Filter element end surface coating device

Abstract

The utility model discloses a filter element end face wrapping device which comprises a machine base, a welding station, an end face wrapping device and a driving device, wherein the machine base is provided with a welding station used for placing a filter element; the welding assembly is movably arranged on the machine base, and the welding assembly is provided with a heating head which enables a part of the circular ring diaphragm to abut against the end face of the cylinder body; the driving mechanism can drive the heating head to do circular motion around the axis of the cylinder main body relative to the filter element. When the two ends of the filter membrane need to be welded to the end face of the cylinder body, the filter element is placed on a welding station, the heating head enables a part of the annular membrane to abut against the end face of the cylinder body, and when the driving mechanism drives the heating head to do circular motion around the axis of the cylinder body relative to the filter element, the annular membrane is welded to the end face of the cylinder body. Therefore, the circular ring membranes can be completely hot-pressed on the end face of the cylinder main body in a circle and form a plurality of folding parts with multiple layers of stacked circular ring membranes, so that the filter membrane is automatically welded on the end face of the cylinder main body, the assembly efficiency is high, and the formed folding parts are stable in quality and not easy to leak.

Description

Technical Field

[0001] The utility model relates to a filter element end surface covering device. Background Art

[0002] The cylindrical filter element is a new type of deep filter element. It has the excellent adsorption performance of granular activated carbon, high filtration accuracy, long service life, non-toxic and odorless, so it is widely used. Generally speaking, see Figure 1 and Figure 2 The cylindrical filter element includes a cylindrical body 11 and a filter membrane 13 wrapped around the outside of the cylindrical body 11. The filter membrane 13 is generally made of non-woven fabric. When the filter membrane 13 is wrapped around the outside of the cylindrical body 11, the filter membrane 13 is first surrounded by the outer peripheral wall of the cylindrical body 11 for at least one circle, and the two ends of the filter membrane 13 are partially extended from the two ends of the cylindrical body 11, and then the part of the filter membrane 13 extending from the cylindrical body 11 is plastic welded to the end surface of the cylindrical body 11, so that the filter membrane completely wraps the cylindrical body 11. Among them, the part of the filter membrane extending out of the end face of the cylindrical body 11 is an annular diaphragm 14. When the annular diaphragm 14 is plastic welded to the end face of the cylindrical body 11, a plurality of folded portions 15 formed by overlapping multiple layers of filter membranes are formed. At present, the above-mentioned assembly steps need to be completed manually, which not only leads to low production efficiency, but also makes it difficult to ensure the welding effect of the filter membrane 13 located on the end face of the cylindrical body 11. If the welding effect of the folded portion 15 is not good, leakage is likely to occur, which affects the service life of the cylindrical filter element and its filtering effect. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a filter element end surface coating device which can realize automatic welding of a filter membrane on the end surface of a cylindrical body, has high assembly efficiency and stable quality.

[0004] According to a filter element end surface covering device of an embodiment of the utility model, the filter element includes a cylindrical main body and a filter membrane wrapped on the outside of the cylindrical main body, and both ends of the filter membrane have annular diaphragms extending from the ends of the cylindrical main body, including: a machine base, the machine base is provided with a welding station for placing the filter element; a welding assembly, movably arranged on the machine base, the welding assembly has a heating head for abutting a part of the annular diaphragm against the end face of the cylindrical main body; a driving mechanism, which can drive the heating head to make a circular motion around the axis of the cylindrical main body relative to the filter element, so as to heat-press all the annular diaphragms to the end face of the cylindrical main body and form a plurality of folded parts with a multi-layer structure.

[0005] A filter element end surface coating device according to an embodiment of the utility model has at least the following beneficial effects:

[0006] When it is necessary to weld the two ends of the filter membrane to the end face of the cylinder body, the filter element is placed on the welding station, and the heating head of the welding assembly abuts a part of the annular diaphragm against the end face of the cylinder body. When the driving mechanism drives the heating head to move in a circle around the axis of the cylinder body relative to the filter element, the annular diaphragm can be hot-pressed on the end face of the cylinder body in a circle to form a plurality of folded portions with multiple layers of annular diaphragms stacked on top of each other, thereby realizing automatic welding of the filter membrane on the end face of the cylinder body, with high assembly efficiency, and the formed folded portions are of stable quality and not prone to leakage.

[0007] In some embodiments of the utility model, the machine base is rotatably provided with a first rotating roller and a second rotating roller which are parallel to each other and arranged at intervals, and the machine base is movably raised and lowered with a lower pressure roller located above the first rotating roller and the second rotating roller, and the lower pressure roller, the first rotating roller and the second rotating roller can simultaneously contact the outer peripheral wall of the filter element to jointly define the welding station, and the driving mechanism drives at least one of the lower pressure roller, the first rotating roller and the second rotating roller to rotate to drive the filter element to rotate around its axis.

[0008] In some embodiments of the utility model, the first rotating roller is rotatably arranged on the machine base via a first rotating shaft, the second rotating roller is rotatably arranged on the machine base via a second rotating shaft, the driving mechanism includes a first pulley and a second pulley fixedly arranged at both ends of the first rotating shaft, the first pulley is connected to a first motor via a first belt, a third pulley is fixedly arranged at one end of the second rotating shaft close to the second pulley, the third pulley is connected to the second pulley via a second belt, the lower pressure roller is rotatably arranged on the lifting seat, and the lifting seat is connected to a lifting driver for driving it to move up and down.

[0009] In some embodiments of the utility model, a movable seat is provided on the machine base, the welding assembly is installed on the movable seat, the movable seat is connected to an adjustment mechanism that drives it to move left and right and forward and backward relative to the machine base so that the heating head is aligned with a part of the end surface of the cylindrical body, and a positioning mechanism is provided on the movable seat located on one side of the welding assembly, and the positioning mechanism is used to limit the position of the end surface of the filter element.

[0010] In some embodiments of the utility model, the positioning mechanism includes a rod member arranged parallel to the cylindrical body, one end of the rod member is connected to a linear driver for driving its telescopic movement, the other end of the rod member is connected to a positioning block for contacting the end surface of the cylindrical body, the positioning block is connected to a positioning needle capable of abutting against the inner circumferential wall of the cylindrical body, and the positioning block can rotate around the axial direction of the rod member to allow the positioning needle to swing up and down for adjustment.

[0011] In some embodiments of the utility model, the adjustment mechanism includes a first screw assembly arranged in the left-right direction and a second screw assembly arranged in the front-back direction, the first screw assembly is connected to a sliding seat that can move left and right relative to the machine base, and the movable seat is connected to the second screw assembly to move forward and backward relative to the sliding seat.

[0012] In some embodiments of the utility model, the heating head is rotatably arranged on the movable seat through a rotating drive, and a conical outer circumferential surface is provided at one end of the heating head facing the filter element. The conical outer circumferential surface is circumferentially arranged around the rotation axis of the heating head, and the larger end of the conical outer circumferential surface is closer to the axis of the filter element than the smaller end of the conical outer circumferential surface. The conical outer circumferential surface can abut against the end edge of the annular diaphragm to guide the annular diaphragm to fold toward the inner circumference of the cylindrical body.

[0013] In some embodiments of the utility model, a plurality of grooves are distributed circumferentially at intervals around the rotation axis of the heating head on the outer circumferential surface of the truncated cone, and the grooves are in the shape of elongated strips and extend along the generatrix direction of the outer circumferential surface of the truncated cone.

[0014] In some embodiments of the utility model, the rotary driver includes a second motor and a drive sleeve driven by the second motor, a conductive slip ring is provided at one end of the drive sleeve, the heating head is connected to the other end of the drive sleeve through a sleeve piece, and the wires between the conductive slip ring and the heating head are passed through the interior of the sleeve piece and the drive sleeve.

[0015] In some embodiments of the utility model, two welding assemblies are provided, and the two welding assemblies are respectively located on the left and right sides of the welding station, so that the two heating heads can act on the two ends of the filter element at the same time.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 It is a schematic diagram of the structure when the end of the filter element is not welded;

[0019] Figure 2 It is a schematic diagram of the structure after the end of the filter element is welded;

[0020] Figure 3 It is a structural schematic diagram of an embodiment of the filter element end surface coating device of the utility model;

[0021] Figure 4 for Figure 3 A schematic diagram of a partial structure of an embodiment;

[0022] Figure 5 for Figure 3 A schematic structural diagram of a driving mechanism of an embodiment;

[0023] Figure 6 It is a schematic diagram of the structure when the heating head is close to the annular diaphragm of the filter element.

[0024] Reference numerals:

[0025] Filter element 10; cylindrical body 11; filter membrane 13; annular diaphragm 14; folding portion 15; machine base 100; welding assembly 200; heating head 210; truncated cone outer circumference 220; groove portion 230; first rotating roller 310; second rotating roller 320; first pulley 311; second pulley 312; first rotating shaft 313; third pulley 321; second rotating shaft 322; lower pressure roller 400; lifting drive 410; lifting seat 420; first motor 500; adjustment mechanism 600; first lead screw assembly 610; second lead screw assembly 620; sliding seat 630; movable seat 640; positioning mechanism 700; rod 710; linear drive 720; positioning block 730; positioning pin 740; rotary drive 800; second motor 810; drive shaft sleeve 820; conductive slip ring 830; sleeve member 840. DETAILED DESCRIPTION

[0026] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0027] In the description of the present invention, it should be understood that descriptions involving orientation, such as the orientations or positional relationships indicated by terms such as "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside", etc., are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used to distinguish the technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] See also Figures 1 to 6 , a filter element end surface coating device according to an embodiment of the utility model is applied to a filter element 10, wherein the filter element 10 includes a cylindrical body 11 and a filter membrane 13 wrapped around the outside of the cylindrical body 11, and both ends of the filter membrane 13 have annular diaphragms 14 extending from the ends of the cylindrical body 11, and the filter element end surface coating device includes: a machine base 100, on which a welding station for placing the filter element 10 is provided; a welding assembly 200, which is movably arranged on the machine base 100, and the welding assembly 200 has a heating head 210 for abutting a part of the annular diaphragm 14 against the end surface of the cylindrical body 11; a driving mechanism, which can drive the heating head 210 to perform a circular motion around the axis of the cylindrical body 11 relative to the filter element 10, so as to heat-press all the annular diaphragms 14 to the end surface of the cylindrical body 11 and form a plurality of folded portions 15 with a multi-layer structure.

[0031] When it is necessary to weld the two ends of the filter membrane 13 to the end surface of the cylindrical body 11, the filter element 10 is placed on the welding station, and the heating head 210 of the welding assembly 200 abuts a part of the annular diaphragm 14 against the end surface of the cylindrical body 11. When the driving mechanism drives the heating head 210 to make a circular motion around the axis of the cylindrical body 11 relative to the filter element 10, the annular diaphragm 14 can be hot-pressed on the end surface of the cylindrical body 11 in a circle and form a plurality of folded portions 15 with multiple layers of annular diaphragms 14 stacked, thereby realizing automatic welding of the filter membrane 13 on the end surface of the cylindrical body 11, with high assembly efficiency, and the formed folded portion 15 is of stable quality and not prone to leakage.

[0032] See also Figure 3 , Figure 4 and Figure 5In some embodiments of the utility model, the base 100 is rotatably provided with a first rotating roller 310 and a second rotating roller 320 which are arranged parallel to each other and spaced apart. The base 100 is movably lifted and lowered with a lower pressing roller 400 located above the first rotating roller 310 and the second rotating roller 320. The lower pressing roller 400, the first rotating roller 310 and the second rotating roller 320 can simultaneously contact the outer peripheral wall of the filter element 10 to jointly define the welding station. The driving mechanism drives at least one of the lower pressing roller 400, the first rotating roller 310 and the second rotating roller 320 to rotate to drive the filter element 10 to rotate around its axis. It can be understood that the filter element 10 is cylindrical, the filter element 10 is placed on the outer peripheral wall of the first rotating roller 310 and the second rotating roller 320, and the lower pressing roller 400 is pressed downward against the outer peripheral wall of the upper side of the filter element 10, and the friction force is used to drive the filter element 10 to rotate. The structure is simple, and there is no need to accurately locate the axial direction of the filter element 10, which is very convenient to use. Moreover, this transmission method can be applied to filter elements 10 of different diameters, has a wider application range, and can be directly used when dealing with filter elements 10 of different diameters.

[0033] See also Figure 5 In some embodiments of the utility model, the first rotating roller 310 is rotatably arranged on the machine base 100 through the first rotating shaft 313, and the second rotating roller 320 is rotatably arranged on the machine base 100 through the second rotating shaft 322. The driving mechanism includes a first pulley 311 and a second pulley 312 fixedly arranged at both ends of the first rotating shaft 313, the first pulley 311 is connected to the first motor 500 through a first belt, and a third pulley 321 is fixedly arranged at one end of the second rotating shaft 322 close to the second pulley 312, and the third pulley 321 is connected to the second pulley 312 through a second belt. The lower pressure roller 400 is rotatably arranged on the lifting seat 420, and the lifting seat 420 is connected to a lifting driver 410 that drives it to move up and down. Specifically, when the first motor 500 rotates, the first belt drives the first rotating shaft 313 on the first pulley 311 to rotate, and the second pulley 312 on the first rotating shaft 313 drives the second rotating shaft 322 on the third pulley 321 to rotate through the second belt, thereby realizing the same-direction rotation of the first rotating roller 310 and the second rotating roller 320, and the lower pressure roller 400 abuts against the outer peripheral wall of the upper side of the filter element 10 when the lifting seat 420 descends, and the lower pressure roller 400 can roll relative to the filter element 10, thereby preventing the filter element 10 from slipping. When another filter element 10 needs to be replaced for end face welding, the lifting driver 410 drives the lower pressure roller 400 to move upward, and the worker or the manipulator can take out the filter element 10 that has completed end face welding.

[0034] See also Figure 3 and Figure 4In some embodiments of the utility model, a movable seat 640 is provided on the base 100, and the welding assembly 200 is installed on the movable seat 640. The movable seat 640 is connected to an adjustment mechanism 600 that drives it to move left and right and forward and backward relative to the base 100 so that the heating head 210 is aligned with a part of the end face of the cylindrical body 11. The movable seat 640 is provided with a positioning mechanism 700 located on one side of the welding assembly 200, and the positioning mechanism 700 is used to limit the position of the end face of the filter element 10. It can be understood that when the specifications of the filter element 10 to be processed change, for example, the diameter of the filter element 10 increases or decreases, the position of the heating head 210 can be adjusted accordingly by using the adjustment mechanism 600 to ensure that the annular diaphragms 14 at both ends of the filter membrane 13 can be welded in place.

[0035] See also Figure 4 It is understandable that the filter element 10 placed at the welding station needs to be positioned in the front-to-back direction to ensure that the annular diaphragm 14 can completely cover the end surface of the cylindrical body 11. In some embodiments of the utility model, the positioning mechanism 700 includes a rod 710 arranged parallel to the cylindrical body 11, one end of the rod 710 is connected to a linear driver 720 for driving its telescopic movement, and the other end of the rod 710 is connected to a positioning block 730 for contacting the end surface of the cylindrical body 11, and the positioning block 730 is connected to a positioning pin 740 that can abut against the inner circumferential wall of the cylindrical body 11, and the positioning block 730 can rotate around the axial direction of the rod 710 to make the positioning pin 740 swing up and down. Among them, when the specifications of the filter element 10 change, the positioning block 730 can be rotated around the axial direction of the rod 710 to make the positioning pin 740 swing to abut against the inner circumferential wall of the cylindrical body 11 to achieve accurate positioning of the filter element 10.

[0036] See also Figure 3 and Figure 4 In some embodiments of the present invention, the adjustment mechanism 600 includes a first screw assembly 610 arranged in the left-right direction and a second screw assembly 620 arranged in the front-back direction, the first screw assembly 610 is connected to a sliding seat 630 that can move left-right relative to the machine base 100, and the movable seat 640 is connected to the second screw assembly 620 to move forward and backward relative to the sliding seat 630. The adjustment mechanism 600 of the above structure has high motion accuracy and a large adjustment range.

[0037] See also Figure 6In some embodiments of the utility model, the heating head 210 is rotatably disposed on the movable seat 640 via a rotary driver 800. The heating head 210 is provided with a truncated cone outer peripheral surface 220 at one end facing the filter element 10. The truncated cone outer peripheral surface 220 is circumferentially arranged around the rotation axis of the heating head 210. The larger end of the truncated cone outer peripheral surface 220 is closer to the axis of the filter element 10 than the smaller end of the truncated cone outer peripheral surface 220. The truncated cone outer peripheral surface 220 can abut against the end edge of the annular diaphragm 14 to guide the annular diaphragm 14 to fold toward the inner circumference of the cylindrical body 11. When Figure 6 When the heating head 210 shown moves close to the center of the cylindrical body 11, the heating head 210 only contacts part of the annular diaphragm 14 at any moment, and then the heating head 210 moves in a circle around the axis of the cylindrical body 11 relative to the filter element 10 before the entire annular diaphragm 14 can be hot-pressed onto the end surface of the cylindrical body 11. Therefore, the part of the annular diaphragm 14 that is not in contact with the heating head 210 may be folded outward along the radial direction of the cylindrical body 11, resulting in failure to completely cover the end surface of the cylindrical body 11. The cover is on the end face of the cylindrical body 11, and the setting of the above-mentioned truncated cone circumferential surface can solve this problem, and can guide the part of the annular diaphragm 14 that is not in contact with the heating head 210 to bend in the radial inward direction of the cylindrical body 11, thereby facilitating the flat portion of the heating head 210 located at the smaller end of the truncated cone outer circumferential surface 220 to hot-press the entire annular diaphragm 14 onto the end face of the cylindrical body 11, and form a plurality of folded portions 15 with stable shapes formed by overlapping multiple layers of annular diaphragms 14.

[0038] See also Figure 6 In some embodiments of the utility model, in order to increase the friction between the truncated cone outer surface 220 and the annular diaphragm 14 so that the annular diaphragm 14 can be smoothly bent in the radial inward direction of the cylindrical body 11 to prevent slipping, a plurality of groove portions 230 are circumferentially distributed on the truncated cone outer surface 220 at intervals around the rotation axis of the heating head 210, and the groove portions 230 are in the shape of long strips and extend along the generatrix direction of the truncated cone outer surface 220.

[0039] See also Figure 3 and Figure 4In some embodiments of the utility model, the rotary driver 800 includes a second motor 810 and a drive sleeve 820 driven by the second motor 810, one end of the drive sleeve 820 is provided with a conductive slip ring 830, the heating head 210 is connected to the other end of the drive sleeve 820 through a sleeve member 840, and the wires between the conductive slip ring 830 and the heating head 210 are passed through the sleeve member 840 and the driving sleeve 820. It can be understood that the heating element inside the heating head 210 needs to be powered to achieve continuous heating, so the external power supply is connected to the conductive slip ring 830, and the conductive slip ring 830 is connected with a wire for powering the heating head 210, and the wire passes through the sleeve member 840 and the driving sleeve 820, so that the heating head 210 can also keep heating during the rotation process.

[0040] See also Figure 3 In some embodiments of the utility model, in order to simultaneously hot-press and fix the annular diaphragms 14 at both ends of the filter membrane 13 on the end faces of the corresponding cylindrical body 11 to improve the production and assembly efficiency, two welding assemblies 200 are provided, and the two welding assemblies 200 are respectively located on the left and right sides of the welding station so that the two heating heads 210 can act on the two ends of the filter element 10 at the same time.

[0041] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0042] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate 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 claims and their equivalents.

Claims

1. A filter element end surface coating device, the filter element (10) comprising a cylindrical body (11) and a filter membrane (13) wrapped around the outside of the cylindrical body (11), both ends of the filter membrane (13) having annular membrane sheets (14) extending from the ends of the cylindrical body (11), characterized in that: include: A machine base (100), wherein the machine base (100) is provided with a welding station for placing the filter element (10); A welding assembly (200) is movably arranged on the machine base (100), and the welding assembly (200) has a heating head (210) for abutting a portion of the annular diaphragm (14) against the end surface of the cylindrical body (11); The driving mechanism is capable of driving the heating head (210) to perform circular motion relative to the filter element (10) around the axis of the cylindrical body (11), so as to heat-press the entire annular diaphragm (14) onto the end surface of the cylindrical body (11) and form a plurality of folded portions (15) with a multi-layer structure.

2. A filter element end surface coating device according to claim 1, characterized in that: The machine base (100) is rotatably provided with a first rotating roller (310) and a second rotating roller (320) which are parallel to each other and spaced apart. The machine base (100) is movably raised and lowered with a lower pressure roller (400) located above the first rotating roller (310) and the second rotating roller (320). The lower pressure roller (400), the first rotating roller (310) and the second rotating roller (320) can simultaneously contact the outer peripheral wall of the filter element (10) to jointly define the welding station. The driving mechanism drives at least one of the lower pressure roller (400), the first rotating roller (310) and the second rotating roller (320) to rotate so as to drive the filter element (10) to rotate around its axis.

3. A filter element end surface coating device according to claim 2, characterized in that: The first rotating roller (310) is rotatably arranged on the machine base (100) via a first rotating shaft (313), and the second rotating roller (320) is rotatably arranged on the machine base (100) via a second rotating shaft (322). The driving mechanism comprises a first pulley (311) and a second pulley (312) fixedly arranged at two ends of the first rotating shaft (313), the first pulley (311) being connected to a first motor (500) via a first belt, a third pulley (321) being fixedly arranged at one end of the second rotating shaft (322) close to the second pulley (312), and the third pulley (321) being connected to the second pulley (312) via a second belt, and the lower pressure roller (400) is rotatably arranged on a lifting seat (420), and the lifting seat (420) is connected to a lifting driver (410) for driving it to move up and down.

4. A filter element end surface coating device according to claim 1, characterized in that: The machine base (100) is provided with a movable seat (640), and the welding assembly (200) is installed on the movable seat (640). The movable seat (640) is connected to an adjustment mechanism (600) for driving it to move left and right and forward and backward relative to the machine base (100) so that the heating head (210) is aligned with a part of the end surface of the cylindrical body (11). The movable seat (640) is provided with a positioning mechanism (700) located on one side of the welding assembly (200), and the positioning mechanism (700) is used to limit the position of the end surface of the filter element (10).

5. A filter element end surface coating device according to claim 4, characterized in that: The positioning mechanism (700) comprises a rod (710) arranged parallel to the cylindrical body (11); one end of the rod (710) is connected to a linear driver (720) for driving its telescopic movement; the other end of the rod (710) is connected to a positioning block (730) for contacting the end surface of the cylindrical body (11); the positioning block (730) is connected to a positioning needle (740) capable of abutting against the inner circumferential wall of the cylindrical body (11); the positioning block (730) can rotate around the axial direction of the rod (710) to allow the positioning needle (740) to swing up and down for adjustment.

6. A filter element end surface coating device according to claim 4, characterized in that: The adjusting mechanism (600) comprises a first screw assembly (610) arranged in the left-right direction and a second screw assembly (620) arranged in the front-back direction, wherein the first screw assembly (610) is connected to a sliding seat (630) which can move left and right relative to the machine base (100), and the movable seat (640) is connected to the second screw assembly (620) so as to move forward and backward relative to the sliding seat (630).

7. A filter element end surface coating device according to claim 4, characterized in that: The heating head (210) is rotatably disposed on the movable seat (640) via a rotary driver (800); a conical outer peripheral surface (220) is disposed at one end of the heating head (210) facing the filter element (10); the conical outer peripheral surface (220) is circumferentially arranged around the rotation axis of the heating head (210); the larger end of the conical outer peripheral surface (220) is closer to the axis of the filter element (10) than the smaller end of the conical outer peripheral surface (220); the conical outer peripheral surface (220) can abut against the end edge of the annular diaphragm (14) to guide the annular diaphragm (14) to fold toward the inner circumference of the cylindrical body (11).

8. A filter element end surface coating device according to claim 7, characterized in that: A plurality of groove portions (230) are circumferentially distributed at intervals on the circumferential surface (220) of the truncated cone around the rotation axis of the heating head (210), and the groove portions (230) are in the shape of elongated strips and extend along the generatrix direction of the truncated cone circumferential surface (220).

9. A filter element end surface coating device according to claim 7, characterized in that: The rotary driver (800) comprises a second motor (810) and a drive sleeve (820) driven by the second motor (810); a conductive slip ring (830) is provided at one end of the drive sleeve (820); the heating head (210) is connected to the other end of the drive sleeve (820) via a sleeve member (840); and the wires between the conductive slip ring (830) and the heating head (210) are passed through the sleeve member (840) and the drive sleeve (820).

10. A filter element end surface coating device according to claim 1, characterized in that: Two welding assemblies (200) are provided, and the two welding assemblies (200) are respectively located on the left and right sides of the welding station, so that the two heating heads (210) act on the two ends of the filter element (10) at the same time.

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