of the sensor detection data.

[0038] After the base frame 1 is placed at the position of the impact pile 4 by the hoisting equipment, the electric push rods 27 are installed at the four corner positions inside the base frame 1 through the connecting block 24. Then, the electric push rods 27 are connected to the control equipment of the detection system. After connection, the control equipment controls the four electric push rods 27 to extend simultaneously. When the pressure data transmitted to the control equipment by the pressure sensors on the four electric push rods 27 are the same, the signal is transmitted to the infrared distance sensor to detect the extension length of the four electric push rods 27 respectively, and the data is transmitted to the control equipment for data comparison. If the deviation between the four extension data is within the set data deviation range, no position adjustment of the base frame 1 is required. If the deviation between the four extension data is not within the set data deviation range, the electric push rods 27 and the base frame 1 form a right-angled triangle structure. The tilt angle of 27 is fixed, allowing the control device to calculate the lateral and vertical extension distances of the electric push rod 27 using the Pythagorean theorem. The calculated lateral and vertical extension distances of the electric push rod 27 on the same side are compared to obtain the lateral and vertical extension distances required for the center of the bottom frame 1 to coincide with the center of the impact pile 4. The required lateral and vertical extension distances are then transmitted to the telescopic components 21 on the lateral frame 22 and vertical frame 23 for adjustment. The electromagnet connecting plate at one end of the telescopic component 21 is attached to the bottom frame 1. The telescopic components 21 on the lateral frame 22 and vertical frame 23 sequentially drag the bottom frame 1 to slide and adjust its position on the lateral frame 22 and vertical frame 23, so that the center of the bottom frame 1 coincides with the center of the impact pile 4.

[0039] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A hammer positioning frame based on high strain method detection, comprising a base frame (1), an upper frame (5) mounted on the upper end of the base frame (1), an impact pile (4) provided at the middle position of the inner side of the base frame (1), limit plates (8) integrally formed on both sides of the inner sidewall of the upper frame (5), an impact hammer (6) slidably connected to the inner sidewall of the upper frame (5), a limit frame (7) integrally formed on the outer side of the impact hammer (6) corresponding to the position of the limit plate (8), and a traction steel wire rope (9) pulled at the upper end of the impact hammer (6), characterized in that, Connecting blocks (24) are installed at the four corners of the inner side of the bottom frame (1). An electric push rod (27) is installed on the inner wall of the connecting block (24). A rolling wheel (26) is installed at the end of the electric push rod (27) away from the connecting block (24). A sliding groove is opened on the lower surface of the bottom frame (1). A horizontal frame (22) is installed on the lower surface of the bottom frame (1) corresponding to the sliding groove. A vertical frame (23) is installed on the lower surface of the bottom frame (1) above the horizontal frame (22). A pad (25) is integrally formed at the four corners of the lower surface of the vertical frame (23). Telescopic components (21) are provided on both sides of the upper surface of the horizontal frame (22) and on both sides of the outer wall of the vertical frame (23).

2. The hammer positioning frame based on high strain method detection according to claim 1, characterized in that, The telescopic assembly (21) includes a mounting base, which is installed on both sides of the upper surface of the transverse frame (22) and both sides of the outer wall of the vertical frame (23). A hydraulic push rod is installed on the side of the outer wall of the mounting base near the bottom frame (1), and an electromagnet connecting plate is connected to the end of the hydraulic push rod away from the mounting base.

3. The hammer positioning frame based on high strain method detection according to claim 1, characterized in that, A connecting ring (31) is installed on the outer wall of the impact pile (4). An installation block (32) is integrally formed at the middle position of the outer wall of the connecting ring (31). A limiting rod (33) is connected to each of the four corner positions of the outer wall of the installation block (32). Two through holes are opened at the middle position of the outer wall of the installation block (32). A sliding plate (34) is slidably connected to the outer wall of the limiting rod (33). A spiral drill bit (312) is rotatably connected to the outer wall of the sliding plate (34) at the position corresponding to the through hole.

4. A hammer positioning frame based on high strain method detection according to claim 3, characterized in that, A limiting insertion hole (313) is provided at each of the four corners of the outer wall of the sliding plate (34). A transmission gear (315) is rotatably connected to the outer wall of the sliding plate (34) corresponding to the position of the spiral drill bit (312). A drive gear (316) is rotatably connected to the middle position of the outer wall of the sliding plate (34). A connecting seat (314) is installed at the middle position of the outer wall of the drive gear (316).

5. A hammer positioning frame based on high strain method detection according to claim 4, characterized in that, A telescopic cavity is provided at the middle position of the inner side wall of the connecting ring (31). A frame (311) is slidably connected inside the telescopic cavity by a telescopic spring. An insertion hole is provided on the outer side wall of the connecting ring (31) at the position corresponding to the spiral drill bit (312). A feeding groove (310) is installed at the middle position of the lower surface of the frame (311).

6. A hammer positioning frame based on high strain method detection according to claim 5, characterized in that, A blower fan (39) is connected to the outer wall of the feeding trough (310). A connecting shaft (38) is rotatably connected to the lower surface of the connecting ring (31) at the position corresponding to the blower fan (39). A transmission wheel (37) is connected to the outer wall of the connecting shaft (38). A rotating gear column (35) is rotatably connected to the outer wall of the connecting ring (31) at the position corresponding to the transmission gear (315). The transmission wheel (37) is connected to the transmission gear (315) via a transmission belt (36).

Images