Pump shell welding device of asphalt pump

Abstract

The invention discloses a pump shell welding device of an asphalt pump, relates to the technical field of welding, and solves the problems that when a first activated carbon filter screen and a second activated carbon filter screen in a box body are in a high-temperature environment, the adsorption rate of activated carbon is increased but the adsorption capacity is reduced in the high-temperature environment, so that the adsorption capacity of the activated carbon is reduced; the device comprises a welding machine tool, a protective cover is fixedly installed at the upper end of the welding machine tool, a mechanical arm is installed on the inner side of the protective cover, two first guide pipes communicating with the protective cover are fixedly installed at the upper end of the protective cover, and impellers are fixedly installed on the inner sides of the first guide pipes; by installing the filtering mechanism, high-temperature flue gas can be prevented from entering the filtering box to affect the adsorption capacity of the activated carbon bag, particulate matter in welding flue gas can be filtered out through cooling water, the purification burden of the activated carbon bag on the welding flue gas can be effectively relieved, and therefore the service life of the activated carbon bag can be prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of welding, in particular to a pump casing welding device for an asphalt pump. Background Art

[0002] Asphalt pump is a centrifugal pump, the core part of which is the rotor. When the rotor rotates, a certain volume is formed between the rotor and the pump casing, which sucks the liquid from the suction port and discharges the liquid through the centrifugal force of the impeller. When assembling the asphalt pump casing, welding equipment is needed to connect the pump casing parts.

[0003] The existing Chinese patent CN114654134B discloses a pump housing welding device for recycling steel slag. Through the provided purification component, when in use, the exhaust fan quickly discharges the exhaust gas generated by welding into the exhaust pipe, and is sent into the box of the purification component by the blower through the exhaust pipe. After the exhaust gas enters the purification chamber, it needs to be purified and filtered by the first activated carbon filter and the second activated carbon filter in sequence before it can be discharged. However, during the electric welding process, the temperature of the welding arc can reach several thousand degrees Celsius, and the temperature of the welding fume is also high. The high-temperature welding fume enters the box in the purification component through the exhaust pipe, which will cause the temperature in the box to rise, so that the first activated carbon filter and the second activated carbon filter in the box are in a high-temperature environment. The adsorption rate of activated carbon increases under high-temperature conditions, but the adsorption capacity decreases, thereby reducing the adsorption capacity of activated carbon, making the device have a poor purification effect on welding fume. Summary of the invention

[0004] The object of the present invention is to provide a pump casing welding device for an asphalt pump to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A pump casing welding device for an asphalt pump comprises a welding machine, a protective cover is fixedly installed on the upper end of the welding machine, a mechanical arm is installed on the inner side of the protective cover, two ducts one interconnected with each other are fixedly installed on the upper end of the protective cover, an impeller is fixedly installed on the inner side of the duct one, and a filtering mechanism is also included for filtering and purifying welding fumes, the filtering mechanism is installed at one end of the duct one away from the protective cover; a condensing assembly for condensing gas, the condensing assembly is installed inside the filtering mechanism; a water filtering assembly is used to filter moisture in the gas, the water filtering assembly is installed inside the filtering mechanism and is located on the upper side of the condensing assembly; a connecting assembly is used to drive the condensing assembly and the water filtering assembly to vibrate, the connecting assembly is installed between the condensing assembly and the water filtering assembly.

[0007] Preferably, the filtering mechanism includes a water tank installed on the rear side of the welding machine, the lower end of the conduit 1 is provided with an inclined portion, and the inclined portion passes through the water tank, the inclined portion is used to prevent residual water from accumulating in the conduit 1, the upper end of the water tank is fixedly equipped with a water inlet pipe interconnected with the water tank, and the front side of the water tank is fixedly equipped with a drain pipe interconnected with the water tank.

[0008] Preferably, a sealing door is installed on the rear side of the water tank near its lower end. After the sealing door is opened, debris in the water tank can be cleaned and collected. A duct two is fixedly embedded in the center of the upper end of the water tank, a fan one is fixedly installed on the upper end of the duct two, a motor is fixedly installed on the upper end of the fan one, a duct three is fixedly installed on the outer side of the fan one and is interconnected with the fan one, and an end of the duct three away from the fan one is fixedly connected to a filter box.

[0009] Preferably, an activated carbon bag is installed inside the filter box, and a filter cover is fixedly installed at one end of the drain pipe inside the water tank, and the filter cover is located on the lower side of one of the inclined portions. The filter cover is used to prevent debris in the water tank from being discharged through the drain pipe. A slope portion is provided at the inner bottom end of the water tank, and the filter cover is located on the upper side of the higher end of the slope portion.

[0010] Preferably, the condensing assembly includes a condensing coil installed on the inner side of the second conduit, the outer side of the condensing coil is fixedly sleeved with a second collar, and the outer diameter of the second collar is equal to the inner diameter of the second conduit, support frames are fixedly installed on the upper and lower sides of the condensing coil, and the connection between the support frame and the second collar is a fixed connection, and a spring is fixedly installed on the lower end of the second collar, and the spring is used to drive the condensing coil to move upward.

[0011] Preferably, the lower end of the spring is fixedly connected with a support ring 2, and the connection between the support ring 2 and the conduit 2 is a fixed connection, and the upper end of the support ring 2 is fixedly installed with a plurality of pins distributed at equal distances corresponding to the outer side of the spring, and the pins pass through the ring 2. Both ends of the condensing coil are fixedly connected with metal bent tubes, the condensing coil is used to cool the gas, and the two metal bent tubes are staggered, and a soft conduit is fixedly sleeved on the outer side of the metal bent tube with the port facing upward, and the end of the soft conduit away from the metal bent tube is connected to the water inlet pipe.

[0012] Preferably, the water filtration assembly includes a connecting shaft fixedly connected to the fan shaft, the lower end of the connecting shaft is fixedly connected to a connecting seat, a fiber filter is movably sleeved on the outer side of the connecting seat, a ring is movably sleeved on the outer side of the fiber filter, and the upper and lower sides of the fiber filter are movably abutted with multiple connecting rods equidistantly distributed in a circle, and the fiber filter can reduce moisture in the gas.

[0013] Preferably, the two ends of the connecting rod are respectively fixedly connected to the connecting seat and the ring 1, the upper and lower sides of the ring 1 are movably fitted with a support ring 1, and the connection between the support ring 1 and the conduit 2 is a fixed connection, and a plurality of balls equidistantly distributed in a circle are movably embedded on the outer side of the ring 1, the balls are used to reduce the friction between the ring 1 and the conduit 2, and the connection between the balls and the inner wall of the conduit 2 is rolling contact.

[0014] Preferably, the connecting assembly includes a plurality of push rods fixedly mounted on a lower end of the collar, and the plurality of push rods are circumferentially equidistantly distributed, a hemispherical portion is provided at the lower end of the push rod, and a plurality of baffles circumferentially equidistantly distributed are fixedly mounted on the upper end of the collar, the thickness of the baffle is smaller than the radius of the hemispherical portion, and the spacing between two adjacent baffles is greater than the diameter of the hemispherical portion, and the connection between the hemispherical portion and the plurality of baffles is sliding contact.

[0015] Preferably, the lower end of the activated carbon bag is movably abutted against a grille support plate, and the grille support plate and the filter box are connected in a fixed manner, the upper end of the filter box is movably embedded with a cover plate, and a second fan is fixedly embedded at the center of the upper end of the cover plate, the upper end of the cover plate is movably abutted against two symmetrically distributed lock plates, the lock plates are used to prevent the cover plate from detaching from the filter box, and the lock plates and the filter box are connected in a rotating manner.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention installs a filtering mechanism. After the welding fume enters the cooling water in the water tank, the cooling water can cool the welding fume, thereby preventing high-temperature fume from entering the filter box and affecting the adsorption capacity of the activated carbon bag. The cooling water can also filter out particulate matter in the welding fume, which can effectively reduce the purification burden of the activated carbon bag on the welding fume, thereby extending the service life of the activated carbon bag.

[0018] 2. The present invention installs a cooling component and a water filter component, and the condensing coil contacts the gas that has been cooled and purified by cooling water, which can further cool the gas. The gas contacts the condensing coil with a lower temperature, which can condense the moisture in the gas into water droplets. The fiber filter in the water filter component is used to filter the gas, which can effectively reduce the moisture content in the gas and prevent the gas with a large moisture content from entering the activated carbon bag and reducing the adsorption efficiency of the activated carbon.

[0019] 3. The present invention installs a connecting component. When the fan drives the ring to rotate through the connecting shaft, multiple top rods at the lower end of the ring move and slide in contact with multiple baffles through the hemispherical part. Driven by the compression force of the spring, the condensing coil can be continuously vibrated, which can assist the condensing coil to shake off water droplets and prevent the water droplets from adhering to the outer wall of the condensing coil and affecting the gas heat exchange. In addition, the fiber filter can also shake off water droplets through centrifugal force during rotation to prevent water droplets from clogging the fiber filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is an overall schematic diagram of the present invention;

[0021] Figure 2 It is a schematic diagram of the rear side of the present invention;

[0022] Figure 3 It is a side cross-sectional schematic diagram of the water tank of the present invention;

[0023] Figure 4 This is a schematic diagram of the connection between the fan and the second duct of the present invention;

[0024] Figure 5 This is a schematic diagram of the overall internal structure of the catheter 2 of the present invention;

[0025] Figure 6 This is a schematic diagram of the separation of the water filtration component and the cooling component of the present invention;

[0026] Figure 7 This is a schematic diagram of the cooling assembly disassembly of the present invention;

[0027] Figure 8 It is a side sectional schematic diagram of the filter box of the present invention.

[0028] In the figure: 1. welding machine; 2. protective cover; 3. mechanical arm; 4. conduit 1; 5. impeller; 6. water tank; 7. inclined part; 8. water inlet pipe; 9. drain pipe; 10. sealing door; 11. conduit 2; 12. fan 1; 13. motor; 14. conduit 3; 15. filter box; 16. activated carbon bag; 17. filter cover; 18. slope; 19. connecting shaft; 20. connecting seat; 21. Fiber filter; 22, collar one; 23, connecting rod; 24, support ring one; 25, ball; 26, condensing coil; 27, collar two; 28, support frame; 29, spring; 30, support ring two; 31, pin rod; 32, metal bending tube; 33, flexible conduit; 34, top rod; 35, hemispherical part; 36, baffle; 37, grille support plate; 38, cover plate; 39, fan two; 40, locking plate. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Example 1: Please refer to Figure 1-Figure 4 , Figure 8 The pump casing welding device of an asphalt pump shown in the figure includes a welding machine 1, a protective cover 2 is fixedly installed on the upper end of the welding machine 1, a mechanical arm 3 is installed on the inner side of the protective cover 2, two ducts 4 connected to each other are fixedly installed on the upper end of the protective cover 2, an impeller 5 is fixedly installed on the inner side of the duct 4, and also includes a filtering mechanism for filtering and purifying welding fumes, and the filtering mechanism is installed at one end of the duct 4 away from the protective cover 2; a condensation component for condensing gas, and the condensation component is installed inside the filtering mechanism; a water filter component for filtering moisture in the gas, and the water filter component is installed inside the filtering mechanism and is located on the upper side of the condensation component; a connecting component for driving the condensation component and the water filter component to vibrate, and the connecting component is installed between the condensation component and the water filter component.

[0031] The filtering mechanism includes a water tank 6 installed on the rear side of the welding machine 1. The lower end of the conduit 1 4 is provided with an inclined portion 7, and the inclined portion 7 passes through the water tank 6. The inclined portion 7 is used to prevent residual water from accumulating in the conduit 4. The upper end of the water tank 6 is fixedly installed with a water inlet pipe 8 interconnected with it, and the front side of the water tank 6 is fixedly installed with a drain pipe 9 interconnected with it.

[0032] A sealing door 10 is installed on the rear side of the water tank 6 near its lower end. After the sealing door 10 is opened, the debris in the water tank 6 can be cleaned and collected. A duct 2 11 is fixedly embedded in the center of the upper end of the water tank 6. A fan 12 is fixedly installed on the upper end of the duct 2 11. A motor 13 is fixedly installed on the upper end of the fan 12. A duct 3 14 connected to the fan 12 is fixedly installed on the outer side of the fan 12. The end of the duct 3 14 away from the fan 12 is fixedly connected to a filter box 15.

[0033] An activated carbon bag 16 is installed inside the filter box 15, and a filter cover 17 is fixedly installed at one end of the drain pipe 9 inside the water tank 6, and the filter cover 17 is located on the lower side of an inclined portion 7. The filter cover 17 is used to prevent debris in the water tank 6 from being discharged through the drain pipe 9. A slope portion 18 is provided at the inner bottom end of the water tank 6, and the filter cover 17 is located on the upper side of the higher end of the slope portion 18.

[0034] The lower end of the activated carbon bag 16 is movably abutted against a grille support plate 37, and the grille support plate 37 and the filter box 15 are connected in a fixed manner. A cover plate 38 is movably embedded in the upper end of the filter box 15, and a fan 39 is fixedly embedded at the center of the upper end of the cover plate 38. The upper end of the cover plate 38 is movably abutted against two symmetrically distributed lock plates 40, which are used to prevent the cover plate 38 from detaching from the filter box 15, and the lock plate 40 and the filter box 15 are connected in a rotating manner.

[0035] Working principle: During the process of welding the pump casing of the asphalt pump by the robot arm 3, the impeller 5, the motor 13 and the fan 2 39 are running, and the smoke generated in the protective cover 2 will be sent into the water tank 6 by the conduit 1 4. The cooling water in the water tank 6 circulates through the water inlet pipe 8 and the drain pipe 9. After the high-temperature welding smoke enters the cooling water, it exchanges heat with the cooling water, which can effectively reduce the temperature of the gas and prevent the high-temperature smoke from entering the filter box 15 to affect the adsorption capacity of the activated carbon bag 16. After the welding smoke enters the cooling water, the cooling water can also filter out the particulate matter in the welding smoke, which can effectively reduce the purification burden of the activated carbon bag 16 on the welding smoke, thereby extending the service life of the activated carbon bag 16.

[0036] After the gas enters the water body of the water tank 6 through the conduit 14, it can cause the water body to surge and bubble. Since the filter cover 17 is located at the lower side of the inclined portion 7 of the conduit 14, the water body around the filter cover 17 can surge greatly, which is conducive to driving the particles outside the filter cover 17 to be carried away by the water flow, and preventing the particles in the water body from clogging the filter cover 17;

[0037] When the activated carbon bag 16 needs to be replaced, the personnel rotates the locking plates 40 to rotate the two locking plates 40 away from the cover plate 38 . At this time, the personnel can remove the cover plate 38 and replace the activated carbon bag 16 in the filter box 15 .

[0038] Example 2: Please refer to Figure 5-Figure 7 This embodiment further explains Example 1. The condensing component includes a condensing coil 26 installed on the inner side of the second conduit 11. The outer side of the condensing coil 26 is fixedly sleeved with a second collar 27, and the outer diameter of the second collar 27 is equal to the inner diameter of the second conduit 11. Support frames 28 are fixedly installed on the upper and lower sides of the condensing coil 26, and the connection between the support frame 28 and the second collar 27 is a fixed connection. A spring 29 is fixedly installed at the lower end of the second collar 27, and the spring 29 is used to drive the condensing coil 26 to move upward.

[0039] The lower end of the spring 29 is fixedly connected with a support ring 2 30, and the connection between the support ring 2 30 and the conduit 2 11 is a fixed connection. The upper end of the support ring 2 30 corresponds to the outer side of the spring 29 and is fixedly installed with a plurality of pins 31 distributed at equal distances, and the pins 31 pass through the sleeve ring 27. Both ends of the condensing coil 26 are fixedly connected with metal bent tubes 32. The condensing coil 26 is used to cool the gas, and the two metal bent tubes 32 are staggered. A soft conduit 33 is fixedly sleeved on the outer side of the metal bent tube 32 with the port facing upward, and the end of the soft conduit 33 away from the metal bent tube 32 is connected to the water inlet pipe 8.

[0040] The water filtering assembly includes a connecting shaft 19 fixedly connected to the rotating shaft of the fan 12, the lower end of the connecting shaft 19 is fixedly connected to a connecting seat 20, a fiber filter 21 is movably sleeved on the outer side of the connecting seat 20, a collar 22 is movably sleeved on the outer side of the fiber filter 21, and the upper and lower sides of the fiber filter 21 are movably abutted with a plurality of connecting rods 23 equidistantly distributed in a circle, and the fiber filter 21 can reduce the moisture in the gas.

[0041] The two ends of the connecting rod 23 are fixedly connected to the connecting seat 20 and the ring 1 22 respectively, and the upper and lower sides of the ring 1 22 are movably fitted with a support ring 1 24, and the connection between the support ring 1 24 and the conduit 2 11 is a fixed connection. A plurality of balls 25 equidistantly distributed around the circumference are movably embedded on the outer side of the ring 1 22, and the balls 25 are used to reduce the friction between the ring 1 22 and the conduit 2 11, and the connection between the balls 25 and the inner wall of the conduit 2 11 is rolling contact.

[0042] In this embodiment: the gas filtered by the water in the water tank 6 will enter the conduit 2 11 and contact the condensing coil 26. At this time, the gas exchanges heat with the condensing coil 26, which can further reduce the temperature of the gas. When the gas contacts the condensing coil 26 with a lower temperature, the moisture content in the gas can be effectively reduced. In the process of injecting cold water into the water tank 6 through the water inlet pipe 8, part of the cold water enters the condensing coil 26 through the soft conduit 33. The water in the condensing coil 26 that has exchanged heat with the gas is directly discharged into the water tank 6 through the metal bending pipe 32, which can keep the condensing coil 26 at a lower temperature.

[0043] The gas after heat exchange with the condensing coil 26 will be filtered through the fiber filter 21, and the fiber filter 21 can filter out the moisture in the gas, further reduce the moisture content in the gas, and prevent the gas with a large moisture content from entering the activated carbon bag 16 to reduce the adsorption efficiency of the activated carbon.

[0044] Example 3: Please refer to Figure 5 , Figure 6This embodiment further explains Example 2, the connecting assembly includes a plurality of push rods 34 fixedly mounted on the lower end of the collar 1 22, and the plurality of push rods 34 are equidistantly distributed around the circumference, a hemispherical portion 35 is provided at the lower end of the push rod 34, a plurality of baffles 36 equidistantly distributed around the circumference are fixedly mounted on the upper end of the collar 27, the thickness of the baffle 36 is less than the radius of the hemispherical portion 35, and the spacing between two adjacent baffles 36 is greater than the diameter of the hemispherical portion 35, and the connection between the hemispherical portion 35 and the plurality of baffles 36 is sliding contact.

[0045] In this embodiment: during the operation of the fan 12, the rotating shaft in the fan 12 drives the fiber filter 21 and the collar 22 to rotate through the connecting shaft 19. During the rotation of the fiber filter 21, the water droplets filtered by the fiber filter 21 can be thrown away by the centrifugal force to prevent the water droplets from clogging the fiber filter 21.

[0046] The ring 22 will drive the multiple push rods 34 to rotate during the rotation process. The hemispherical parts 35 of the multiple push rods 34 will slide in contact with the multiple baffles 36 during the rotation process. The compression force of the spring 29 can drive the condensing coil 26 and the fiber filter 21 to produce continuous vibration, which can help the condensing coil 26 to shake off water droplets and prevent the water droplets from adhering to the outer wall of the condensing coil 26 and affecting the gas heat exchange.

[0047] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0048] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pump casing welding device for an asphalt pump, comprising a welding machine (1), a protective cover (2) being fixedly mounted on the upper end of the welding machine (1), a mechanical arm (3) being mounted on the inner side of the protective cover (2), two conduits (4) being fixedly mounted on the upper end of the protective cover (2) and being interconnected, an impeller (5) being fixedly mounted on the inner side of the conduit (4), characterized in that: Also includes: A filter mechanism, used for filtering and purifying welding fumes, the filter mechanism being installed at an end of the conduit 1 (4) away from the protective cover (2); A condensation component, used for condensing the gas, wherein the condensation component is installed inside the filtering mechanism; A water filter assembly, used for filtering water in the gas, the water filter assembly is installed inside the filter mechanism and is located on the upper side of the condensation assembly; The connecting component is used to drive the condensing component and the water filtering component to vibrate, and the connecting component is installed between the condensing component and the water filtering component.

2. The pump casing welding device of an asphalt pump according to claim 1, characterized in that: The filtering mechanism comprises a water tank (6) installed at the rear side of the welding machine (1); the lower end of the conduit 1 (4) is provided with an inclined portion (7), and the inclined portion (7) passes through the water tank (6); the upper end of the water tank (6) is fixedly installed with a water inlet pipe (8) which is in communication with the water tank (6); and the front side of the water tank (6) is fixedly installed with a drainage pipe (9) which is in communication with the water tank (6).

3. The pump casing welding device of an asphalt pump according to claim 2, characterized in that: A sealing door (10) is installed on the rear side of the water tank (6) near its lower end, a second conduit (11) is fixedly embedded at the center of the upper end of the water tank (6), a fan (12) is fixedly installed on the upper end of the second conduit (11), a motor (13) is fixedly installed on the upper end of the fan (12), a third conduit (14) in communication with the fan (12) is fixedly installed on the outer side of the fan (12), and a filter box (15) is fixedly connected to the end of the third conduit (14) away from the fan (12).

4. The pump casing welding device of an asphalt pump according to claim 3 is characterized in that: An activated carbon bag (16) is installed inside the filter box (15); a filter cover (17) is fixedly installed at one end of the drain pipe (9) located inside the water tank (6), and the filter cover (17) is located at the lower side of one of the inclined portions (7); a slope portion (18) is provided at the inner bottom end of the water tank (6), and the filter cover (17) is located at the upper side of the higher end of the slope portion (18).

5. The pump casing welding device of an asphalt pump according to claim 3, characterized in that: The condensation assembly includes a condensation coil (26) installed on the inner side of the second conduit (11), the outer side of the condensation coil (26) is fixedly sleeved with a second collar (27), and the outer diameter of the second collar (27) is equal to the inner diameter of the second conduit (11), the upper and lower sides of the condensation coil (26) are fixedly mounted with support frames (28), and the connection between the support frame (28) and the second collar (27) is a fixed connection, and the lower end of the second collar (27) is fixedly mounted with a spring (29).

6. The pump casing welding device of an asphalt pump according to claim 5, characterized in that: The lower end of the spring (29) is fixedly connected to a support ring 2 (30), and the connection between the support ring 2 (30) and the conduit 2 (11) is a fixed connection. The upper end of the support ring 2 (30) corresponds to the outer side of the spring (29) and is fixedly installed with a plurality of pins (31) distributed at equal distances, and the pins (31) penetrate the sleeve ring 2 (27). Both ends of the condensing coil (26) are fixedly connected to metal bent tubes (32), and the two metal bent tubes (32) are staggered. The outer side of the metal bent tube (32) with the port facing upward is fixedly sleeved with a soft conduit (33), and the end of the soft conduit (33) away from the metal bent tube (32) is connected to the water inlet pipe (8).

7. The pump casing welding device of an asphalt pump according to claim 5, characterized in that: The water filter assembly comprises a connecting shaft (19) fixedly connected to the rotating shaft of the fan (12); the lower end of the connecting shaft (19) is fixedly connected to a connecting seat (20); a fiber filter (21) is movably sleeved on the outer side of the connecting seat (20); a collar (22) is movably sleeved on the outer side of the fiber filter (21); and a plurality of connecting rods (23) movably abutted against each other at equidistant intervals around the circumference are provided on both upper and lower sides of the fiber filter (21).

8. The pump casing welding device of an asphalt pump according to claim 7, characterized in that: The two ends of the connecting rod (23) are respectively fixedly connected to the connecting seat (20) and the collar (22); the upper and lower sides of the collar (22) are movably fitted with a support ring (24); the connection between the support ring (24) and the conduit (11) is a fixed connection; a plurality of balls (25) equidistantly distributed in a circumference are movably embedded on the outer side of the collar (22); and the connection between the balls (25) and the inner wall of the conduit (11) is a rolling contact.

9. The pump casing welding device of an asphalt pump according to claim 7, characterized in that: The connection assembly comprises a plurality of push rods (34) fixedly mounted on the lower end of the first collar (22), and the plurality of push rods (34) are equidistantly distributed around the circumference, a hemispherical portion (35) is provided at the lower end of the push rod (34), and a plurality of baffles (36) equidistantly distributed around the circumference are fixedly mounted on the upper end of the second collar (27), and the spacing between two adjacent baffles (36) is greater than the diameter of the hemispherical portion (35), and the connection between the hemispherical portion (35) and the plurality of baffles (36) is a sliding contact.

10. The pump casing welding device of an asphalt pump according to claim 4, characterized in that: The lower end of the activated carbon bag (16) is movably abutted against a grille support plate (37), and the grille support plate (37) and the filter box (15) are connected in a fixed manner. The upper end of the filter box (15) is movably embedded with a cover plate (38), and a second fan (39) is fixedly embedded at the center of the upper end of the cover plate (38). The upper end of the cover plate (38) is movably abutted against two symmetrically distributed lock plates (40), and the lock plate (40) and the filter box (15) are connected in a rotating manner.

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