Raw material adding device and method in preparation process of polyaluminum chloride

Abstract

The invention discloses a raw material adding device and method in the preparation process of polyaluminum chloride, and relates to conveying and adding of raw materials, the raw material adding device comprises a screw shaft, one end, close to a feeding pipe, of the screw shaft is connected with a screw rod, the screw rod is sleeved with a transmission mechanism, and the transmission mechanism comprises a shaft sleeve; the two ends of the shaft sleeve are rotationally connected with a nut and a connecting block respectively, the nut is connected with the connecting block through a torsion spring, and the nut is in threaded connection with the screw rod; a rebound device is installed at the position, corresponding to the shell, of the feeding pipe, one end of the rebound device penetrates through the feeding pipe and is connected with a piston, the rebound device is rotationally connected with the piston, and the piston is connected with the connecting block. The raw material conveying device has the beneficial effects that after raw materials are conveyed, the raw materials are prevented from being clamped in the shell, and the piston and the shell can be sealed.

Description

Technical Field

[0001] The present invention relates to the technical field of the transportation and addition of raw materials, and particularly to a device and method for adding raw materials in the preparation process of polyaluminum chloride. Background Technique

[0002] In the preparation process of polyaluminum chloride, the raw material addition link is crucial. At present, in the industrial production of polyaluminum chloride, a screw feeder is generally used to transport and add raw materials such as aluminum and hydrochloric acid. The working principle of this screw feeder is to utilize the gravity of the raw materials themselves and the pushing action of the screw blades to extrude the piston, so as to open the piston closed at the pipe orifice, and then realize the feeding operation.

[0003] However, the existing raw material addition method has obvious defects. When the raw material transportation is about to end, there is less raw material inside the screw feeder and there is no subsequent replenishment of raw materials. At this time, the raw materials cannot form an effective thrust on the piston, so the piston will close, resulting in some residual raw materials being stuck between the transportation ports under the resistance of the screw feeder and the piston.

[0004] After the screw feeder completely stops, the raw materials lose the thrust of the screw feeder and move towards the pipe orifice under the extrusion of the piston. Due to the irregularity of the aluminum blocks, the aluminum blocks will get stuck with each other. When the piston tries to close the pipe orifice, these residual aluminum blocks are very likely to be stuck between the piston and the pipe orifice. This not only fails to effectively seal the transportation pipeline, but also once the pipeline is not sealed tightly, the waste gas generated during the reaction of aluminum and hydrochloric acid will leak. The leakage of waste gas will not only pollute the production environment, endanger the health of operators, but also may cause potential safety hazards. At the same time, the raw material residue and jamming between the piston and the pipe orifice will affect the normal service life of the piston, increase the maintenance cost and repair frequency of the equipment, and reduce the production efficiency. Summary of the Invention

[0005] The purpose of the present invention is to provide a device and method for adding raw materials in the preparation process of polyaluminum chloride to solve the problems put forward in the above background technique.

[0006] In the first aspect, to achieve the above object, the present invention provides the following technical solution:

[0007] A device for adding raw materials in the preparation process of polyaluminum chloride includes a screw feeder. The screw feeder includes a feed pipe. The screw feeder further includes a housing. One end of the housing is communicated with the feed pipe. A driving device is installed at the other end of the housing. The driving end of the driving device is connected with a screw shaft. The screw shaft penetrates the housing, and screw blades are arranged on the screw shaft;

[0008] One end of the spiral shaft close to the feed pipe is connected with a screw rod, a transmission mechanism is sleeved on the screw rod, the transmission mechanism includes a shaft sleeve, two ends of the shaft sleeve are respectively rotatably connected with a nut and a connecting block, the nut and the connecting block are connected by a torsion spring, and the nut is in threaded connection with the screw rod;

[0009] A rebounder is installed on the feed pipe corresponding to the position of the housing, one end of the rebounder penetrates through the feed pipe and is connected with a piston, the rebounder is rotatably connected with the piston, and the piston is connected with the connecting block.

[0010] Preferably, the spring constant and the maximum deformation distance of the rebounder are both smaller than those of the torsion spring, and the elastic force that the rebounder can withstand is smaller than the elastic force that the torsion spring can withstand. That is, when the same external force is applied to the rebounder and the torsion spring for compression, the compression amount of the rebounder is larger than that of the torsion spring, indicating that the rebounder has a weaker ability to resist external force compression, that is, the overall compression elastic force of the rebounder is smaller than that of the torsion spring.

[0011] Preferably, a connecting groove is formed in the piston corresponding to the position of the connecting block, the connecting groove is nested with the connecting block, and the connecting block is slidably arranged in the connecting groove, which is convenient for the separation between the connecting block and the piston and convenient for later maintenance and repair.

[0012] Preferably, an outward expansion port is arranged at one end of the housing close to the feed pipe, which can facilitate the falling of the raw materials remaining on the feed pipe.

[0013] Preferably, the piston is nested with the outward expansion port so that the piston can be closely attached to the outward expansion port.

[0014] Preferably, a plurality of brushes are arranged on the piston, which can clean the outward expansion port to avoid the residue of raw materials.

[0015] Preferably, a sealing gasket is arranged on the piston, which improves the sealing performance after the piston is sealed.

[0016] In a second aspect, to achieve the above object, the present invention provides the following technical solution:

[0017] A method for adding raw materials in the preparation process of polyaluminum chloride, the raw materials are transported into the housing through the feeding port, the driving device drives the spiral shaft and the spiral blades to rotate, and the raw materials are transported towards the feed pipe;

[0018] At the same time, the screw rod rotates along with the spiral shaft, the nut squeezes the torsion spring under the rotation of the screw rod, and the connecting block and the piston are pushed through the torsion spring, so that the piston compresses the rebounder and moves away from the housing;

[0019] After the driving device stops rotating, the nut moves away from the piston on the screw rod under the drive of the torsion spring, and at the same time, the piston moves towards the housing under the elastic force of the rebounder.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: By providing a screw rod on the spiral shaft, while the spiral shaft drives the screw rod to rotate, the nut squeezes the torsion spring under the rotation of the screw rod, and the torsion spring pushes the connecting block and the piston, so that the piston compresses the rebounder and moves away from the housing, opening the piston, enabling raw material addition. And even if there is no raw material in the housing, as long as the driving device is operating, the nut will always push the piston and will not cause the piston to close.

[0021] After the driving device stops, the nut moves away from the piston on the screw rod under the drive of the torsion spring, and at the same time, the piston slowly moves towards the housing under the elastic force of the rebounder. At this time, the raw material remaining in the outer flared opening will naturally fall into the reaction kettle, avoiding the problem that the raw material squeezes the piston, and after the conveying stops, the remaining raw material will get stuck between the piston and the housing, causing the piston to not close tightly. Thus, it solves the problem of the piston being unable to be avoided in the prior art, resulting in waste gas leakage during the reaction process. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the connection structure between the housing of the present invention and the reaction kettle;

[0023] Figure 2 It is a schematic diagram of the transmission mechanism structure of the present invention;

[0024] Figure 3 It is a schematic diagram of the connection groove structure of the present invention;

[0025] Figure 4 It is a schematic diagram of the torsion spring structure of the present invention;

[0026] Figure 5 It is a schematic diagram of the bushing structure of the present invention;

[0027] Figure 6 It is a schematic diagram of the piston structure of the present invention;

[0028] Figure 7 For the present invention Figure 6 The enlarged structure schematic diagram at position A.

[0029] In the figure: 1, reaction kettle; 2, feed pipe; 3, housing; 4, outward expansion port; 5, feeding port; 6, driving device; 7, spiral shaft; 8, spiral blade; 9, piston; 10, rebounder; 11, screw; 12, bushing; 13, nut; 14, connecting block; 15, torsion spring; 16, connecting groove; 17, gasket; 18, brush; 19, groove; 20, screw feeder; 21, transmission mechanism. Detailed implementation manners

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] Please refer to Figures 1 to 7 , the present invention provides a raw material adding device for the preparation process of polyaluminum chloride, including a screw feeder 20. The screw feeder 20 includes a feed pipe 2 and a housing 3. One end of the housing 3 is hermetically connected to the feed pipe 2, and a driving device 6 is installed at the other end of the housing 3. The driving end of the driving device 6 is connected to a spiral shaft 7. The spiral shaft 7 penetrates through the housing 3, and spiral blades 8 are arranged on the spiral shaft 7.

[0032] During the preparation process of polyaluminum chloride, the raw materials need to be added into the reaction kettle 1. Therefore, usually the feed pipe 2 is connected to the feed inlet of the reaction kettle 1, and in order to avoid the risk of leakage, the feed pipe 2 and the reaction kettle 1 are usually hermetically connected.

[0033] The screw feeder 20 belongs to the prior art, and its specific structure and working principle can refer to relevant literature, which will not be elaborated here.

[0034] The driving device 6 is used to drive the spiral shaft 7 to rotate. The driving device 6 can be a motor or other driving sources, which have mature applications in the art and will not be elaborated here.

[0035] A feeding port 5 communicating with the inside of the housing 3 is also opened on the housing 3. The prepared raw materials are transported into the housing 3 through the feeding port 5. The driving device 6 drives the spiral blades 8 to rotate through the spiral shaft 7, so as to transport the raw materials towards the feed pipe 2 and fall into the reaction kettle 1 under the action of gravity, completing the transportation of the raw materials.

[0036] During the production and preparation process of polyaluminum chloride, aluminum and hydrochloric acid react to generate waste gases, such as hydrogen chloride gas, etc. In order to prevent these waste gases from polluting the environment, it is necessary to seal the reaction kettle 1 and uniformly treat these waste gases.

[0037] Since the screw feeder 20 needs to convey raw materials, such as aluminum blocks, into the reaction kettle 1, in order to prevent the exhaust gas generated during the reaction from flowing out to the outside along the screw feeder 20, after the raw material conveying is completed, it is necessary to seal the connection part between the screw feeder 20 and the reaction kettle 1.

[0038] Currently, the sealing between the housing 3 and the material pipe 2 is mainly achieved through the piston 9. A rebounder 10 is installed at the position of the material pipe 2 corresponding to the housing 3. One end of the rebounder 10 penetrates through the feed pipe 2 and is connected with the piston 9, and the rebounder 10 is rotatably connected with the piston 9, which can be realized by setting a bearing between the piston 9 and the rebounder 10, and will not be elaborated here. The piston 9 can block one end of the housing 3.

[0039] In order to facilitate the pouring of raw materials, an outward expansion port 4 is provided at one end of the housing 3 close to the feed pipe 2. At the same time, the shape of the piston 9 corresponds to that of the outward expansion port 4, and the piston 9 is nested in the outward expansion port 4.

[0040] The piston 9 abuts against one end of the housing 3 under the elastic force of the rebounder 10, so that the connection between the connecting pipe 2 and the housing 3 is no longer communicated, forming a gap. Therefore, a gap is formed between the housing 3 and the reaction kettle. When the driving mechanism drives the raw materials to be conveyed through the screw shaft 7 and the screw blade 8, the raw materials move towards the feed pipe 2 under the drive of the screw blade 8 until the raw materials abut against the surface of the piston 9. The raw materials will push the piston 9 under the thrust of the screw blade 8, causing the piston 9 to leave one end of the housing 3 and compress the rebounder 10. At this time, the raw materials fall into the reaction kettle 1 through the gap between the piston 9 and the housing 3.

[0041] After the raw material conveying is completed, the piston 9 loses the thrust of the raw materials and will re-approach one end of the housing 3 under the elastic force of the rebounder 10, thus blocking the housing 3. A barrier is formed between the housing 3 and the connecting pipe 2, and at the same time, a barrier is formed between the housing 3 and the reaction kettle 1, so as to prevent the exhaust gas generated during the reaction from flowing out.

[0042] However, in the above sealing method, the piston 9 may be stuck during the reset process. Since the aluminum raw material during the reaction is an aluminum block, when the driving mechanism stops rotating, at this time, the raw materials in the housing 3 lose the thrust and will remain in the housing 3. Similarly, there may also be aluminum blocks at the contact part between the housing 3 and the piston 9. In this way, during the reset process of the piston 9, it may be stuck by the aluminum blocks, resulting in the piston 9 being unable to fit the housing 3, thus causing the exhaust gas to flow into the outside along the inside of the housing 3.

[0043] Moreover, by the method of pushing the piston 9 with raw materials, continuous thrust of the raw materials is required. If there is less raw material remaining in the housing 3 when the raw material conveying is about to end, at this time, the raw materials cannot push the piston 9 to move, that is, there will be some raw material residues in the housing 3 every time the raw materials are conveyed.

[0044] Therefore, the present application provides the following solutions:

[0045] A screw rod 11 is connected to one end of the spiral shaft 7 away from the motor. A transmission mechanism 21 is arranged on the screw rod 11, and the screw rod 11 penetrates through the transmission mechanism 21. The transmission mechanism 21 includes a shaft sleeve 12. Nuts 13 and connecting blocks 14 are respectively rotatably connected to both ends of the shaft sleeve 12, and the nuts 13 and the connecting blocks 14 can also slide between the shaft sleeve 12. The nuts 13 and the connecting blocks 14 are connected by a torsion spring 15.

[0046] The connection mode between the spiral shaft 7 and the screw rod 11 can be bolt connection or snap connection.

[0047] The nut 13 is threadedly connected to the screw rod 11, and the connecting block 14 is connected to the piston 9.

[0048] In the initial state, the rebounder 10 moves to the maximum stroke, the piston 9 cooperates with the outward expansion port 4 for sealing, realizing airtight material sealing, and the torsion spring is in a relaxed state.

[0049] When the driving device 6 conveys the raw materials through the spiral shaft 7 and the spiral blade 8, the screw rod 11 will rotate driven by the spiral shaft 7. The nut 13 threadedly connected to the screw rod 11 will drive the connecting block 14 and the piston 9 to rotate through the torsion spring 15. However, due to the self-weight of the piston 9, the rotational force given to the piston 9 by the torsion spring 15 is not sufficient to drive the piston 9 to rotate. Therefore, the piston 9 gives a reaction force to the nut 13 through the torsion spring 15, making the nut 13 unable to rotate with the screw rod 11. At this time, the nut 13 is driven by the screw rod 11 and moves towards the end close to the piston 9 on the screw rod 11.

[0050] At this time, the axial pressure between the screw rod 11 and the nut 13 is small. When the screw rod 11 rotates, the frictional torque of the nut 13 by the screw rod 11 is small, less than the starting torque required to rotate the piston 9 (the resistance torque, and the specific value can be set through a resistor), and thus it cannot drive the nut 13 and the piston 9 to rotate together. The nut 13 can only move axially and press the piston 9 away from the discharge port.

[0051] Perform a force analysis on the nut 13. When the screw rod 11 rotates, if there is no influence of other forces on the nut 13 at this time, the nut 13 will rotate following the screw rod 11 under the action of friction. However, in actual situations, the nut 13 is connected to the torsion spring 15. When the nut 13 rotates, it will receive a reaction force from the torsion spring 15. At this time, the nut 13 cannot rotate but will axially move on the screw rod 11. It can be understood as two hands, respectively grasping a nut 13 and a screw rod 11. The nut 13 is threadedly connected to the screw rod 11. At this time, when the screw rod 11 rotates, the nut 13 will rotate following the screw rod 11 due to the action of friction. But if a torsion spring 15 is connected to the nut 13, assuming that one end of the torsion spring 15 is fixed on a plane at this time, the torsion spring 15 will give the nut 13 a reaction force, making the nut 13 unable to rotate but axially move on the screw rod 11.

[0052] Since the nut 13 moves towards the end close to the piston 9, the nut 13 will squeeze the torsion spring 15 closer to the connecting block 14. The torsion spring 15 receives the pressure from the nut 13 and simultaneously transmits the reaction force of the pressure received at this time to the connecting block 14 and the piston 9. The piston 9 will then squeeze the rebounder 10. When the reaction force of the piston 9 from the torsion spring 15 is greater than the elastic force given by the rebounder 10 to the piston 9, as the nut 13 continues to move, the piston 9 will compress the rebounder 10 and move away from the conveying pipeline. At this time, the housing 3 is connected to the connecting pipe 2 and the reaction kettle 1, and raw material transportation can be carried out.

[0053] During the process of the nut 13 driving the piston 9 to move, the rebound force exerted by the rebounder 10 gradually increases, resulting in an increase in the frictional torque of the nut 13 on the screw rod 11. Set the resistance torque of the piston 9 to be approximately equal to the maximum torque of the torsion spring 15 until the nut 13 and the screw rod 11 rotate together. At this time, the torsion spring 15 starts to store energy.

[0054] When the torsion of the torsion spring 15 reaches the maximum, it reaches the resistance torque of the piston 9. At this time, the piston 9 will start to rotate, and this state will be maintained throughout the feeding process.

[0055] When the reaction force of the piston 9 from the torsion spring 15 and the force given by the rebounder 10 to the piston 9 reach equilibrium, generally at this time, the torsion spring 15 reaches the maximum elastic force it has stored. At this time, the nut 13 cannot push the piston 9 to compress the rebounder 10 through the torsion spring 15 and the connecting block 14. Therefore, the nut 13 cannot continue to move on the screw rod 11, which means that the nut 13 has moved to the maximum stroke on the screw rod 11 at this time, and the piston 9 is also in a fully open state. At this time, since the nut 13 cannot continue to rotate on the screw rod 11, the nut 13, the torsion spring 15, the connecting block 14, and the piston 9 are all driven by the screw rod 11 to rotate.

[0056] When the frictional force on the nut 13 from the screw 11 is greater than the reaction force given by the torsion spring 15, the nut 13 can rotate on the screw 11. At this time, the nut 13 will not move axially on the screw 11. If the piston 9 does not rotate, the frictional force on the nut 13 is always less than the reaction force given by the torsion spring 15, and the nut 13 will move axially on the screw 11.

[0057] When the torsion spring 15 is compressed to the limit, the torsion spring 15 can be regarded as an inextensible connecting piece at this time because the torsion spring 15 cannot be further compressed. And the connection between the connecting block 14 and the nut 13 through the torsion spring 15 can be understood as direct drive at this time, and it can be understood that the screw 11 directly drives the piston 9 to rotate. At this time, the nut 13, the torsion spring 15, the connecting block 14 and the piston 9 can be regarded as a whole, and the nut 13, the torsion spring 15, the connecting block 14 and the piston 9 rotate under the drive of the screw 11.

[0058] The rebounder 10 has a mature application in the prior art. It is mainly composed of a spring, an iron hook, a magnetic head, a rubber head and a plastic sleeve, etc., and provides elastic force through the internal spring.

[0059] The spring constant and the maximum deformation distance of the rebounder 10 are both smaller than those of the torsion spring 15. The spring constant and the maximum deformation distance of the rebounder 10 can be regarded as those of the internal spring of the rebounder 10.

[0060] According to Hooke's law, the elastic force is the product of the spring constant and the deformation of the spring. It can be known that the elastic force that the rebounder 10 can withstand is less than that of the torsion spring 15. That is, when the same external force is applied to compress the rebounder 10 and the torsion spring 15, the compression amount of the rebounder 10 is larger than that of the torsion spring 15, indicating that the ability of the rebounder 10 to resist external force compression is weaker. That is, the overall compression elastic force of the rebounder 10 is less than that of the torsion spring 15. Therefore, when the rebounder 10 is compressed to the limit, the torsion spring 15 can still be compressed. Generally speaking, the compression elastic force of the rebounder 10 is two-thirds of the compression elastic force of the torsion spring 15.

[0061] From the above, it can be seen that the torsion spring 15 transmits the thrust to the piston 9 through the connecting block 14 and pushes the piston 9 to compress the rebounder 10. When the torsion spring 15 is not completely compressed to the limit, the piston 9 has already pushed the rebounder 10 to shrink to the maximum extent, which is convenient for the transportation of raw materials.

[0062] When the screw rod 11 starts to drive the piston 9 to rotate, the friction between the piston 9 and the rebounder 10 causes the nut 13 to be unable to drive the connecting block 14 and the piston 9 to rotate through the torsion spring 15. When the nut 13 can drive the connecting block 14 and the piston 9 to rotate through the torsion spring 15, the friction between the piston 9 and the rebounder 10 is less than or equal to the elastic force of the torsion spring 15. Generally, the friction between the piston 9 and the rebounder 10 is set to half of the maximum elastic potential energy of the torsion spring 15, which can be calculated by Coulomb's friction law and Hooke's law, and will not be described in detail here.

[0063] In summary, the screw shaft 7 drives the screw 11 to rotate, thereby driving the nut 13 to make corresponding movements. The influence of the sleeve 12 is ignored here. Under the cooperation of the nut 13, the torsion spring 15 and the connecting block 14, the piston 9 is pushed so that the piston 9 no longer blocks the housing 3, and the housing 3 is connected with the connecting pipe 2 and the reactor 1. Under the continuous driving of the screw feeder 20, the raw materials are transported from the housing 3 to the reactor 1, completing the transportation of the raw materials.

[0064] When the raw material is transported, the driving device 6 stops rotating, the spiral shaft 7 and the spiral blade 8 stop rotating, and at the same time, the screw 11 also stops rotating. At this time, the screw 11 no longer directly applies a force to the nut 13, and the piston 9, the connecting block 14 and the nut 13 are simultaneously subjected to the rebound force of the torsion spring 15, driving the piston 9 and the nut 13 to rotate in the opposite direction (opposite to the direction driven by the driving device 6). At this time, the reaction force of the torsion spring 15 on the nut 13 is greater than the friction force between the nut 13 and the screw 11, so the nut 13 will rotate on the screw 11, and at the same time, the nut 13 will move on the screw 11 in the direction away from the piston 9.

[0065] At the same time, under the action of the nut 13, the torsion spring 15 and the rebound force of the rebounder 10, and the release of the elastic force of the torsion spring 15, the piston 9 will give the piston 9 a force to continue to squeeze the rebounder 10, and the piston 9 will slowly move in the direction close to the housing 3. After the elastic force of the torsion spring 15 is completely released, the rebound force of the rebounder 10 will accelerate the return of the piston 9. Until the piston 9 returns to its original position, the housing 3 is separated from the feed pipe 2 again, and at the same time, it is separated from the reactor 1. Since the raw materials do not directly squeeze the piston 9, after the feeding stops (that is, when the raw materials in the housing 3 are basically transported), when the piston 9 slowly returns, the raw materials in the external expansion 4 will naturally fall into the reactor 1. To prevent the piston 9 from directly contacting the raw materials, after the transportation stops, part of the raw materials form a barrier between the piston 9 and the external expansion 4.

[0066] Avoid loose sealing of the conveying pipeline, which may lead to leakage of waste gas during the production process, causing environmental pollution and harm to the health of operators.

[0067] Meanwhile, driven by the torsion spring 15, the piston 9 will also rotate.

[0068] A plurality of brushes 18 are arranged on the piston 9. When the piston 9 rotates, it will drive the brush to clean the inner wall of the housing 3 or the outer flared opening 4, avoiding the problem that raw materials adhere to the inner wall of the housing 3 or the outer flared opening 4, which affects the subsequent raw material addition, and preventing the situation where the piston 9 cannot be closely attached to the inner wall of the housing 3 or the outer flared opening 4.

[0069] As Figure 6 shown, the piston 9 includes a conical portion and an annular portion. The brush 18 is arranged on the conical portion, and a groove 19 is formed on the conical portion. The brush 18 is arranged in the groove 19, and this groove 19 does not penetrate the entire conical portion. When the piston 9 returns and rotates, it will drive the brush 18 to clean the inner wall of the housing 3 or the outer flared opening 4. When the piston 9 fits on the inner wall of the housing 3 or the outer flared opening 4, under the action of the internal and external extrusion forces, the brush 18 will be squeezed in the groove 19 and will not protrude from the piston 9 to affect the sealing performance. And the groove 19 is not arranged in a penetrating manner. At this time, the two ends of the conical portion are not connected. Therefore, the groove 19 will not connect the two ends of the conical portion. And sealing gaskets 17 are arranged on both the annular portion and the conical portion. The sealing gasket 17 can be squeezed when the piston 9 contacts the inner wall of the housing 3 or the outer flared opening 4, thereby improving the sealing effect.

[0070] It should be noted that other feed channels, pressure relief valves, collection tanks, etc. are also arranged on the reaction kettle 1, which are general knowledge in the field and will not be elaborated here.

[0071] A connection groove 16 is formed at the position of the piston 9 corresponding to the connection block 14. The connection groove 16 is nested with the connection block 14, and the connection block 14 is slidably connected in the connection groove 16. Such a setting can facilitate the separation between the connection block 14 and the piston 9, which is convenient for later maintenance and servicing.

[0072] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A raw material adding device for the preparation process of polyaluminium chloride, characterized in that: The invention comprises a screw feeder (20), wherein the screw feeder (20) comprises a feed pipe (2) and a shell (3), one end of the shell (3) is connected to the feed pipe (2), the other end of the shell (3) is provided with a drive device (6), the drive end of the drive device (6) is connected with a screw shaft (7), the screw shaft (7) passes through the shell (3), and a screw blade (8) is provided on the screw shaft (7); The end of the spiral shaft (7) close to the feed pipe (2) is connected to a screw rod (11), and a transmission mechanism (21) is sleeved on the screw rod (11). The transmission mechanism (21) includes a shaft sleeve (12), and the two ends of the shaft sleeve (12) are rotatably connected to a nut (13) and a connecting block (14), and the nut (13) and the connecting block (14) are connected by a torsion spring (15), and the nut (13) and the screw rod (11) are threadedly connected. A rebounder (10) is installed on the feed pipe (2) at a position corresponding to the shell (3), one end of the rebounder (10) passes through the feed pipe (2) and is connected to the piston (9), the rebounder (10) is rotatably connected to the piston (9), and the piston (9) is connected to the connecting block (14).

2. The raw material adding device for the preparation process of polyaluminium chloride according to claim 1, characterized in that: The stiffness coefficient and the maximum deformation distance of the rebounder (10) are both smaller than the stiffness coefficient and the maximum deformation distance of the torsion spring (15).

3. The raw material adding device for the preparation process of polyaluminium chloride according to claim 2, characterized in that: A connection groove (16) is provided on the piston (9) at a position corresponding to the connection block (14); the connection groove (16) is nested with the connection block (14); and the connection block (14) is slidably disposed in the connection groove (16).

4. The raw material adding device for the preparation process of polyaluminium chloride according to claim 3, characterized in that: An outer expansion opening (4) is provided at one end of the shell (3) close to the feed pipe (2).

5. The raw material adding device for the preparation process of polyaluminium chloride according to claim 4, characterized in that: The piston (9) is nested with the outer expansion opening (4).

6. The raw material adding device for the preparation process of polyaluminium chloride according to any one of claim 5, characterized in that: A plurality of brushes (18) are arranged on the piston (9).

7. The raw material adding device for the preparation process of polyaluminium chloride according to claim 6, characterized in that: A sealing gasket (17) is provided on the piston (9).

8. A method for adding raw materials in the preparation process of polyaluminium chloride using the device described in any one of claims 2 to 7, characterized in that: The raw material is conveyed into the housing (3) through the feeding port (5), and the driving device (6) drives the spiral shaft (7) and the spiral blade (8) to rotate, thereby conveying the raw material toward the feeding pipe (2); The screw rod (11) rotates along with the screw shaft (7), and the nut (13) compresses the torsion spring (15) under the rotation of the screw rod (11), and pushes the connecting block (14) and the piston (9) through the torsion spring (15), so that the piston (9) compresses the rebounder (10) and moves in a direction away from the housing (3); After the driving device (6) stops rotating, the nut (13) is driven by the torsion spring (15) to move on the screw rod (11) in a direction away from the piston (9); The piston (9) moves towards the direction approaching the housing (3) under the elastic force of the rebounder (10).

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