Ammonium chloride salt filtering and discharging device
By designing an automated filtration and discharge device, the problems of ammonia gas escape and manual operation in ammonium chloride filtration were solved, achieving a highly efficient and safe filtration process and reducing environmental pollution and labor costs.
Patent Information
- Application Number
- CN202423273275.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2034-12-30
AI Technical Summary
Traditional filtration devices release ammonia gas during the filtration of ammonium chloride salts, causing environmental pollution and endangering the health of workers, and require a large amount of manual operation.
A filtration and discharge device comprising a filter cylinder, a filter screen assembly, and a pull-out drive mechanism was designed to achieve automated filtration and reduce manual operation, and to prevent ammonia gas from spreading through negative pressure filtration and automated discharge.
It achieves effective ammonia collection, reduces environmental pollution and manual operation, improves filtration efficiency, reduces labor requirements, and protects the health of staff.
Smart Images
Figure CN223747050U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of ammonium chloride salt production equipment, and specifically relates to a filtering and discharging device for ammonium chloride salt. BACKGROUND
[0002] In the production of silane coupling agent products, the ammonium chloride solid salt produced after the synthesis reaction needs to be filtered and separated. The traditional filtering device mostly uses suction filtration or pressure filtration to filter and separate, and the ammonium chloride salt produced in the filtering process needs to be manually packed. Since the ammonia gas is dispersed around when the ammonium chloride solid salt is discharged, the ammonia gas not only pollutes the environment but also harms the health of the workers.
[0003] Therefore, a filtering device capable of avoiding the dispersion of ammonia gas and reducing manual operation is needed to improve the filtering and discharging efficiency and reduce environmental pollution. UTILITY MODEL CONTENT
[0004] The utility model needs to solve the technical problem: provide a kind of filtering and discharging device for ammonium chloride salt, its structure is simple and reliable, can effectively avoid the dispersion of ammonia gas, greatly reduce manual operation, filter screen replacement is also extremely convenient.
[0005] To solve the above problems, the utility model adopts the technical scheme: a kind of filtering and discharging device for ammonium chloride salt, comprising: filter cylinder, filter cylinder includes the upper and lower settings upper cylinder body and lower cylinder body, the top of upper cylinder body is provided with the feeding pipe with feeding control valve and the upper cylinder exhaust pipe with the upper cylinder exhaust valve, the bottom of lower cylinder body is provided with the liquid discharge pipe with liquid discharge control valve, filter salt mechanism is provided between upper cylinder body and lower cylinder body, filter salt mechanism includes: upper connecting seat and lower connecting seat, upper connecting seat is provided with upper connecting cylinder, the upper end of upper connecting cylinder is sealed and fixed with the lower end of upper cylinder, lower connecting seat is provided with lower connecting through hole, and lower connecting seat is sealed and fixed with the upper end of lower cylinder;Filter screen assembly is provided between upper connecting seat and lower connecting seat, and filter screen assembly includes: filter screen support plate, the top of filter screen support plate is provided with downward concave circular groove, the bottom of circular groove is filter screen hole plate, filter screen is arranged on filter screen hole plate in circular groove, upper cylinder, lower cylinder, upper connecting cylinder, lower connecting through hole, circular groove coaxial, upper cylinder, upper connecting cylinder, filter screen, filter screen hole plate, lower connecting through hole, lower cylinder are sequentially communicated, and the top and bottom of filter screen support plate outside circular groove are sealed between the bottom of upper connecting seat and the top of lower connecting seat respectively;
[0006] Three of the four sides of the upper connecting seat and the lower connecting seat are fixed to each other, and the other side forms a pull-out port side; the filter screen support plate at the pull-out port side is connected with a pull-out driving mechanism, the pull-out driving mechanism can drive the filter screen support plate to move outward until the filter screen is completely pulled out from between the upper connecting seat and the lower connecting seat, or can drive the filter screen support plate to move inward until the circular recess returns to a position coaxial with the upper cylinder, the lower cylinder, the upper connecting cylinder and the lower connecting through hole, and the top and bottom of the filter screen support plate are again in a sealed state with the upper connecting seat and the lower connecting seat;
[0007] An upper connecting cylinder above the filter screen support plate is provided with a salt outlet, and the salt outlet is connected with a salt outlet assembly; the upper cylinder is provided with a stirring paddle for conveying the remaining ammonium chloride salt to the salt outlet.
[0008] Further, the filter discharge device for ammonium chloride salt, wherein the salt outlet assembly comprises a salt outlet pipe, a discharge screw is arranged in the salt outlet pipe, a discharge motor for driving the discharge screw to rotate is arranged at the outer end of the salt outlet pipe, a discharge port is arranged at the bottom of the outer end of the salt outlet pipe, and a salt outlet control valve is arranged between the inner end of the salt outlet pipe and the salt outlet; the discharge port is connected with a salt storage tank, an electronic scale is arranged at the bottom of the salt storage tank, and a salt storage tank emptying pipe with a salt storage tank emptying control valve is arranged at the upper end of the salt storage tank.
[0009] Further, the filter discharge device for ammonium chloride salt, wherein the liquid discharge pipe is connected to a filtrate receiving tank, a flow meter is further arranged on the liquid discharge pipe, a vacuum pipe with a negative pressure pipe control valve is arranged on the filtrate receiving tank, and the vacuum pipe is connected with a negative pressure generating device.
[0010] Further, the filter discharge device for ammonium chloride salt, wherein the upper end of the upper connecting cylinder is welded and fixedly sealed with the upper end of the upper cylinder, and the bottom of the lower connecting seat is welded and fixedly sealed with the upper end of the lower cylinder.
[0011] Further, the filter discharge device for ammonium chloride salt, wherein the inner wall of the upper connecting cylinder is provided with a tapered inner wall for downward material guiding.
[0012] Further, the filter discharge device for ammonium chloride salt, wherein the sealing connection structure between the filter screen support plate and the upper connecting seat and the lower connecting seat comprises: a ring-shaped sealing groove is arranged outside the top and bottom of the filter screen support plate, a sealing ring is arranged in the sealing groove, and the top and bottom of the filter screen support plate are respectively sealed with the bottom of the upper connecting seat and the top of the lower connecting seat through the sealing ring.
[0013] Further, the filter discharge device of the ammonium chloride salt, wherein the pulling driving mechanism is a cylinder, the piston rod of the cylinder is connected with one end of the filter screen support plate, and the cylinder body is installed on the support outside the filter cylinder.
[0014] Further, the filter discharge device of the ammonium chloride salt, wherein the pulling driving mechanism is a cylinder, the piston rod of the cylinder is connected with one end of the filter screen support plate, and the cylinder body is installed on the support outside the filter cylinder.
[0015] Further, the filter discharge device of the ammonium chloride salt, wherein the pulling driving mechanism is a cylinder, the piston rod of the cylinder is connected with one end of the filter screen support plate, and the cylinder body is installed on the support outside the filter cylinder.
[0016] Further, the filter discharge device of the ammonium chloride salt, wherein the pulling driving mechanism is a cylinder, the piston rod of the cylinder is connected with one end of the filter screen support plate, and the cylinder body is installed on the support outside the filter cylinder.
[0017] The filter discharge device of the ammonium chloride salt has the advantages that the structure is simple, the manufacturing cost is low, the ammonia gas can be effectively reduced, the whole filtering process can be automated, the manual operation is greatly reduced, the filter screen replacement can greatly reduce the labor demand, and the replacement is convenient and simple. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 The filter discharge device of the ammonium chloride salt has the advantages that the structure is simple, the manufacturing cost is low, the ammonia gas can be effectively reduced, the whole filtering process can be automated, the manual operation is greatly reduced, the filter screen replacement can greatly reduce the labor demand, and the replacement is convenient and simple.
[0019] Figure 2 The filter discharge device of the ammonium chloride salt has the advantages that the structure is simple, the manufacturing cost is low, the ammonia gas can be effectively reduced, the whole filtering process can be automated, the manual operation is greatly reduced, the filter screen replacement can greatly reduce the labor demand, and the replacement is convenient and simple. DETAILED DESCRIPTION
[0020] The filter discharge device of the ammonium chloride salt has the advantages that the structure is simple, the manufacturing cost is low, the ammonia gas can be effectively reduced, the whole filtering process can be automated, the manual operation is greatly reduced, the filter screen replacement can greatly reduce the labor demand, and the replacement is convenient and simple.
[0021] As Figure 1 , Figure 2As shown, a filtering device for ammonium chloride salt includes a filter cylinder 1, which includes an upper cylinder 11 and a lower cylinder 12 arranged in sequence, the top of the upper cylinder 11 is provided with a feeding pipe 13 with a feeding control valve 131 and an upper cylinder exhaust pipe 18 with an upper cylinder exhaust valve 181. The bottom of the lower cylinder 12 is provided with a liquid discharge pipe 14 with a liquid discharge control valve 141. In this embodiment, the liquid discharge pipe 14 is connected to a filtrate receiving tank 2, and the liquid discharge pipe 14 is also provided with a flow meter 142, and the filtrate receiving tank 2 is provided with a vacuum pipe 21 with a negative pressure pipe control valve 211, which is connected to a negative pressure generating device.
[0022] A filter salt mechanism is arranged between the upper cylinder 11 and the lower cylinder 12, which includes an upper connecting seat 3 and a lower connecting seat 4, the upper connecting seat 3 is provided with an upper connecting cylinder 31, and the upper end of the upper connecting cylinder 31 is sealingly fixed to the lower end of the upper cylinder 11. The lower connecting seat 4 is provided with a lower connecting through hole 41, and the lower connecting seat 4 is sealingly fixed to the upper end of the lower cylinder 12. In this embodiment, the upper end of the upper connecting cylinder 31 is sealingly fixed to the lower end of the upper cylinder 11 by welding, and the bottom of the lower connecting seat 4 is sealingly fixed to the upper end of the lower cylinder 12 by welding.
[0023] A filter screen assembly is arranged between the upper connecting seat 3 and the lower connecting seat 4, which includes a filter screen support plate 5, the top of the filter screen support plate 5 is provided with a downwardly recessed circular groove 51, the bottom of the circular groove 51 is a filter screen hole plate 52, a filter screen 53 is arranged on the filter screen hole plate 52 in the circular groove 51, the upper cylinder 11, the lower cylinder 12, the upper connecting cylinder 31, the lower connecting through hole 41, and the circular groove 51 are coaxial, the upper cylinder 11, the upper connecting cylinder 31, the filter screen 53, the filter screen hole plate 52, the lower connecting through hole 41, and the lower cylinder 12 are sequentially communicated, and the top and bottom of the filter screen support plate 5 outside the circular groove 51 are sealingly arranged between the bottom of the upper connecting seat 3 and the top of the lower connecting seat 4, respectively. In this embodiment, a ring-shaped sealing groove 54 is arranged outside the top and bottom of the filter screen support plate 5 outside the circular groove 51, a sealing ring 541 is arranged in the sealing groove 54, and the top and bottom of the filter screen support plate 5 are sealingly arranged between the bottom of the upper connecting seat 3 and the top of the lower connecting seat 4 through the sealing ring 541, respectively.
[0024] In order to prevent material accumulation, a conical inner wall 32 is arranged on the inner wall of the upper connecting cylinder 31, which can guide the material downward.
[0025] Three of the four side edges of the upper connecting seat 3 and the lower connecting seat 4 are fixed to each other, and the other side edge forms a pull-out opening side. Figure 2As shown, in this embodiment, the three sides between the upper connecting seat 3 and the lower connecting seat 4 are fixed by bolt locking. The bolt locking not only has simple structure, but also can effectively adjust the sealing and pressing force between the filter screen support plate 5 and the upper connecting seat 3 and the lower connecting seat 4. The bolt holes 50 on each side of the upper connecting seat 3 and the lower connecting seat 4 are as evenly distributed as possible.
[0026] The filter screen support plate 5 on the pull-out side is connected with the pull-out driving mechanism. The pull-out driving mechanism can drive the filter screen support plate 5 to move outward until the filter screen 53 is completely pulled out from between the upper connecting seat 3 and the lower connecting seat 4, or can drive the filter screen support plate 5 to move inward until the circular groove 51 returns to the position coaxial with the upper cylinder body 11, the lower cylinder body 12, the upper connecting cylinder body 31 and the lower connecting through hole 41, and the top and bottom of the filter screen support plate 5 are sealed with the upper connecting seat 3 and the lower connecting seat 4 again.
[0027] The pull-out driving mechanism is a gas cylinder 6. The piston rod of the gas cylinder 6 is connected with the filter screen support plate 5. The cylinder body of the gas cylinder 6 is installed on the support 7 outside the filter cylinder body 1. Figure 1 Figure 2 The support 7 is only schematic in the figure. The support 7 is fixedly connected with one end of a pair of parallel support rods 8. The pair of support rods 8 are respectively located on both sides of the piston rod of the gas cylinder 6. The other end of the support rod 8 is fixedly connected with the lower connecting seat 4. A stop rod 9 is arranged above each support rod 8. Both ends of each stop rod 9 are fixedly connected with the support 7 and the upper connecting seat 3. When the filter screen support plate 5 moves outward, both ends of the filter screen support plate 5 are located in the gap between the support rod 8 and the stop rod 9, and the filter screen support plate 5 is supported on the two support rods 8. The support rod 8 plays an effective supporting role on the filter screen support plate 5. The gap formed between the support rod 8 and the stop rod 9 plays a good guiding role on the filter screen support plate 5. In addition, in this embodiment, the bottom of the upper connecting seat 3 is provided with a positioning stop plate 33. When the gas cylinder 6 drives the filter screen support plate 5 to move inward to be blocked by the positioning stop plate 33, the filter screen support plate 55 returns to the state that the circular groove 51 on the filter screen support plate 55 is coaxial with the upper cylinder body 11, the lower cylinder body 12, the upper connecting cylinder body 31 and the lower connecting through hole 41, and the filter screen support plate 55 is sealed with the upper connecting seat 3 and the lower connecting seat 4.
[0028] A salt outlet 30 is formed on the upper connecting cylinder 31 above the filter screen support plate 5, and an outlet assembly is connected to the salt outlet 30. The outlet assembly comprises an outlet pipe 15, and a discharge screw 16 is arranged in the outlet pipe 15. An outlet motor 17 is arranged at the outer end of the outlet pipe 15 to drive the discharge screw 16 to rotate. A discharge outlet 151 is arranged at the bottom of the outer end of the outlet pipe 15, and a discharge control valve 152 is arranged between the inner end of the outlet pipe 15 and the salt outlet 30. The discharge outlet 151 is connected to a salt storage tank 20, and an electronic scale 30 is arranged at the bottom of the salt storage tank 20. A salt storage tank emptying pipe 201 with a salt storage tank emptying control valve 202 is arranged at the upper end of the salt storage tank 20.
[0029] A stirring paddle 10 is arranged in the upper cylinder 11 above the filter screen 5, and the stirring paddle 10 is driven to stir by a stirring motor 101. The rotation of the stirring paddle 10 can continuously transport the ammonium chloride salt left after filtration to the salt outlet 30.
[0030] The working principle is as follows: In order to facilitate automatic control, the feed control valve 131, the upper cylinder exhaust valve 181, the liquid discharge control valve 141, the flow meter 142, the discharge control valve 152, the electronic scale 30, the salt storage tank emptying control valve 202, and the discharge motor 17 are all in communication with the PLC controller 40.
[0031] When it is necessary to filter and separate the material liquid containing ammonium chloride salt, the PLC controller 40 controls the feed control valve 131 to open, and the material liquid enters the upper cylinder 11 through the feed pipe 13. After the feeding is completed, the PLC controller 40 controls the feed control valve 131 to close. The PLC controller 40 controls the liquid discharge control valve 141 and the negative pressure pipeline control valve 211 to open, and the suction filtration is performed under the action of negative pressure. The material liquid flows into the lower cylinder 12 through the filter screen 53, the filter screen hole plate 52, and the lower connecting through hole 41 under the filtering action of the filter screen 53, and is then stored in the filtrate receiving tank 2 through the liquid discharge pipe 14. The ammonium chloride salt is intercepted by the filter screen 53. When the flow meter 142 detects that the flow is 0, the PLC controller 40 controls the liquid discharge control valve 141 and the negative pressure pipeline control valve 211 to close.
[0032] Then the PLC controller 40 controls the upper cylinder exhaust valve 181, the salt outlet control valve 152 and the salt storage tank emptying control valve 202 to open, controls the stirring motor 101 to drive the stirring paddle 10 to rotate, and controls the discharge motor 17 to drive the discharge screw 16 to rotate. Under the stirring of the stirring paddle 10, the ammonium chloride salt retained by the filter screen is continuously pushed into the salt outlet 30, then into the salt outlet pipe 15, and continuously enters the salt storage tank 20 through the discharge port 151 under the action of the discharge screw 16. During the process, the gas-ammonia in the filter cylinder 1 is discharged from the upper cylinder exhaust pipe 18, and the ammonia in the salt storage tank 20 is discharged from the salt storage tank emptying pipe 201. The electronic scale 30 monitors the mass change of the salt storage tank 20 in real time, and when the mass of the salt storage tank 20 does not change, it means that the ammonium chloride salt is discharged. At this time, the PLC controller 40 controls the upper cylinder exhaust valve 181, the salt outlet control valve 152 and the salt storage tank emptying control valve 202 to close, and controls the stirring motor 101 and the discharge motor 17 to stop working. The whole filtering and discharging work greatly reduces manual operation, greatly improves the filtering and discharging efficiency, and the ammonia gas is not scattered but guided to be discharged, which can effectively improve the working environment and avoid the working environment from being polluted, so that the working environment is more friendly to the workers.
[0033] When the filter screen needs to be replaced, the PLC controller 40 controls the cylinder 6 to act, drives the filter screen support plate 5 to move outward, and until the filter screen 53 is completely separated from the upper connecting seat 3 and the lower connecting seat 4, so that the filter screen 53 can be conveniently replaced. After replacement, the PLC controller 40 controls the cylinder 6 to act reversely to drive the filter screen support plate 5 to move, so that it enters the upper connecting seat 3 and the lower connecting seat 4 and is blocked by the positioning baffle 33. At this time, the filter screen support plate 5 returns to the initial state, that is, the circular groove 51 on the filter screen support plate 5 is coaxial with the upper cylinder 11, the lower cylinder 12, the upper connecting cylinder 31 and the lower connecting through hole 41, and the filter screen support plate 5 is in a sealed state with the upper connecting seat 3 and the lower connecting seat 4.
[0034] As can be seen from the above, the utility model provides a kind of filtering and discharging device for ammonium chloride salt, its structure is simple, and manufacturing cost is low, it can effectively avoid ammonia gas scattering, the whole filtering process can be realized automation, manual operation is greatly reduced, and the replacement of filter screen also greatly reduces the labor demand, which not only greatly improves the filtering efficiency and effectively reduces environmental pollution, but also effectively avoids the health of workers from being damaged.
Claims
1. A filter discharge apparatus for ammonium chloride salt comprising: The filter cylinder is characterized in that the filter cylinder comprises an upper cylinder and a lower cylinder arranged in sequence, the top of the upper cylinder is provided with a feeding pipe with a feeding control valve and an upper cylinder exhaust pipe with an upper cylinder exhaust valve, the bottom of the lower cylinder is provided with a liquid discharge pipe with a liquid discharge control valve, a filter salt discharging mechanism is arranged between the upper cylinder and the lower cylinder, the filter salt discharging mechanism comprises an upper connecting seat and a lower connecting seat, the upper connecting seat is provided with an upper connecting cylinder, the upper end of the upper connecting cylinder is fixedly and sealingly connected with the lower end of the upper cylinder, the lower connecting seat is provided with a lower connecting through hole, and the lower connecting seat is fixedly and sealingly connected with the upper end of the lower cylinder; a filter screen assembly is arranged between the upper connecting seat and the lower connecting seat, the filter screen assembly comprises a filter screen support plate, the top of the filter screen support plate is provided with a circular recess which is concave downward, the bottom of the circular recess is a filter screen hole plate, and a filter screen is arranged on the filter screen hole plate in the circular recess; the upper cylinder, the lower cylinder, the upper connecting cylinder, the lower connecting through hole and the circular recess are coaxial, and the upper cylinder, the upper connecting cylinder, the filter screen, the filter screen hole plate, the lower connecting through hole and the lower cylinder are sequentially communicated, and the top and the bottom of the filter screen support plate outside the circular recess are sealingly connected with the bottom of the upper connecting seat and the top of the lower connecting seat respectively. Three of the four side edges of the upper connecting seat and the lower connecting seat are fixedly connected with each other, and the other side edge forms a pull-out opening side; the filter screen support plate of the pull-out opening side is connected with a pull-out driving mechanism, the pull-out driving mechanism can drive the filter screen support plate to move outward until the filter screen is completely pulled out from between the upper connecting seat and the lower connecting seat, or can drive the filter screen support plate to move inward until the circular recess returns to a position coaxial with the upper cylinder, the lower cylinder, the upper connecting cylinder and the lower connecting through hole, and the top and the bottom of the filter screen support plate are sealingly connected with the upper connecting seat and the lower connecting seat again. An upper connecting cylinder above the filter screen support plate is provided with a salt outlet, and the salt outlet is connected with a salt discharging assembly; a stirring paddle for conveying the residual ammonium chloride salt to the salt outlet is arranged in the upper cylinder.
2. A device for filtering out a chloroammonium salt according to claim 1, characterized in that: The salt discharging assembly comprises a salt discharging pipe, a discharging screw is arranged in the salt discharging pipe, a discharging motor for driving the discharging screw to rotate is arranged at the outer end of the salt discharging pipe, a discharging port is arranged at the bottom of the outer end of the salt discharging pipe, and a salt discharging control valve is arranged between the inner end of the salt discharging pipe and the salt outlet; the discharging port is connected with a salt storage tank, an electronic scale is arranged at the bottom of the salt storage tank, and a salt storage tank emptying pipe with a salt storage tank emptying control valve is arranged at the upper end of the salt storage tank.
3. A device for filtering out a chlorinated ammonium salt according to claim 1 or 2, characterized in that: The liquid discharge pipe is connected to a filtrate receiving tank, a flow meter is further arranged on the liquid discharge pipe, a vacuum pipe with a negative pressure pipe control valve is arranged on the filtrate receiving tank, and the vacuum pipe is connected with a negative pressure generating device.
4. A device for filtering out a chloroammonium salt according to claim 1, characterized in that: The upper end of the upper connecting cylinder is fixedly and sealingly welded with the upper cylinder and the lower end, and the bottom of the lower connecting seat is fixedly and sealingly welded with the upper end of the lower cylinder.
5. A device for filtering out a chloroammonium salt according to claim 3, characterized in that: The inner wall of the upper connecting cylinder is provided with a tapered inner wall for downwardly guiding materials.
6. A device for filtering out a chloroammonium salt according to claim 1 or 2, characterized in that: The sealing connection structure between the filter screen support plate and the upper and lower connecting seats comprises: a circular sealing groove is arranged on the top and bottom of the filter screen support plate outside the circular groove, a sealing ring is arranged in the sealing groove, and the top and bottom of the filter screen support plate are respectively sealed with the bottom of the upper connecting seat and the top of the lower connecting seat through the sealing rings.
7. A device for filtering out a chloroammonium salt according to claim 1 or 2, characterized in that: The pulling driving mechanism is a cylinder, a piston rod of the cylinder is connected with one end of the filter screen support plate, and a cylinder body of the cylinder is installed on a support outside the filter cylinder body.
8. A device for filtering out a chloroammonium salt according to claim 7, characterized in that: The support is fixedly connected with one end of a pair of parallel support rods, the support rods are respectively located on both sides of the piston rod of the cylinder, the other end of the support rods is fixedly connected on the lower connecting seat, a blocking rod is arranged above each support rod, both ends of each blocking rod are fixedly connected with the support and the upper connecting seat, when the filter screen support plate moves outward, both ends of the filter screen support plate are located in the gap between the support rods and the blocking rods, and the filter screen support plate is supported on the two support rods.
9. A device for filtering a chlor- ammonium salt according to claim 8, characterized in that: The bottom of the upper connecting seat is provided with a positioning blocking plate, when the filter screen support plate is driven by the cylinder to move inward to be blocked by the positioning blocking plate, the filter screen support plate returns to a state that the upper circular groove is coaxial with the upper cylinder body, the lower cylinder body, the upper connecting cylinder body and the lower connecting through hole, and the filter screen support plate is sealed with the upper and lower connecting seats.
10. A device for filtering a chlor- ammonium salt according to claim 1 or 2, characterized in that: The three side edges of the upper and lower connecting seats are fixed by bolts.