Bulk rice grain grinding device based on dynamic pressure adjustment

Abstract

The invention discloses the technical field of rice grain grinding production, and discloses a rice huller, main body equipment used for rice hulling and a low-speed roller in the rice huller. The low-speed roller is composed of a plurality of sleeves. The inner walls of the sleeves are fixedly connected with inner gear rings, the sleeves are internally provided with first gears, the first gears are externally connected with sensors, and the sensors are used for detecting the torque of the first gears to the first shafts. An adjusting mechanism, a pressure mechanism and a control mechanism are arranged at each gear; the low-speed roller is composed of the multiple sleeves, the distance between each sleeve and the high-speed roller can be automatically adjusted according to self pressure, then dynamic pressure adjustment is completed, meanwhile, due to the fact that the adjusting processes of the sleeves are mutually independent, the defect that in a traditional scheme, an integrated low-speed roller can only conduct overall pressure adjustment can be effectively overcome, and the overall pressure adjustment efficiency is improved. The pressure adjustment of the low-speed roller on the rice is more refined, so that the hulling rate of the rice is effectively improved, and the broken rice rate of the rice is reduced.

Description

Technical Field

[0001] This invention relates to the field of rice grain milling technology, specifically to a bulk rice grain milling device based on dynamic pressure adjustment. Background Technology

[0002] Commonly used equipment for rice milling includes rice hullers. These machines use two pairs of rubber rollers that rotate in opposite directions with a speed difference to break the husks through squeezing and friction, thus producing brown rice. The high-speed roller is usually a fixed roller, while the low-speed roller is a movable roller. The pressure on the rice during the hulling process is controlled by adjusting the position and pressure of the low-speed roller.

[0003] During the use of a rice huller, it is generally necessary to adjust the pressure of the low-speed roller and the distance between the low-speed and high-speed rollers according to the condition of the rice. This ensures that the rice is subjected to appropriate pressure during the hulling process, thereby guaranteeing the rice dehulling rate and reducing the rice breakage rate. However, since the adjustment process can only be performed on the low-speed roller as a whole, when the low-speed or high-speed rollers are worn, resulting in uneven surfaces, or when the amount of rice fed into the gap between the low-speed and high-speed rollers is uneven, the rice undergoing hulling will be subjected to uneven force, leading to a decrease in the dehulling rate and an increase in the rice breakage rate. Summary of the Invention

[0004] The purpose of this invention is to provide a bulk rice grain milling device based on dynamic pressure adjustment to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a bulk rice grain milling device based on dynamic pressure adjustment, comprising a rice huller, a main body for rice hulling, and a low-speed roller in the rice huller, wherein the low-speed roller is composed of multiple sleeves; The inner wall of each sleeve is fixedly connected with an internal gear ring, and each sleeve is provided with a gear 1. The rice huller is driven by a shaft 1. The rice huller can drive a low-speed roller to rotate through the shaft 1 and apply pressure to the rice. All gear 1 are coaxially fixedly connected to the shaft 1. Gear 1 meshes with gear 2, and gear 2 meshes with a corresponding internal gear ring. The gear two is rotatably connected to a connecting rod one, and the other end of the connecting rod one is rotatably connected to a shaft one. The gear one is externally connected to a sensor, which is used to detect the torque of the gear pair on the shaft one. Each gear is equipped with an adjustment mechanism, a pressure mechanism, and a control mechanism; the control mechanism is mounted on the shaft and is connected to the sleeve drive. The pressure mechanism is used to apply pressure to the sleeve; the control mechanism can change the distance between the corresponding sleeve and the high-speed roller in the rice huller according to the torque detected by the sensor; the adjustment mechanism can control the movement of gear two when the control mechanism controls the movement of the sleeve, so that gear one, gear two and the internal gear ring remain meshed.

[0006] Furthermore, the control mechanism includes a mounting plate, and the rice huller is provided with a fixing mechanism for fixing the position of the mounting plate. Shaft one passes through the mounting plate and is rotatably connected to the mounting plate. The mounting plate has a through groove, and a slider is slidably connected in the through groove. The slider is rotatably connected to shaft two, which is parallel to shaft one. Shaft two is rotatably connected to a bracket. The side wall of the internal gear ring has an annular connecting groove, and the bracket is slidably connected to the connecting groove. The mounting plate is provided with a driving mechanism for controlling the slider to slide along the through groove according to the torque detected by the sensor.

[0007] Furthermore, the pressure mechanism includes a second connecting rod, which is fixedly connected to and parallel to the first connecting rod. A third connecting rod is rotatably mounted on the first shaft. Pressure rollers are rotatably connected to the ends of both the second and third connecting rods. The positions of the second and third connecting rods are symmetrical about the extension line of the through groove trajectory. The third connecting rod is driven by a first transmission mechanism, which drives the third connecting rod to always maintain symmetry with the second connecting rod.

[0008] Furthermore, the inner wall of the sleeve is provided with annular mounting grooves on both sides of the inner toothed ring, and the pressure rollers are respectively rolled in the mounting grooves.

[0009] Furthermore, the driving mechanism includes a motor, the output shaft of which is fixedly connected to a screw, the screw passing through the slider and being threadedly connected to the slider, and the end of the screw being driven by a second transmission mechanism, the second transmission mechanism being driven by the connecting rod and the first transmission mechanism, the second transmission mechanism being able to drive the connecting rod to rotate around the shaft.

[0010] Furthermore, the adjusting mechanism includes a first half gear, which is rotatably connected to a first shaft, a first connecting rod is fixedly connected to a side wall of the half gear, and the second transmission mechanism is drively connected to the first half gear.

[0011] Furthermore, the second transmission mechanism includes a first bevel gear, which is coaxially and fixedly connected to the end of the screw. A second bevel gear is rotatably connected to the mounting plate, and the first bevel gear meshes with the second bevel gear. A third gear is rotatably disposed on the other end of the mounting plate at the second bevel gear, and the third gear is coaxially and fixedly connected to the second bevel gear. The third gear meshes with a first half gear.

[0012] Furthermore, the first transmission mechanism includes a second half gear, which is rotatably connected to a shaft, a third connecting rod is fixedly connected to the side wall of the second half gear, a fourth gear that meshes with the third gear is rotatably connected to the side wall of the mounting plate, and a fifth gear is coaxially fixedly connected to the fourth gear, which meshes with the second half gear.

[0013] Furthermore, the fixing mechanism includes multiple fixing rods 1 and 2 that penetrate all mounting plates, and the fixing rods 1 and 2 are fixedly connected to the rice huller.

[0014] Furthermore, fixing blocks are fixedly connected to both side walls of the fixing rod at the bracket, and the fixing blocks are used to cooperate with each other to clamp the side walls of the bracket.

[0015] Compared with the prior art, the beneficial effects of the present invention are: This invention uses multiple sleeves to form a low-speed roller, and each sleeve can adjust its distance from the high-speed roller according to its own pressure, thereby achieving dynamic pressure adjustment. At the same time, since the adjustment process of each sleeve is independent, it can effectively avoid the shortcomings of the integrated low-speed roller in the traditional solution, which can only perform overall pressure adjustment. This makes the pressure adjustment of rice by the low-speed roller more precise, thereby effectively improving the rice hulling rate and reducing the rice breakage rate.

[0016] The axes of the sleeve and the high-speed roller are always on a fixed line, so that the squeezing angle of the sleeve towards the high-speed roller remains unchanged during the movement of the sleeve, effectively avoiding the leakage of rice due to the change of squeezing angle during the displacement of the sleeve.

[0017] The pressure applied by the rice huller to shaft one is transmitted to the sleeve through two pressure rollers, which reduces the squeezing force between transmission components such as the internal gear ring, gear one, and gear two, thereby improving the transmission stability of the transmission components and reducing their wear. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the low-speed roller. Figure 3 for Figure 2 A schematic diagram of a half-section structure; Figure 4 for Figure 3 Only a left-side view of one set of sleeves and their internal components is retained; Figure 5 for Figure 3 Only one set of sleeves and their internal components are shown in the right view diagram; Figure 6 for Figure 5 A half-section diagram of the mounting plate; Figure 7 A schematic diagram of the first and second transmission mechanisms; Figure 8 for Figure 5 Cross-sectional view of the mounting plate; Figure 9 for Figure 8 A schematic diagram of a half-section structure; Figure 10 for Figure 9 Enlarged schematic diagram of the structure at point A in the middle; Figure 11 This is a schematic diagram illustrating the operation of the present invention.

[0019] The attached diagram lists the components represented by each number as follows: 1: Rice huller; 2: Sleeve; 3: Internal gear ring; 4: Gear 1; 5: Shaft 1; 6: Gear 2; 7: Connecting rod 1; 8: Mounting plate; 9: Through groove; 10: Slider; 11: Shaft 2; 12: Bracket; 13: Connecting groove; 14: Connecting rod 2; 15: Connecting rod 3; 16: Pressure roller; 17: Mounting groove; 18: Motor; 19: Screw; 20: Half gear 1; 21: Bevel gear 1; 22: Bevel gear 2; 23: Gear 3; 24: Half gear 2; 25: Gear 4; 26: Gear 5; 27: Fixed rod 1; 28: Fixed rod 2; 29: Fixed block. Detailed Implementation

[0020] Please see Figure 1-11 The present invention provides a technical solution: a bulk rice grain milling device based on dynamic pressure adjustment, including a rice huller 1, a main equipment for rice hulling, and a low-speed roller in the rice huller 1, wherein the low-speed roller is composed of multiple sleeves 2; The inner wall of each sleeve 2 is fixedly connected with an internal gear ring 3, and each sleeve 2 is provided with a gear 4. The rice huller 1 is driven by a shaft 5. The rice huller 1 can drive a low-speed roller to rotate through the shaft 5 and apply pressure to the rice. All gears 4 are coaxially fixedly connected to the shaft 5. Each gear 4 meshes with a gear 6, and the gear 6 meshes with a corresponding internal gear ring 3. The gear 6 is rotatably connected to a connecting rod 7, the other end of which is rotatably connected to a shaft 5. The gear 4 is externally connected to a sensor, which is used to detect the torque of the gear 4 on the shaft 5. Each of the gears 4 is equipped with an adjustment mechanism, a pressure mechanism, and a control mechanism; the control mechanism is mounted on the shaft 5 and is connected to the sleeve 2 in a transmission manner. The pressure mechanism is used to apply pressure to the sleeve 2; the control mechanism can change the distance between the corresponding sleeve 2 and the high-speed roller in the rice huller 1 according to the torque detected by the sensor; the adjustment mechanism can control the movement of gear 2 6 when the control mechanism controls the movement of the sleeve 2, so that gear 1 4, gear 2 6 and internal gear ring 3 remain meshed.

[0021] Multiple sleeves 2 together form the working part of the low-speed roller, which hulls the rice. During use, the rice huller 1 drives the shaft 5 to rotate and applies pressure to the shaft 5. The shaft 5 transmits the pressure provided by the rice huller 1 to the sleeves 2 through the pressure mechanism, so that the sleeves 2 can apply stable and controllable pressure to the rice during the hulling process. During the rotation of the shaft 5, the sleeves 2 are driven to rotate stably through the gear 4, gear 6 and internal gear ring 3. At the same time, when the thickness of the rice at the sleeve 2 changes, or when the distance between the sleeve 2 and the high-speed roller changes due to wear of the sleeve 2, the sleeves 2 can rotate. The pressure of the sleeve 2 on the rice changes, and further, the torque detected by the sensor changes (the greater the pressure of the sleeve 2 on the rice, the greater the corresponding torque). At this time, the control mechanism changes the distance between the sleeve 2 and the high-speed roller in the rice huller 1 according to the torque detected by the sensor (the torque increases, the distance between the sleeve 2 and the high-speed roller in the rice huller 1 increases, thus reducing the pressure of the sleeve 2 on the rice). At the same time, when the control mechanism controls the sleeve 2 to move, the adjustment mechanism controls the gear 6 to rotate around the shaft 5, thereby changing its own position, so that the gear 4, the gear 6 and the internal gear ring 3 remain meshed.

[0022] This invention uses multiple sleeves 2 to form a low-speed roller, and each sleeve 2 can adjust its distance from the high-speed roller according to its own pressure, thereby achieving dynamic pressure adjustment. At the same time, since the adjustment process of each sleeve 2 is independent of each other, it can effectively avoid the shortcomings of the integrated low-speed roller in the traditional solution, which can only perform overall pressure adjustment. This makes the pressure adjustment of rice by the low-speed roller more precise, thereby effectively improving the rice hulling rate and reducing the rice breakage rate.

[0023] Furthermore, the control mechanism includes a mounting plate 8, and the rice huller 1 is provided with a fixing mechanism for fixing the position of the mounting plate 8. The shaft 5 passes through the mounting plate 8 and is rotatably connected to the mounting plate 8. The mounting plate 8 has a through groove 9, and a slider 10 is slidably connected in the through groove 9. The slider 10 is rotatably connected to a shaft 11 parallel to the shaft 5. The shaft 11 is rotatably connected to a bracket 12. The side wall of the internal gear ring 3 has an annular connecting groove 13, and the bracket 12 is slidably connected to the connecting groove 13. The mounting plate 8 is provided with a driving mechanism for controlling the slider 10 to slide along the through groove 9 according to the torque detected by the sensor.

[0024] The axis of shaft 5, the axis of the high-speed roller, and the trajectory of the through groove 9 are all on the same straight line, thus keeping the axis of sleeve 2 and the axis of the high-speed roller always on the extension line of the trajectory of the through groove 9. When the pressure of the rice being crushed between sleeve 2 and the high-speed roller changes, the torque detected by the sensor also changes positively. Furthermore, the drive mechanism controls the slider 10 to slide along the through groove 9 according to the torque change detected by the sensor, so that the slider 10 drives the sleeve 2, which is fixedly connected to the internal toothed ring 3, to move along the through groove 9 through shaft 2 11, thereby changing the distance between sleeve 2 and the high-speed roller. At the same time, since the axis of sleeve 2 and the axis of the high-speed roller are always on a fixed line, the squeezing angle of sleeve 2 towards the high-speed roller remains unchanged during the movement of sleeve 2, effectively avoiding the leakage of rice due to the change of squeezing angle during the displacement of sleeve 2.

[0025] Furthermore, the pressure mechanism includes a second connecting rod 14, which is fixedly connected to and parallel to the first connecting rod 7. A third connecting rod 15 is rotatably mounted on the shaft 5. Pressure rollers 16 are rotatably connected to the ends of both the second connecting rod 14 and the third connecting rod 15. The positions of the second connecting rod 14 and the third connecting rod 15 are symmetrical about the extension line of the trajectory of the through groove 9. The third connecting rod 15 is driven by a first transmission mechanism, which drives the third connecting rod 15 to always maintain symmetry with the second connecting rod 14.

[0026] Furthermore, the inner wall of the sleeve 2 is provided with annular mounting grooves 17 on both sides of the inner toothed ring 3, and the pressure rollers 16 are respectively rolled in the mounting grooves 17.

[0027] The pressure applied by the rice huller 1 to shaft 5 is transmitted to sleeve 2 through two pressure rollers 16, which reduces the squeezing force between transmission components such as internal gear ring 3, gear 1 4 and gear 2 6, thereby improving the transmission stability of the transmission components and reducing the wear of the transmission components.

[0028] Furthermore, the driving mechanism includes a motor 18, the output shaft of which is fixedly connected to a screw 19. The screw 19 passes through the slider 10 and is threadedly connected to the slider 10. The end of the screw 19 is connected to a second transmission mechanism. The second transmission mechanism is connected to the connecting rod 7 and the first transmission mechanism. The second transmission mechanism can drive the connecting rod 7 to rotate around the shaft 5.

[0029] The motor 18 drives the screw 19 to rotate according to the change in torque detected by the sensor, thereby controlling the slider 10 to slide along the through groove 9, so that the slider 10 drives the sleeve 2 to move along the trajectory of the through groove 9.

[0030] Furthermore, the adjusting mechanism includes a half gear 20, which is rotatably connected to the shaft 5, the connecting rod 7 is fixedly connected to the side wall of the half gear 20, and the second transmission mechanism is connected to the half gear 20 in a transmission manner.

[0031] When the screw 19 rotates and drives the sleeve 2 to move along the track of the through groove 9, the internal gear ring 3 on the inner wall of the corresponding sleeve 2 is displaced relative to the gear 4. During this process, the rotation of the screw 19 drives the gear 6 to rotate around the shaft 5 through the second transmission mechanism, so that the internal gear ring 3, the gear 4 and the gear 6 are meshed, and the gear 4 can stably drive the internal gear ring 3 to rotate.

[0032] Furthermore, the second transmission mechanism includes a first bevel gear 21, which is coaxially and fixedly connected to the end of the screw 19. A second bevel gear 22 is rotatably connected to the mounting plate 8, and the first bevel gear 21 meshes with the second bevel gear 22. A third gear 23 is rotatably disposed on the other end of the mounting plate 8 at the second bevel gear 22, and the third gear 23 is coaxially and fixedly connected to the second bevel gear 22. The third gear 23 meshes with a first half gear 20.

[0033] When screw 19 rotates, it drives bevel gear 22 to rotate through bevel gear 21, which in turn drives half gear 20 to rotate through gear 3 23. Half gear 20 drives connecting rod 7 to rotate around shaft 5, causing gear 2 6 at the end of connecting rod 7 to rotate around gear 4 and maintain meshing with gear 4.

[0034] Furthermore, the first transmission mechanism includes a second half gear 24, which is rotatably connected to a shaft 5. A third connecting rod 15 is fixedly connected to the side wall of the second half gear 24. A fourth gear 25 that meshes with a third gear 23 is rotatably connected to the side wall of the mounting plate 8. A fifth gear 26 is coaxially fixedly connected to the fourth gear 25, and the fifth gear 26 meshes with the second half gear 24.

[0035] During the process of gear 3 23 driving connecting rod 7 to rotate around shaft 5 through transmission components, gear 3 23 drives half gear 24 to rotate synchronously in the opposite direction to half gear 20 through gear 4 25 and gear 5 26. This causes the two pressure rollers 16 to move synchronously in opposite directions within their respective mounting grooves 17. As a result, the positions of the two pressure rollers 16 are always symmetrical about the squeezing direction of the sleeve 2 on the high-speed roller, enabling the two pressure rollers 16 to transmit pressure to the sleeve 2 more stably, thus ensuring stable operation of the equipment.

[0036] Furthermore, the fixing mechanism includes multiple fixing rods 27 and 28 that penetrate all mounting plates 8, and the fixing rods 27 and 28 are fixedly connected to the rice huller 1.

[0037] Furthermore, each of the two fixing rods 28 has a fixing block 29 fixedly connected to its side wall at the bracket 12. The fixing blocks 29 are used to cooperate with each other to clamp the side wall of the bracket 12.

[0038] The mounting plate 8 is fixed relative to the shaft 5 by fixing rod 1 27 and fixing rod 28; the side wall of bracket 12 is clamped by fixing block 29 to prevent bracket 12 from shaking during equipment operation.

Claims

1. Bulk rice milling device based on dynamic adjustment of pressure, comprising a huller (1), the main device for dehulling of paddy, and a low speed roller in the huller (1), characterized in that: The low-speed roller is composed of a plurality of sleeves (2); The inner wall of the sleeve (2) is fixedly connected with an inner gear ring (3), a gear one (4) is arranged in the sleeve (2), and the huller (1) is drivenly connected with a shaft one (5); the huller (1) can drive the low-speed roller to rotate and apply pressure to the rice through the shaft one (5); all the gear ones (4) are coaxially and fixedly connected on the shaft one (5), the gear one (4) is engaged with a gear two (6), and the gear two (6) is engaged with the corresponding inner gear ring (3); The gear two (6) is rotatably provided with a connecting rod one (7), the other end of the connecting rod one (7) is rotatably connected on the shaft one (5), the gear one (4) is externally connected with a sensor, and the sensor is used for detecting the torque of the gear one (4) to the shaft one (5); The gear one (4) is provided with an adjusting mechanism, a pressure mechanism and a control mechanism; the control mechanism is arranged on the shaft one (5) and is drivingly connected with the sleeve (2); The pressure mechanism is used for applying pressure to the sleeve (2); the control mechanism can change the distance between the corresponding sleeve (2) and the high-speed roller in the huller (1) according to the torque detected by the sensor; and the adjusting mechanism can control the gear two (6) to move when the control mechanism controls the sleeve (2) to move, so that the gear one (4), the gear two (6) and the inner gear ring (3) remain engaged.

2. A pressure dynamic adjustment based bulk grain milling device as claimed in claim 1, wherein: The control mechanism comprises a mounting plate (8), the huller (1) is provided with a fixing mechanism, the fixing mechanism is used for fixing the position of the mounting plate (8), the shaft one (5) penetrates through the mounting plate (8) and is rotatably connected with the mounting plate (8), the mounting plate (8) is provided with a through groove (9), a sliding block (10) is slidably connected in the through groove (9), the sliding block (10) is rotatably connected with a shaft two (11) parallel to the shaft one (5), the shaft two (11) is rotatably connected with a support (12), a side wall of the inner gear ring (3) is provided with an annular connecting groove (13), the support (12) is slidably connected with the connecting groove (13), and the mounting plate (8) is provided with a driving mechanism, the driving mechanism is used for controlling the sliding block (10) to slide along the through groove (9) according to the torque detected by the sensor.

3. A pressure dynamic adjustment based bulk grain milling device as claimed in claim 2, wherein: The pressure mechanism comprises a connecting rod two (14), the connecting rod two (14) is fixedly connected with the connecting rod one (7) and parallel to the connecting rod one (7), the shaft one (5) is rotatably provided with a connecting rod three (15), the end portions of the connecting rod two (14) and the connecting rod three (15) are rotatably connected with pressure rollers (16), and the positions of the connecting rod two (14) and the connecting rod three (15) are symmetrical about the extension line of the track of the through groove (9); the connecting rod three (15) is drivingly connected with a first transmission mechanism, and the first transmission mechanism is used for driving the connecting rod three (15) to always keep symmetry with the connecting rod two (14).

4. A pressure dynamic adjustment based bulk grain milling device as claimed in claim 3, wherein: The inner wall of the sleeve (2) is provided with an annular mounting groove (17) on both sides of the inner gear ring (3), and the pressure rollers (16) are respectively rollingly arranged in the mounting grooves (17).

5. The pressure dynamic adjustment based bulk grain milling device of claim 3, wherein: The driving mechanism comprises a motor (18), the output shaft of the motor (18) is fixedly connected with a screw rod (19), the screw rod (19) penetrates through the sliding block (10) and is in threaded transmission connection with the sliding block (10), the end of the screw rod (19) is in transmission connection with a second transmission mechanism, the second transmission mechanism is in transmission connection with the connecting rod one (7) and the first transmission mechanism, and the second transmission mechanism can drive the connecting rod one (7) to rotate around the shaft one (5).

6. A pressure dynamic adjustment based bulk grain milling device as claimed in claim 5, wherein: The adjusting mechanism comprises a half gear one (20), the half gear one (20) is in rotation connection with the shaft one (5), the connecting rod one (7) is fixedly connected with the side wall of the half gear one (20), and the second transmission mechanism is in transmission connection with the half gear one (20).

7. A pressure dynamic adjustment based bulk grain milling device as claimed in claim 6, wherein: The second transmission mechanism comprises a bevel gear one (21), the bevel gear one (21) is coaxially fixedly connected with the end of the screw rod (19), the mounting plate (8) is rotationally connected with a bevel gear two (22), the bevel gear one (21) is in mesh with the bevel gear two (22), the mounting plate (8) is rotationally provided with a gear three (23) at the other end of the bevel gear two (22), the gear three (23) is coaxially fixedly connected with the bevel gear two (22), and the gear three (23) is in mesh with the half gear one (20).

8. A pressure dynamic adjustment based bulk grain milling device according to claim 7, wherein: The first transmission mechanism comprises a half gear two (24), the half gear two (24) is in rotation connection with the shaft one (5), the connecting rod three (15) is fixedly connected to the side wall of the half gear two (24), the side wall of the mounting plate (8) is rotationally connected with a gear four (25) in mesh with the gear three (23), the gear four (25) is coaxially fixedly connected with a gear five (26), and the gear five (26) is in mesh with the half gear two (24).

9. The pressure dynamic adjustment based bulk grain milling device of claim 3, wherein: The fixing mechanism comprises a plurality of fixing rods one (27) and fixing rods two (28) penetrating through all the mounting plates (8), and the fixing rods one (27) and the fixing rods two (28) are fixedly connected with the huller (1).

10. A pressure dynamic adjustment based bulk grain milling device according to claim 9, wherein: The side wall of the fixing rod two (28) is fixedly connected with a fixing block (29) at the support (12), and the fixing block (29) is used for clamping the side wall of the support (12) in cooperation.

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