Granulation equipment for diammonium phosphate

Abstract

The invention relates to the field of granulation facilities, in particular to diammonium phosphate granulation equipment which comprises a drum seat and a rotary drum obliquely and rotatably mounted at the upper end of the drum seat, a guide hopper is arranged at a feeding port of the rotary drum, a material control part is arranged at the upper end of the guide hopper, a material spraying pipe is arranged below the guide hopper, and a material outlet is formed in the lower end of the material spraying pipe. A plurality of first extrusion plates and a plurality of second extrusion plates are evenly distributed in the middle of the side face of the guide hopper in a sliding mode, the first extrusion plates and the second extrusion plates are arranged in a staggered mode, a plurality of vertical extrusion pieces vertically extend on the side face of each first extrusion plate in a linear array mode, and a plurality of horizontal extrusion pieces horizontally extend on the side face of each second extrusion plate in a linear array mode. According to the invention, the uniformity of the granulation particle size is improved, large particles in the raw material powder are fully removed by vertical extrusion and horizontal extrusion, and meanwhile, the structure is compact after the particles grow up.

Description

Technical Field

[0001] The present invention relates to the field of granulation facilities, and in particular to a granulation device for diammonium phosphate. Background Art

[0002] Diammonium phosphate is an important high-concentration phosphorus-nitrogen compound fertilizer and is widely used in agricultural production. When producing and granulating diammonium phosphate, a rotary drum granulator is usually used for granulation. During the granulation process, the raw material powder is sprayed with slurry and then rolls inside the rotating drum to wet the fine powder particles by using the water in the slurry, and the particles are agglomerated by collision and rolling to form granules, so as to achieve the purpose of granulation.

[0003] However, during the granulation process of the rotary drum granulator, since large particles of raw materials are mixed in the powder during the processing of the raw material powder, and the large particles of raw materials will form larger particles when sprayed with slurry and rolled for agglomeration, the existence of this part of the particles will affect the uniformity of the particle size after granulation. Summary of the Invention

[0004] The purpose of the present invention is to solve the disadvantages existing in the background art, and to propose a granulation device for diammonium phosphate.

[0005] To achieve the above object, the technical solution adopted by the present invention is: a granulation device for diammonium phosphate, including a drum base and a rotary drum that is obliquely and rotatably installed at the upper end of the drum base. A guiding hopper is provided at the feed inlet of the rotary drum. A material control member is provided at the upper end of the guiding hopper. A spray pipe is provided below the guiding hopper. A plurality of first extrusion plates and a plurality of second extrusion plates are evenly distributed and slidably arranged in the middle of the side surface of the guiding hopper. The first extrusion plates and the second extrusion plates are arranged in a staggered manner. A plurality of vertical extrusion sheets extend vertically in a linear array on the side surface of the first extrusion plate. A plurality of horizontal extrusion sheets extend horizontally in a linear array on the side surface of the second extrusion plate. The vertical extrusion sheets and the horizontal extrusion sheets all slide through the side surface of the guiding hopper and into the interior of the guiding hopper. A column frame is fixedly installed on the side surface of a plurality of the first extrusion plates. A bridge frame is fixedly installed on the side surface of a plurality of the second extrusion plates. Exchange tooth plates are fixedly installed on the opposite surfaces of the bridge frame and the column frame. The exchange tooth plate on the column frame is above the exchange tooth plate on the bridge frame. An exchange gear is meshed between the two exchange tooth plates. The exchange gear is connected to the guiding hopper. A pushing sheet member is connected to the middle of the column frame.

[0006] Preferably, a bearing frame is fixedly installed at the lower edge of the side surface of the guiding hopper. The exchange gear is rotatably installed at the end of the bearing frame.

[0007] Preferably, one end of each of the two first extrusion plates located at the upper and lower edges extends with a first plate ear, a first guide post is slidably installed through the end of the first plate ear, the end of the first guide post is fixed to the guiding hopper, one end of each of the two second extrusion plates located at the upper and lower edges extends with a second plate ear, a second guide post is slidably installed through the end of the second plate ear, and the end of the second guide post is fixed to the guiding hopper.

[0008] Preferably, two columns are symmetrically and fixedly installed at the end of the drum base, a concave frame is inlaid on the outer surface of the two columns, the end of the concave frame is fixed to the guiding hopper, and the spraying pipe is fixed to the lower end of the concave frame.

[0009] Preferably, the pushing piece includes a tapered frame extending in the middle of the column frame, a reciprocating frame is rotatably installed at the end of the tapered frame, a Y-shaped frame extends from the side of the concave frame, two crankshafts are rotatably installed through both ends of the Y-shaped frame, a pin shaft is inlaid through between the ends of the two crankshafts, and the end of the reciprocating frame is rotatably connected to the pin shaft.

[0010] Preferably, a machine base is fixedly installed on the side of the concave frame near the Y-shaped frame, a motor is fixedly installed on the upper end of the machine base, and the output end of the motor is fixed to one of the crankshafts.

[0011] Preferably, the material control piece includes a sliding hopper obliquely and fixedly installed at the upper end of the guiding hopper, the upper end of the column is fixed to the sliding hopper, a connecting shaft is rotatably installed through the outlet of the sliding hopper, a discharging plate extends on the outer surface of the connecting shaft, two dialing plate frames are fixedly installed at both ends of the connecting shaft, the dialing plate frames are elastically connected to the sliding hopper, two sealing material frames symmetrically extend from the upper end of the column frame, and the end of the sealing material frame abuts against one side of the dialing plate frame.

[0012] Preferably, two hopper connecting seats symmetrically extend from the lower end of the sliding hopper, a limiting post is rotatably installed at the end of the hopper connecting seat, a limiting sleeve is slidably installed on the outer surface of the limiting post, a frame connecting seat is rotatably installed at the end of the limiting sleeve, the end of the frame connecting seat is fixed to the other side of the dialing plate frame, and a pushing plate spring is arranged between the limiting sleeve and the outer side of the limiting post.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. When the raw material powder falls in the form of a material curtain in the guiding hopper, the moving column frame will drive the first extrusion plate to move left and right continuously. At the same time, the column frame will also drive the second extrusion plate on the bridge frame to move left and right continuously along a movement trajectory opposite to that of the first extrusion plate under the action of the exchange gears and the exchange tooth plates. That is, when the multiple vertical extrusion sheets arranged vertically on the first extrusion plate push the raw material curtain and then retract, the multiple horizontal extrusion sheets arranged horizontally on the second extrusion plate will extend to push the raw material curtain again. This cycle is carried out to refine and remove the large-particle raw materials mixed in the raw material powder under multiple squeezes in different directions, so as to avoid the formation of larger particles by the large-particle raw materials during granulation, thereby affecting the uniformity of the granulation particle size, and thus improving the uniformity of the granulation particle size.

[0014] 2. When the column frame drives the vertical extrusion sheets to retract, the sealing material frame on the column frame will push the dialing plate frame, causing the connecting shaft to rotate, and then driving the feeding plate to turn over, so as to close the discharge port of the sliding hopper. At the same time, it restricts the sliding of the column in the limiting sleeve and the shrinkage and deformation of the push plate spring. When the column frame drives the vertical extrusion sheets to extend, the dialing plate frame will be pushed by the push plate spring that has recovered its deformation due to the loss of the push of the sealing material frame, causing the feeding plate to flip, so as to open the discharge port of the sliding hopper to discharge a small amount of raw material powder. This cycle is carried out to control the thickness of the raw material curtain, making the thickness of the curtain in a relatively thin range. On the one hand, this facilitates the vertical extrusion sheets and the horizontal extrusion sheets to push the large particles in the raw material to ensure that the vertical extrusion sheets and the horizontal extrusion sheets fully remove the large particles in the raw material powder. On the other hand, a relatively thin material curtain can ensure that the slurry sprayed by the spraying pipe acts evenly on the raw material, forming a thin and uniform bonding layer on the surface of the raw material, thus ensuring that the structure is dense after the particles grow. Description of the Drawings

[0015] Figure 1 It is a schematic structural diagram of a granulation device for diammonium phosphate according to the present invention; Figure 2 It is a schematic diagram of the sliding hopper of a granulation device for diammonium phosphate according to the present invention; Figure 3 It is a schematic diagram of the concave frame of a granulation device for diammonium phosphate according to the present invention; Figure 4 It is an internal view of the guiding hopper of a granulation device for diammonium phosphate according to the present invention; Figure 5 It is a granulation device for diammonium phosphate according to the present invention Figure 4 The enlarged view of A in; Figure 6 It is a schematic diagram of the motor of a granulation device for diammonium phosphate according to the present invention; Figure 7 It is a schematic diagram of the sealing material frame of a granulation device for diammonium phosphate according to the present invention; Figure 8Schematic diagram of the push plate spring of a granulation device for diammonium phosphate according to the present invention.

[0016] In the figure: 1, drum base; 2, rotary drum; 3, material sliding hopper; 4, guiding hopper; 5, first extrusion plate; 6, first guide post; 7, first plate ear; 8, second guide post; 9, second plate ear; 10, second extrusion plate; 11, bridge frame; 12, sealing material frame; 13, column frame; 14, motor; 15, concave frame; 16, column; 17, spraying pipe; 18, discharging plate; 19, connecting shaft; 20, dial plate frame; 21, push plate spring; 22, conical frame; 23, reciprocating frame; 24, pin shaft; 25, crankshaft; 26, Y-shaped frame; 27, machine base; 28, exchange gear; 29, exchange tooth plate; 30, bearing frame; 31, vertical extrusion sheet; 32, horizontal extrusion sheet; 33, limiting sleeve; 34, limiting column; 35, hopper connection seat; 36, frame connection seat. Detailed implementation manners

[0017] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments in the following description are only examples, and those skilled in the art can think of other obvious variations.

[0018] Such as Figures 1-8A granulation device for diammonium phosphate shown in the figure includes a drum base 1 and a rotating drum 2 that is tiltedly and rotatably installed at the upper end of the drum base 1. Since driving the rotating drum 2 to rotate for granulation is a prior art and has been widely used, it will not be elaborated in detail here. A guiding hopper 4 is provided at the feeding port of the rotating drum 2. A material control member is provided at the upper end of the guiding hopper 4. A spraying pipe 17 is provided below the guiding hopper 4. The spraying pipe 17 is connected to an external spraying device to spray the slurry onto the raw materials. Since this kind of operation is a prior art and has been widely used, it will not be elaborated in detail here. A plurality of first extrusion plates 5 and a plurality of second extrusion plates 10 are evenly distributed and slidably arranged in the middle of the side surface of the guiding hopper 4. The first extrusion plates 5 and the second extrusion plates 10 are arranged in a staggered manner, and can push the large particles in the raw material powder vertically and horizontally in an alternating manner by using the vertical extrusion sheets 31 and the horizontal extrusion sheets 32, so as to improve the removal effect of the large particles in the raw material powder. A plurality of vertical extrusion sheets 31 extend vertically in a linear array on the side surface of the first extrusion plate 5. A plurality of horizontal extrusion sheets 32 extend horizontally in a linear array on the side surface of the second extrusion plate 10. The vertical extrusion sheets 31 and the horizontal extrusion sheets 32 all slide through the side surface of the guiding hopper 4 and penetrate into the interior of the guiding hopper 4. When the vertical extrusion sheets 31 and the horizontal extrusion sheets 32 retract, the guiding hopper 4 will push out the raw materials between the plurality of vertical extrusion sheets 31 and between the plurality of horizontal extrusion sheets 32 to avoid retention. A column frame 13 is fixedly installed on the side surface of the plurality of first extrusion plates 5. The column frame 13 serves to carry the plurality of first extrusion plates 5. A bridge frame 11 is fixedly installed on the side surface of the plurality of second extrusion plates 10. The bridge frame 11 serves to carry the plurality of second extrusion plates 10. Exchange tooth plates 29 are fixedly installed on the opposite surfaces of the bridge frame 11 and the column frame 13. The exchange tooth plate 29 on the column frame 13 is located above the exchange tooth plate 29 on the bridge frame 11. An exchange gear 28 is meshed between the two exchange tooth plates 29. The cooperation between the exchange tooth plate 29 and the exchange gear 28 can make the plurality of horizontal extrusion sheets 32 arranged horizontally on the second extrusion plate 10 extend to push the raw material curtain again when the plurality of vertical extrusion sheets 31 arranged vertically on the first extrusion plate 5 retract after pushing the raw material curtain. This cycle is carried out to increase the pushing frequency, thereby further improving the removal effect of the large particles in the raw material powder. The exchange gear 28 is connected to the guiding hopper 4, and a pushing piece is connected to the middle of the column frame 13.

[0019] A bearing frame 30 is fixedly installed at the lower edge of the side surface of the guiding hopper 4. The exchange gear 28 is rotatably installed at the end of the bearing frame 30. The bearing frame 30 serves to carry the exchange gear 28.

[0020] At the ends of the two first extrusion plates 5 located at the upper and lower edges, there are first plate ears 7 extending. The ends of the first plate ears 7 are slidably installed through with first guide posts 6. The ends of the first guide posts 6 are fixed to the guiding hopper 4. The cooperation between the first plate ears 7 and the first guide posts 6 plays a role in guiding the first extrusion plates 5. At the ends of the two second extrusion plates 10 located at the upper and lower edges, there are second plate ears 9 extending. The ends of the second plate ears 9 are slidably installed through with second guide posts 8. The ends of the second guide posts 8 are fixed to the guiding hopper 4. The cooperation between the second plate ears 9 and the second guide posts 8 plays a role in guiding the second extrusion plates 10.

[0021] At the end of the drum base 1, two columns 16 are symmetrically and fixedly installed. Concave frames 15 are inlaid on the outer surfaces of the two columns 16. The ends of the concave frames 15 are fixed to the guiding hopper 4. The columns 16 and the concave frames 15 play a role in fixing the guiding hopper 4 and the material spraying pipe 17. The material spraying pipe 17 is fixed to the lower end of the concave frame 15.

[0022] The pushing piece includes a conical frame 22 extending in the middle of the column frame 13. A reciprocating frame 23 is rotatably installed at the end of the conical frame 22. The conical frame 22 plays a role in connecting the reciprocating frame 23. A Y-shaped frame 26 extends from the side of the concave frame 15. Both ends of the Y-shaped frame 26 are rotatably installed through with crankshafts 25. The Y-shaped frame 26 plays a role in carrying the crankshafts 25. A pin shaft 24 is inlaid through between the ends of the two crankshafts 25. The end of the reciprocating frame 23 is rotatably connected to the pin shaft 24. The pin shaft 24 plays a role in connecting the reciprocating frame 23 and the crankshafts 25 together. The rotation of the crankshafts 25 drives the reciprocating frame 23 to move, so as to continuously push the column frame 13 to make it move.

[0023] A machine base 27 is fixedly installed on the side of the concave frame 15 near the Y-shaped frame 26. A motor 14 is fixedly installed at the upper end of the machine base 27. The machine base 27 plays a role in fixing the motor 14. The output end of the motor 14 is fixed to one of the crankshafts 25. The motor 14 plays a role in driving the crankshaft 25 to rotate.

[0024] The material control part includes a sliding hopper 3 which is inclined and fixedly installed at the upper end of the guiding hopper 4. The upper end of the column 16 is fixed to the sliding hopper 3. The sliding hopper 3 serves to guide the raw material powder to fall in a curtain shape into the guiding hopper 4. A connecting shaft 19 is rotatably installed through the outlet of the sliding hopper 3. A discharging plate 18 extends on the outer surface of the connecting shaft 19. The connecting shaft 19 serves to carry the discharging plate 18. The discharging plate 18 can control the material, thereby controlling the thickness of the raw material curtain and making the thickness of the curtain in a relatively thin range. At both ends of the connecting shaft 19, a dialing plate frame 20 is fixedly installed. The dialing plate frame 20 is elastically connected to the sliding hopper 3. The dialing plate frame 20 serves to dial the discharging plate 18. At the upper end of the column frame 13, two sealing material frames 12 symmetrically extend. The end of the sealing material frame 12 abuts against one side of the dialing plate frame 20. The sealing material frame 12 on the column frame 13 will push the dialing plate frame 20, thereby controlling the flipping of the discharging plate 18.

[0025] At the lower end of the sliding hopper 3, two hopper connecting seats 35 symmetrically extend. The end of the hopper connecting seat 35 is rotatably installed with a limiting column 34. The hopper connecting seat 35 serves to connect the limiting column 34. A limiting sleeve 33 is slidably installed on the outer surface of the limiting column 34. The end of the limiting sleeve 33 is rotatably installed with a connecting seat 36. The limiting column 34 and the limiting sleeve 33 serve to prevent the pushing plate spring 21 from bending. The end of the connecting seat 36 is fixed to the other side of the dialing plate frame 20. The connecting seat 36 serves to connect the limiting sleeve 33. A pushing plate spring 21 is arranged outside the limiting sleeve 33 and the limiting column 34. The pushing plate spring 21 can drive the dialing plate frame 20 to move, thereby controlling the flipping of the discharging plate 18.

[0026] During granulation, the raw material powder is discharged onto the sliding hopper 3 and falls in the form of a material curtain inside the guiding hopper 4. At this time, the motor 14 operates to drive the crankshaft 25 to rotate, which in turn drives the reciprocating frame 23 to move, continuously pushing the column frame 13 to make it move, so as to use the moving column frame 13 to drive the first extrusion plate 5 to move left and right continuously. At the same time, the column frame 13 will also drive the second extrusion plate 10 on the bridge frame 11 to move left and right continuously along a movement trajectory opposite to that of the first extrusion plate 5 under the action of the exchange gear 28 and the exchange tooth plate 29. That is, when the multiple vertical extrusion sheets 31 arranged vertically on the first extrusion plate 5 push the raw material curtain and then retract, the multiple horizontal extrusion sheets 32 arranged horizontally on the second extrusion plate 10 will extend to push the raw material curtain again. This cycle is repeated, and the large-particle raw materials mixed in the raw material powder are refined and removed under multiple pushings in different directions. Subsequently, the raw material curtain passes through the guiding hopper 4, and at the same time, the slurry spraying pipe 17 sprays the slurry onto the raw materials. At this time, the raw materials fall into the rotating drum 2 and roll, so as to moisten the fine powder particles with the water in the slurry, and form particles through collision and rolling agglomeration, and are discharged from the discharge port of the drum 2, thus completing the granulation of diammonium phosphate. During this process, when the column frame 13 drives the vertical extrusion sheets 31 to retract, the sealing material frame 12 on the column frame 13 will push the baffle plate frame 20, causing the connecting shaft 19 to rotate, which in turn drives the discharging plate 18 to turn over, so as to close the discharge port of the sliding hopper 3. At the same time, the column 34 is restricted to slide inside the restricting sleeve 33, and the push plate spring 21 contracts and deforms. When the column frame 13 drives the vertical extrusion sheets 31 to extend, the baffle plate frame 20 will be pushed by the push plate spring 21 that has recovered from deformation due to the loss of the push of the sealing material frame 12, causing the discharging plate 18 to flip, so as to open the discharge port of the sliding hopper 3 to discharge a small amount of raw material powder. This cycle is repeated to control the thickness of the raw material curtain so that the thickness of the curtain is within a relatively thin range. On the one hand, this facilitates the vertical extrusion sheets 31 and the horizontal extrusion sheets 32 to push the large particles in the raw materials to ensure that the vertical extrusion sheets 31 and the horizontal extrusion sheets 32 fully remove the large particles in the raw material powder. On the other hand, a relatively thin material curtain can ensure that the slurry sprayed by the slurry spraying pipe 17 acts evenly on the raw materials, forming a thin and uniform bonding layer on the surface of the raw materials, thus ensuring that the structure of the particles is dense after growth.

[0027] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A granulation device for diammonium phosphate, comprising a drum base (1) and a rotating drum (2) which is inclined and rotatably installed at the upper end of the drum base (1), characterized in that: A guiding hopper (4) is provided at the feeding port of the rotary drum (2). A material control member is provided at the upper end of the guiding hopper (4). A spraying pipe (17) is provided below the guiding hopper (4). A plurality of first squeezing plates (5) and a plurality of second squeezing plates (10) are slidably arranged in a uniform distribution in the middle of the side surface of the guiding hopper (4). The first squeezing plates (5) and the second squeezing plates (10) are arranged in a staggered manner. A plurality of vertical squeezing sheets (31) extend vertically in a linear array on the side surface of the first squeezing plate (5). A plurality of horizontal squeezing sheets (32) extend horizontally in a linear array on the side surface of the second squeezing plate (10). The vertical squeezing sheets (31) and the horizontal squeezing sheets (32) all slide through the side surface of the guiding hopper (4) and into the interior of the guiding hopper (4). A column frame (13) is fixedly installed on the side surface of a plurality of the first squeezing plates (5). A bridge frame (11) is fixedly installed on the side surface of a plurality of the second squeezing plates (10). Exchange toothed plates (29) are fixedly installed on the opposite surfaces of the bridge frame (11) and the column frame (13). The exchange toothed plate (29) on the column frame (13) is located above the exchange toothed plate (29) on the bridge frame (11). An exchange gear (28) is meshed between the two exchange toothed plates (29). The exchange gear (28) is connected to the guiding hopper (4). A pushing sheet member is connected to the middle of the column frame (13).

2. The granulation equipment for diammonium phosphate according to claim 1, characterized in that: A bearing frame (30) is fixedly installed at the lower edge of the side surface of the guiding hopper (4). The exchange gear (28) is rotatably installed at the end of the bearing frame (30).

3. The granulation equipment for diammonium phosphate according to claim 1, characterized in that: Ends of two of the first squeezing plates (5) located at the upper and lower edges both extend with first plate ears (7). A first guide post (6) is slidably installed through the end of the first plate ear (7). The end of the first guide post (6) is fixed to the guiding hopper (4). Ends of two of the second squeezing plates (10) located at the upper and lower edges both extend with second plate ears (9). A second guide post (8) is slidably installed through the end of the second plate ear (9). The end of the second guide post (8) is fixed to the guiding hopper (4).

4. The granulation equipment for diammonium phosphate according to claim 1, wherein: Two upright columns (16) are symmetrically and fixedly installed at the end of the drum base (1). A concave frame (15) is inlaid on the outer surface of the two upright columns (16). The end of the concave frame (15) is fixed to the guiding hopper (4). The spraying pipe (17) is fixed to the lower end of the concave frame (15).

5. The granulating equipment for diammonium phosphate according to claim 4, characterized in that: The pushing sheet member includes a tapered frame (22) extending in the middle of the column frame (13). A reciprocating frame (23) is rotatably installed at the end of the tapered frame (22). A Y-shaped frame (26) extends from the side surface of the concave frame (15). Two crankshafts (25) are rotatably installed through both ends of the Y-shaped frame (26). A pin shaft (24) is inlaid through between the ends of the two crankshafts (25). The end of the reciprocating frame (23) is rotatably connected to the pin shaft (24).

6. The granulation equipment for diammonium phosphate according to claim 5, characterized in that: A machine base (27) is fixedly installed on the side surface of the concave frame (15) near the Y-shaped frame (26). A motor (14) is fixedly installed at the upper end of the machine base (27). The output end of the motor (14) is fixed to one of the crankshafts (25).

7. A granulation device for diammonium phosphate according to claim 4, characterized in that: The material control part includes a sliding hopper (3) which is fixedly installed obliquely at the upper end of the guiding hopper (4). The upper end of the upright column (16) is fixed to the sliding hopper (3). A connecting shaft (19) is rotatably installed through the outlet of the sliding hopper (3). A discharging plate (18) extends on the outer surface of the connecting shaft (19). Both ends of the connecting shaft (19) are fixedly installed with a dial plate frame (20). The dial plate frame (20) is elastically connected to the sliding hopper (3). Two sealing material frames (12) symmetrically extend from the upper end of the column frame (13). The end of the sealing material frame (12) abuts against one side of the dial plate frame (20).

8. The granulation equipment for diammonium phosphate according to claim 7, characterized in that: Two hopper connecting seats (35) symmetrically extend from the lower end of the sliding hopper (3). A limiting column (34) is rotatably installed at the end of the hopper connecting seat (35). A limiting sleeve (33) is slidably installed on the outer surface of the limiting column (34). A frame connecting seat (36) is rotatably installed at the end of the limiting sleeve (33). The end of the frame connecting seat (36) is fixed to the other side of the dial plate frame (20). A push plate spring (21) is arranged between the limiting sleeve (33) and the outer side of the limiting column (34).

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