Automatic water cooling control device of water cooling tower

Abstract

The utility model relates to the field, in particular to an automatic water cooling control device of a water cooling tower, which comprises a water cooling tower body, a filler arranged on the inner side of the water cooling tower body, an air volume adjusting mechanism, a water baffle, a water floating prevention mechanism and a protective pipe, wherein the air volume adjusting mechanism is arranged on the inner side of the water cooling tower body; the water baffle is slidably arranged on the inner side of the water cooling tower body; the water drifting prevention mechanism is arranged on the water cooling tower body; the protective pipe is arranged on the inner side of the filler, and the heat transfer pipe is arranged on the inner side of the protective pipe. Through the arrangement of the air volume adjusting mechanism, the heat transfer pipe transfers heat to the temperature sensing element, so that the temperature sensing element controls the jacking rod to move to control the angle of the fan blade, and the larger the angle of the fan blade is, the larger the operation air volume of the cooling tower is; the smaller the fan blade angle is, the smaller the running air volume of the cooling tower is, so that the running resistance of the fan can be changed, the energy input required by the fan can be reduced, and the power consumption can be effectively saved by properly adjusting the blade angle according to the change of the external air condition or the thermal load.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of cooling tower, especially to a cooling tower automatic cooling control device. BACKGROUND

[0002] The cooling tower, also known as a cooling tower or a cold water tower, is a device that uses incoming wind and water sprayed from above to form convection, expels heat sources, and evaporates part of the water in the convection, thereby removing the corresponding latent heat of evaporation and reducing the temperature of the water. The cooling tower automatic cooling control device is a key component in this process, which is responsible for automatically adjusting the operating state of the cooling tower according to water temperature and other parameters to ensure the cooling effect.

[0003] A cooling tower automatic cooling control device is disclosed in Chinese Patent No. CN205957791U, which includes a cooling device, a temperature sensor, and a control unit. The cooling device and the temperature sensor are installed in the cooling tower. The control unit is connected to the cooling device and includes a switch, a time control branch, a temperature control branch, and a straight-through branch. The time control branch, the temperature control branch, and the straight-through branch are connected in parallel, and then connected to the cooling device through a contactor. The utility model can select the connection branch and the cooling time according to actual needs, avoid the power peak, and effectively save energy.

[0004] However, the above-mentioned disclosed scheme has the following disadvantages: the existing cooling tower automatic cooling control device will form water vapor or fine water droplets from the air inlet after the fan blows and a small amount of water absorbs heat and evaporates, resulting in waste of water resources and increased power consumption of the fan. At the same time, the overcooling of the cooled water will also increase the power consumption of the device, waste resources, and is not environmentally friendly. UTILITY MODEL CONTENTS

[0005] The utility model aims to solve the problem of ineffective treatment of floating water and overcooling of cooled water in the background technology, and proposes a cooling tower automatic cooling control device.

[0006] The technical scheme of the utility model is a cooling tower automatic cooling control device, which includes a cooling tower body and a filler arranged on the inner side of the cooling tower body.

[0007] A wind volume adjusting mechanism is arranged on the inner side of the cooling tower body for adjusting the wind volume blowing into the cooling tower body.

[0008] A water baffle is slidingly arranged on the inner side of the cooling tower body and located between the filler and the wind volume adjusting mechanism. The water baffle is provided with a plurality of through holes, and the floating water generated during the cooling process is blocked at the bottom of the water baffle and adhered to the water baffle.

[0009] The anti-drifting water mechanism is arranged on the body of the water cooling tower and used to drive the water baffle to vibrate.

[0010] The protective tube is arranged on the inner side of the filler, the inner side of the protective tube is provided with the heat transfer tube, the bottom of the heat transfer tube extends out of the bottom of the filler, the bottom of the protective tube is flush with the bottom of the filler, and the protective tube is used to block the hot water above the filler outside the heat transfer tube.

[0011] Preferably, the water inlet assembly comprises a water inlet pipe, a flow distribution box and a spray head.

[0012] The water inlet pipe is arranged on the inner side of the body of the water cooling tower, the flow distribution box is arranged at the end of the water inlet pipe away from the body of the water cooling tower, and the spray head is arranged on the side of the flow distribution box.

[0013] Preferably, the air volume adjusting mechanism comprises an air inlet, a connecting frame, an adjusting assembly and a blowing assembly.

[0014] The air inlet is arranged on the top of the body of the water cooling tower, and the connecting frame is arranged on the inner side of the air inlet.

[0015] The blowing assembly is arranged on the inner side of the connecting frame and used to blow air to the inner side of the body of the water cooling tower.

[0016] The adjusting assembly is arranged at the bottom of the blowing assembly and used to adjust the air volume of the blowing assembly.

[0017] Preferably, the blowing assembly comprises a motor, a rotating shaft one, a mounting disc, a connecting shaft one and a fan blade.

[0018] The motor is arranged on the inner side of the connecting frame, the rotating shaft one is arranged at the output end of the motor, the mounting disc is arranged at the bottom of the rotating shaft one, the connecting shaft one is rotatably arranged on the mounting disc, and the fan blade is arranged on the outer side of the connecting shaft one.

[0019] Preferably, the adjusting assembly comprises a circular gear, a rack, a fixing block and a connecting disc.

[0020] The circular gear is arranged at the end of the connecting shaft one, the rack is arranged on the side of the circular gear and engaged with the circular gear, the fixing block is arranged at the bottom of the mounting disc, the inner side of the fixing block is slidably connected with the outer side of the rack, the connecting disc is arranged at the bottom of the rack, the bottom of the connecting disc is rotatably provided with a sliding disc, the bottom of the sliding disc is provided with a temperature sensing element, and the bottom of the temperature sensing element is provided with the lifting rod.

[0021] Preferably, the anti-drifting water mechanism comprises a rotating shaft two, a bevel gear one, a bevel gear two, a rotating shaft three, a fixing rod and a vibrating assembly.

[0022] The second rotating shaft is arranged on the top of the motor, the bevel gear one is arranged on the top of the second rotating shaft, the bevel gear two is arranged on the side of the bevel gear one and is engaged with the bevel gear one, the third rotating shaft is arranged on the side of the bevel gear two, the fixed rod is rotatably arranged on the outside of the third rotating shaft, the driving wheel is arranged on the end of the third rotating shaft away from the bevel gear two, the driving belt is arranged on the outside of the driving wheel, and the driven wheel is arranged on the side of the driving belt away from the driving wheel.

[0023] The vibration assembly is arranged on the outside of the cooling tower body and is used for driving the water baffle to vibrate.

[0024] Preferably, the vibration assembly comprises the second connecting shaft, the vibration disc, the disc and the connecting block.

[0025] The second rotating shaft is arranged on the axis of the driven wheel, the vibration disc is arranged on the end of the second rotating shaft away from the driven wheel, the disc is arranged below the vibration disc, the connecting block is arranged on the side of the disc, the upper and lower sides of the connecting block are symmetrically provided with springs, the top of the spring is provided with the mounting block, and the side of the spring is provided with the shielding plate.

[0026] Compared with the prior art, the utility model has the advantages of the following beneficial technical effects:

[0027] 1. Through the setting of the air volume adjusting mechanism, the heat pipe transmits heat to the temperature sensing element, so that the temperature sensing element controls the lifting rod to move to control the angle of the fan blade, the greater the angle of the fan blade, the greater the running air volume of the cooling tower; the smaller the angle of the fan blade, the smaller the running air volume of the cooling tower, so that the running resistance of the fan can be changed, the energy input required by the fan can be reduced, and according to the change of external air conditions or heat load, the blade angle can be adjusted appropriately, so that the power consumption can be effectively saved, and the energy consumption of the refrigeration equipment can be avoided due to excessive cooling of water;

[0028] 2. Through the setting of the anti-drifting water mechanism, the water droplets and water vapor blown up by the fan can be blocked at the bottom by the water baffle, and the motor drives the water baffle to vibrate, so that the collected drifting water is shaken off again to the filler for cooling and collection, so that the part of the drifting water can be effectively blocked, and the water resource waste can be reduced, and the collected drifting water can be shaken off again to the filler through vibration, so that the water utilization rate can be improved, and the wet area of the filler surface can be increased, so that the heat exchange efficiency is improved, and the cooling efficiency is better under the same power consumption. Since the anti-drifting water mechanism and the air volume adjusting mechanism share one motor, no additional energy consumption is generated, and the energy consumption is further reduced. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a structural schematic view of one embodiment of the utility model;

[0030] Figure 2for Figure 1 Internal structure diagram;

[0031] Figure 3 This is a schematic diagram of the air volume regulating mechanism;

[0032] Figure 4 This is a schematic diagram of the internal structure of the air volume regulating mechanism;

[0033] Figure 5 A schematic diagram of the anti-drift mechanism;

[0034] Figure 6 A partial structural diagram of the anti-water drift mechanism.

[0035] Reference numerals: 1. Cooling tower body; 2. Water collection tray; 3. Water outlet pipe; 401. Air inlet; 402. Connecting frame; 403. Motor; 404. Rotating shaft one; 405. Mounting plate; 406. Temperature sensing element; 407. Heat transfer tube; 408. Protective tube; 409. Connecting shaft one; 410. Fan blade; 411. Circular gear; 412. Rack; 413. Fixing block; 414. Connecting plate; 415. Sliding plate; 416. Lifting rod; 50 1. Rotating shaft two; 502. Bevel gear one; 503. Bevel gear two; 504. Rotating shaft three; 505. Fixed rod; 506. Driving wheel; 507. Transmission belt; 508. Driven wheel; 509. Connecting shaft two; 510. Vibrating plate; 511. Disc; 512. Connecting block; 513. Baffle plate; 514. Spring; 515. Mounting block; 516. Water baffle plate; 6. Packing material; 701. Inlet pipe; 702. Diverter box; 703. Nozzle. Detailed Implementation

[0036] Example 1, as Figures 1-4 As shown, the present invention proposes an automatic cooling water control device for a cooling tower, comprising a cooling tower body 1, packing material 6 disposed inside the cooling tower body 1, a water collection pan 2 disposed at the bottom of the cooling tower body 1, a water outlet pipe 3 disposed on the side of the water collection pan 2, an air volume regulating mechanism, a baffle plate 516, an anti-drift mechanism, and a protective pipe 408.

[0037] The air volume regulating mechanism is located inside the cooling tower body 1 and is used to regulate the air volume blown into the cooling tower body 1.

[0038] The baffle plate 516 is slidably disposed on the inner side of the cooling tower body 1 and is located between the packing 6 and the air volume regulating mechanism. The baffle plate 516 is provided with multiple through holes. The water drift generated during the cooling process is blocked at the bottom by the baffle plate 516 and adheres to the baffle plate 516.

[0039] The anti-drift mechanism is installed on the cooling tower body 1 and is used to drive the water baffle 516 to vibrate;

[0040] The protective tube 408 is arranged at the inner side of the filler 6, the inner side of the protective tube 408 is provided with the heat transfer pipe 407, the bottom of the heat transfer pipe 407 extends out of the bottom of the filler 6, the bottom of the protective tube 408 is flush with the bottom of the filler 6, and the protective tube 408 is used for blocking the hot water above the filler 6 outside the heat transfer pipe 407;

[0041] The water inlet assembly comprises a water inlet pipe 701, a flow distribution box 702 and a spray head 703; the water inlet pipe 701 is arranged at the inner side of the cooling tower body 1, the flow distribution box 702 is arranged at the end of the water inlet pipe 701 away from the cooling tower body 1, the outer side of the water inlet pipe 701 is slidably connected with the inner side of the water baffle 516, the spray head 703 is arranged at the side of the flow distribution box 702, and a plurality of spray heads 703 are equidistantly arranged on the flow distribution box 702; water enters the water inlet pipe 701, then stays in the flow distribution box 702, is evenly distributed to the spray head 703 from the flow distribution box 702 and is sprayed from the spray head 703, so that the water is evenly sprayed to the filler 6.

[0042] The air volume regulation mechanism includes an air inlet 401, a connecting frame 402, an adjustment component, and a blowing component; the air inlet 401 is located at the top of the cooling tower body 1, and the connecting frame 402 is located inside the air inlet 401; the blowing component is located inside the connecting frame 402 and is used to supply air to the inside of the cooling tower body 1; the adjustment component is located at the bottom of the blowing component and is used to adjust the blowing air volume of the blowing component. The air blowing assembly includes a motor 403, a rotating shaft 404, a mounting plate 405, a connecting shaft 409, and fan blades 410. The motor 403 is located inside the connecting frame 402, the rotating shaft 404 is located at the output end of the motor 403, the mounting plate 405 is located at the bottom of the rotating shaft 404, the connecting shaft 409 is rotatably mounted on the mounting plate 405, and four connecting shafts 409 are arranged in a ring around the mounting plate 405. The fan blades 410 are located outside the connecting shaft 409. When the motor 403 is started, the motor 403 drives the rotating shaft 404 to rotate, the rotating shaft 404 drives the mounting plate 405 to rotate, and the mounting plate 405 drives the fan blades 410 to rotate through the connecting shaft 409, thereby blowing air into the cooling tower body 1. The adjustment assembly includes a spur gear 411, a rack 412, a fixing block 413, and a connecting plate 414. The spur gear 411 is located at the end of the connecting shaft 409, and the rack 412 is located on the side of the spur gear 411 and meshes with it. The fixing block 413 is located at the bottom of the mounting plate 405, and the inner side of the fixing block 413 and the outer side of the rack 412 are slidably connected. The connecting plate 414 is located at the bottom of the rack 412, and a sliding plate 415 is rotatably mounted on the bottom of the connecting plate 414. A lifting rod 416 is located at the bottom of the sliding plate 415, and a temperature sensing element 406 is located at the bottom of the lifting rod 416. The bottom of the temperature sensing element 406 is connected to the top of the protective tube 408. Because the sliding plate 415 and the connecting plate 414 are rotatably connected, the mounting plate 405 and the fan... When the blade 410 rotates, it drives the rack 412 and the connecting plate 414 to rotate, but does not drive the lifting rod 416 to rotate. In its natural state, the angle between the fan blade 410 and the axis is 45 degrees. The heat transfer tube 407 transfers heat to the temperature sensing element 406. When the water in the water collection pan 2 is not cooled enough, the temperature sensing element 406 drives the lifting rod 416 to rise. The lifting rod 416 rises through the sliding plate 415 and the connecting plate 414. The connecting plate 414 drives the rack 412 to slide and rise on the fixed block 413, thereby driving the spherical gear 411 to rotate counterclockwise, which increases the angle between the fan blade 410 and the axis, thereby increasing the air volume and enhancing the cooling effect. When the water temperature in the water collection pan 2 is low, the lifting rod 416 descends, the angle between the fan blade 410 and the axis decreases, the air volume decreases, and the cooling effect is reduced.

[0043] Example 2, as Figures 5-6 As shown, the present invention proposes an automatic cooling water control device for a cooling tower. Compared with Embodiment 1, this embodiment details the structure of the anti-drift mechanism.

[0044] The anti-drifting water mechanism comprises a rotating shaft 2 501, a bevel gear 1 502, a bevel gear 2 503, a rotating shaft 3 504, a fixed rod 505 and a vibration assembly; the rotating shaft 2 501 is arranged on the top of the motor 403, the bevel gear 1 502 is arranged on the top of the rotating shaft 2 501, the bevel gear 2 503 is arranged on the side of the bevel gear 1 502 and is engaged with the bevel gear 1 502, the rotating shaft 3 504 is arranged on the side of the bevel gear 2 503, the fixed rod 505 is rotatably arranged on the outside of the rotating shaft 3 504, the end of the rotating shaft 3 504 away from the bevel gear 2 503 is provided with a driving wheel 506, the outside of the driving wheel 506 is provided with a transmission belt 507, the side of the transmission belt 507 away from the driving wheel 506 is provided with a driven wheel 508, the motor 403 drives the rotating shaft 2 501 to rotate, the rotating shaft 2 501 drives the bevel gear 2 503 to rotate through the bevel gear 1 502, the bevel gear 2 503 drives the driving wheel 506 to rotate through the rotating shaft 3 504, and the driving wheel 506 drives the driven wheel 508 to rotate through the transmission belt 507; the vibration assembly is arranged on the outside of the cooling tower body 1 and is used for driving the water baffle 516 to vibrate. The vibration assembly comprises a connecting shaft 2 509, a vibration disc 510, a disc 511 and a connecting block 512; the rotating shaft 2 501 is arranged at the center of the driven wheel 508, the vibration disc 510 is arranged at the end of the rotating shaft 2 501 away from the driven wheel 508, the end of the rotating shaft 2 501 away from the vibration disc 510 is rotatably connected to the outside of the cooling tower body 1, the disc 511 is located below the vibration disc 510, the connecting block 512 is arranged on the side of the disc 511, the upper and lower sides of the connecting block 512 are symmetrically provided with springs 514, the top of the spring 514 is provided with a mounting block 515, the side of the mounting block 515 is connected to the outside of the cooling tower body 1, the side of the spring 514 is provided with a shielding plate 513, the shielding plate 513 is in close contact with the outside of the cooling tower body 1, the driven wheel 508 drives the vibration disc 510 to rotate through the connecting shaft 2 509, the outside of the vibration disc 510 is annularly provided with a plurality of protruding ends, one side of the protruding end is an arc surface and the other side is a vertical surface, when the arc surface contacts the disc 511, the disc 511 is pressed downward, at this time, the spring 514 is compressed, when the arc surface is separated from the disc 511, the disc 511 rapidly rebounds under the elastic force of the spring 514 due to the existence of the vertical surface, so that vibration is realized, and the disc 511 drives the water baffle 516 to vibrate through the connecting block 512.

[0045] In summary, when the utility model is used, hot water enters from the water inlet pipe 701, and then is distributed to the spray head 703 from the distribution box 702, and is sprayed to the filler 6 from the spray head 703, at the same time, the motor 403 is started, the motor 403 drives the rotating shaft one 404 to rotate, the rotating shaft one 404 drives the mounting disc 405 to rotate, the mounting disc 405 drives the fan blade 410 to rotate through the connecting shaft one 409, so that the cooling tower body 1 is blown, the heat pipe 407 transmits heat to the temperature sensing element 406, when the water in the water collecting disc 2 is not cooled enough, the temperature sensing element 406 drives the jacking rod 416 to rise, the jacking rod 416 rises through the sliding disc 415 and the connecting disc 414, the connecting disc 414 drives the rack 412 to slide on the fixed block 413 and rise, so that the circular gear 411 is counterclockwise, the angle of the fan blade 410 and the axis is increased, so that the air volume is increased and the cooling effect is enhanced, when the water temperature in the water collecting disc 2 is low, the jacking rod 416 is lowered, the angle of the fan blade 410 and the axis is reduced, the air volume is reduced and the cooling effect is reduced, at the same time, the motor 403 drives the rotating shaft two 501 to rotate, the rotating shaft two 501 drives the bevel gear two 503 to rotate through the bevel gear one 502, the bevel gear two 503 drives the driving wheel 506 to rotate through the rotating shaft three 504, the driving wheel 506 drives the driven wheel 508 to rotate through the transmission belt 507, the driven wheel 508 drives the vibration disc 510 to rotate through the connecting shaft two 509, when the arc surface of the vibration disc 510 contacts the disc 511, the disc 511 is pressed downward, when the arc surface is separated from the disc 511, due to the existence of the vertical section, the disc 511 will rebound rapidly under the action of the spring 514, so that vibration is realized, the disc 511 drives the water baffle 516 to vibrate through the connecting block 512, the water baffle 516 shakes the adhered water to the filler 6 and cools again, finally, the cooled water flows into the water collecting disc 2, and the water in the water collecting disc 2 can be pumped out through the water outlet pipe 3.

[0046] The embodiments of the utility model are described in detail above combined with the drawings, but the utility model is not limited to this, within the knowledge range of the technical personnel in the technical field, various changes can be made without departing from the purpose of the utility model.

Claims

1. A cooling water tower automatic cooling water control device, comprising a cooling water tower body (1) and a filler (6) arranged on the inner side of the cooling water tower body (1); characterized in that, Also include: The air volume adjusting mechanism is arranged on the inner side of the cooling tower body (1), and is used for adjusting the air volume blown into the cooling tower body (1); The baffle (516) is slidably arranged on the inner side of the cooling tower body (1) and located between the filler (6) and the air volume adjusting mechanism, a plurality of through holes are arranged on the baffle (516), and the floating water generated during the cooling water process is blocked at the bottom of the baffle (516) and adhered to the baffle (516); The anti-floating water mechanism is arranged on the cooling tower body (1), and is used for driving the baffle (516) to vibrate; And the protection pipe (408) is arranged on the inner side of the filler (6), the inner side of the protection pipe (408) is provided with a heat transfer pipe (407), the bottom of the heat transfer pipe (407) extends out of the bottom of the filler (6), the bottom of the protection pipe (408) is flush with the bottom of the filler (6), and the protection pipe (408) is used for blocking the hot water above the filler (6) outside the heat transfer pipe (407).

2. The water cooling tower automatic water cooling control device according to claim 1, characterized in that, The water inlet assembly includes a water inlet pipe (701), a shunt box (702) and a spray head (703); The water inlet pipe (701) is arranged on the inner side of the cooling tower body (1), the shunt box (702) is arranged on the end of the water inlet pipe (701) away from the cooling tower body (1), and the spray head (703) is arranged on the side of the shunt box (702).

3. The water cooling tower automatic water cooling control device according to claim 1, characterized in that, The air volume adjusting mechanism includes an air inlet (401), a connecting frame (402), an adjusting assembly and a blowing assembly; The air inlet (401) is arranged on the top of the cooling tower body (1), and the connecting frame (402) is arranged on the inner side of the air inlet (401); The blowing assembly is arranged on the inner side of the connecting frame (402) and is used for blowing air to the inner side of the cooling tower body (1); The adjusting assembly is arranged at the bottom of the blowing assembly and is used for adjusting the blowing air volume of the blowing assembly.

4. The water cooling tower automatic water cooling control device according to claim 3, characterized by The blowing assembly includes a motor (403), a rotating shaft (404), a mounting disc (405), a connecting shaft (409) and a fan blade (410); The motor (403) is arranged on the inner side of the connecting frame (402), the rotating shaft (404) is arranged on the output end of the motor (403), the mounting disc (405) is arranged at the bottom of the rotating shaft (404), the connecting shaft (409) is rotatably arranged on the mounting disc (405), and the fan blade (410) is arranged on the outer side of the connecting shaft (409).

5. The water cooling tower automatic water cooling control device according to claim 4, characterized in that, The adjusting assembly includes a circular gear (411), a rack (412), a fixed block (413) and a connecting disc (414); The circular gear (411) is arranged at the end of the connecting shaft (409), the rack (412) is arranged at the side of the circular gear (411) and engages with the circular gear (411), the fixed block (413) is arranged at the bottom of the mounting disc (405), the inner side of the fixed block (413) and the outer side of the rack (412) are in sliding connection, the connecting disc (414) is arranged at the bottom of the rack (412), the bottom of the connecting disc (414) is rotatably provided with the sliding disc (415), the bottom of the sliding disc (415) is provided with the jacking rod (416), and the bottom of the jacking rod (416) is provided with the temperature sensing element (406).

6. The water cooling tower automatic water cooling control device according to claim 4, characterized in that, The anti-drifting water mechanism comprises a rotating shaft two (501), a bevel gear one (502), a bevel gear two (503), a rotating shaft three (504), a fixed rod (505) and a vibration assembly. The rotating shaft two (501) is arranged at the top of the motor (403), the bevel gear one (502) is arranged at the top of the rotating shaft two (501), the bevel gear two (503) is arranged at the side of the bevel gear one (502) and engages with the bevel gear one (502), the rotating shaft three (504) is arranged at the side of the bevel gear two (503), the fixed rod (505) is rotatably arranged at the outer side of the rotating shaft three (504), and the end, away from the bevel gear two (503), of the rotating shaft three (504) is provided with a driving wheel (506); the outer side of the driving wheel (506) is provided with a transmission belt (507), and the side, away from the driving wheel (506), of the transmission belt (507) is provided with a driven wheel (508). The vibration assembly is arranged at the outer side of the water cooling tower body (1) and is used for driving the water baffle (516) to vibrate.

7. The water cooling tower automatic water cooling control device according to claim 6, characterized in that, The vibration assembly comprises a connecting shaft two (509), a vibration disc (510), a disc (511) and a connecting block (512). The rotating shaft two (501) is arranged at the axis of the driven wheel (508), the vibration disc (510) is arranged at the end, away from the driven wheel (508), of the rotating shaft two (501), the disc (511) is located below the vibration disc (510), the connecting block (512) is arranged at the side of the disc (511), the upper and lower sides of the connecting block (512) are symmetrically provided with springs (514), the top of each spring (514) is provided with a mounting block (515), and the side of each spring (514) is provided with a shielding plate (513).

Images