Hydrocarbon refrigerant filling equipment

Abstract

The invention discloses hydrocarbon refrigerant filling equipment, and belongs to the field of liquefied gas filling. The hydrocarbon refrigerant filling equipment comprises a frame body, a filling mechanism, a positioning mechanism and a clamping mechanism, wherein the filling mechanism, the positioning mechanism and the clamping mechanism are arranged in the frame body; three groups of clamping mechanisms which are uniformly distributed along the circumferential direction are arranged in the frame body; the clamping mechanism comprises a rail fixed in the frame body and three groups of limiting parts longitudinally sliding in the rail; the limiting part comprises a sliding frame longitudinally sliding in the rail and an abutting rod sliding in the sliding frame in the horizontal direction. The sliding frame at the lowermost end is fixedly connected with the track; the middle sliding frame is rotationally connected with a synchronous gear; rotating shafts of the synchronous gears are arranged in the horizontal direction; synchronous racks meshed with the synchronous gears are fixedly connected to the sliding frames at the lowermost end and the uppermost end correspondingly. When facing gas cylinders of different sizes and models, the limiting parts directly face the upper position, the middle position and the lower position of the outer wall of the gas cylinder in sequence, and the gas cylinder can be stably clamped in the frame body.

Description

Technical Field

[0001] The invention belongs to the field of liquefied gas filling, and more specifically, relates to a hydrocarbon refrigerant filling device. Background Art

[0002] Hydrocarbon refrigerant filling equipment is used to fill liquefied gas into gas cylinders for transportation and storage. The diameter and height of gas cylinders vary from batch to batch. In order to fill the gas cylinders, they need to be clamped and fixed first to prevent them from shaking during the filling process. In today's equipment, the height of the clamping plate in the clamping mechanism is fixed. When clamping a gas cylinder with a lower height, the upper end of the clamping plate will be located above the gas cylinder. During filling, the filling mechanism is prone to collide with the clamping plate, which will affect the filling effect. When clamping a gas cylinder with a higher height, if the clamping plate is clamped below the center of gravity of the gas cylinder, it will cause unstable clamping and the gas cylinder will easily shake, causing the gas cylinder to tip over. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a hydrocarbon refrigerant filling device, which can stably clamp gas cylinders of different sizes and models.

[0004] A hydrocarbon refrigerant filling device of the present invention comprises a frame and a filling mechanism, a positioning mechanism and a clamping mechanism arranged in the frame; three groups of the clamping mechanisms evenly distributed along the circumferential direction are arranged in the frame; the clamping mechanism comprises a track fixed in the frame and three groups of limiting parts that slide longitudinally in the track; the limiting part comprises a sliding frame that slides longitudinally in the track and a support rod that slides horizontally in the sliding frame; the sliding frame at the lower end is fixedly connected to the track; a synchronous gear is rotatably connected to the middle sliding frame; the rotating shaft of the synchronous gear is arranged in the horizontal direction; the sliding frames at the lower end and the upper end are respectively fixedly connected with synchronous racks that mesh with the synchronous gear.

[0005] As a further improvement of the present invention, one end of the support rod close to the middle of the frame is rotatably connected to a roller; the rotating shaft of the roller is vertically arranged.

[0006] As a further improvement of the present invention, the limiting portion further comprises a feed screw rotatably connected to the sliding frame to drive the abutment rod to slide; the clamping mechanism further comprises a driving mechanism for driving each feed screw to rotate.

[0007] As a further improvement of the present invention, a feed gear is coaxially arranged at one end of the feed screw in the middle limiting portion; the driving mechanism includes an active gear ring, a first frame, an inner gear ring, and a second frame coaxially arranged with the feed gear; the first frame is eccentrically connected to a first gear that is respectively meshed with the inner ring of the active gear ring and the outer ring of the inner gear ring; an eccentric position of the second frame is provided with a second gear that is respectively meshed with the inner ring of the inner gear ring and the feed gear; the first frame is transmission connected to the uppermost feed screw; the second frame is transmission connected to the lowermost feed screw.

[0008] As a further improvement of the present invention, the first frame is connected to the uppermost feed screw by a first synchronous belt transmission; the second frame is connected to the lowermost feed screw by a second synchronous belt transmission; a first tensioner is provided on the first synchronous belt; and a second tensioner is provided on the second synchronous belt.

[0009] As a further improvement of the present invention, a synchronization frame is arranged inside the frame body; the synchronization frame is fixedly connected to the middle sliding frame in each clamping mechanism; the synchronization frame is fixedly connected to a driving motor; the output shaft of the driving motor is fixedly connected to a motor gear; the motor gear is meshed with the outer ring of an active gear ring; a universal transmission shaft is arranged at the lower end of the synchronization frame; the universal transmission shaft enables transmission connection of the active gear rings in the three clamping mechanisms.

[0010] As a further improvement of the present invention, a lifting screw is rotatably connected to the frame body to drive the middle limiting part to move up and down; the positioning mechanism includes a turntable rotatably connected to the bottom of the frame body and a positioning plate longitudinally slidably connected to the turntable; a base for placing the gas cylinder is provided at the upper end of the turntable; an inverted cone-shaped centering bevel is provided on the positioning plate; the centering bevel is coaxially arranged with the turntable.

[0011] As a further improvement of the present invention, a fixing stud coaxially arranged with the turntable is fixedly connected in the frame body; the positioning plate and the fixing stud are connected through threaded transmission.

[0012] As a further improvement of the present invention, a switching motor is fixedly connected in the frame body; a switching gear is arranged on the output shaft of the switching motor; the positioning mechanism also includes a switching column which slides longitudinally on the turntable and is used to drive the switching gear to slide axially; when no gas cylinder is placed on the base, the switching gear is transmission connected to the lifting screw; when a gas cylinder is placed on the base, the switching gear is transmission connected to the turntable.

[0013] As a further improvement of the present invention, a turntable gear is coaxially arranged on the outer periphery of the turntable; a lifting gear is coaxially arranged on the lower end of the lifting screw; a reset spring is arranged between the switching column and the frame; and a switching frame which is plugged into the switching gear is fixedly connected to the switching column.

[0014] Compared with the prior art, the beneficial effect of the present invention is that: due to the undulating contour of the outer wall of the gas cylinder, when each roller abuts against the outer wall of the gas cylinder, the distances of movement of each push rod are different. This solution sets a driving mechanism so that although the movement distances of each push rod are different, through the rotation of the active gear ring, each roller will eventually move to abut against the outer wall of the gas cylinder and generate a certain extrusion force.

[0015] This solution arranges three groups of limiting parts in the clamping mechanism and changes the position of each limiting part by a lifting screw, so that when facing gas cylinders of different sizes and models, each limiting part is opposite to the upper, middle and lower positions of the outer wall of the gas cylinder in turn, so that the gas cylinder can be stably clamped in the frame body, and at the same time, there are no redundant parts covering the top of the gas cylinder, which will not hinder the operation of the filling mechanism.

[0016] This solution sets a positioning plate so that the centering bevel moves upward and cooperates with the lower end surface of the gas cylinder. Then, the gas cylinder placed randomly on the base by the worker will move to a position coaxial with the turntable under the action of the centering bevel, which is convenient for each roller to support the gas cylinder. In addition, the rotation of the turntable can change the direction of the gas cylinder, so that the air inlet valve in the gas cylinder placed randomly on the base will rotate to face the filling mechanism, which is convenient for the filling mechanism to work. At the same time, the turntable can also cooperate with the positioning plate and the fixing stud to drive the centering bevel to move up and down. No additional power element is required to drive the centering bevel to move, saving costs.

[0017] This solution changes the position of the switching gear so that the switching motor can drive the rotating disk and the lifting screw to rotate, thereby adjusting the position of each limit part. And by setting a switching column, when there is no gas cylinder on the base, the switching motor drives the lifting screw to work, and when there is a gas cylinder on the base, the switching motor drives the rotating disk to rotate. Two different functions are realized by one switching motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention;

[0019] Figure 2 It is a structural schematic diagram of the clamping mechanism of the present invention;

[0020] Figure 3 It is a schematic diagram of the exploded structure of the clamping mechanism of the present invention;

[0021] Figure 4 It is a structural schematic diagram of the lifting screw of the present invention driving the limiting part to move;

[0022] Figure 5 It is a structural schematic diagram of the driving mechanism of the present invention from a first viewing angle;

[0023] Figure 6 It is a structural schematic diagram of the driving mechanism of the present invention from a second viewing angle;

[0024] Figure 7 It is a structural schematic diagram of the positioning mechanism of the present invention;

[0025] Figure 8 It is a schematic cross-sectional structural diagram of the positioning mechanism of the present invention.

[0026] Description of the numbers in the figure:

[0027] 1. Frame; 11. Filling mechanism; 12. Cylinder; 13. Take-out port; 2. Clamping mechanism; 21. Track; 22. Synchronous rack; 23. Synchronous gear; 3. Positioning mechanism; 31. Turntable; 311. Base; 312. Turntable gear; 32. Positioning plate; 321. Centering bevel; 33. Fixing stud; 34. Switching column; 341. Switching frame; 4. Limiting part; 41. Sliding frame; 42. Abutment rod; 43. Roller; 44. Feed screw; 45. Feed gear; 5. Driving mechanism; 51. Active gear ring; 52. First frame; 53. First gear; 54. Internal gear ring; 55. Second frame; 56. Second gear; 57. Second synchronous belt; 571. Second tensioner; 58. First synchronous belt; 581. First tensioner; 61. Synchronous frame; 62. Driving motor; 63. Motor gear; 64. Lifting frame; 65. Lifting screw; 651. Lifting gear; 7. Switching motor; 71. Switching gear. DETAILED DESCRIPTION

[0028] Specific embodiment 1: Please refer to Figure 1-Figure 8 A hydrocarbon refrigerant filling device comprises a frame 1 and a filling mechanism 11, a positioning mechanism 3 and a clamping mechanism 2 arranged in the frame 1; three groups of the clamping mechanisms 2 uniformly distributed along the circumferential direction are arranged in the frame 1; the clamping mechanism 2 comprises a track 21 fixed in the frame 1, and three groups of limiting parts 4 longitudinally sliding in the track 21; the limiting part 4 comprises a sliding frame 41 longitudinally sliding in the track 21, and a stopper 42 sliding in the sliding frame 41 in the horizontal direction; the sliding frame 41 at the lower end is fixedly connected to the track 21; the middle sliding frame 41 is rotatably connected with a synchronous gear 23; the rotating shaft of the synchronous gear 23 is arranged in the horizontal direction; the sliding frames 41 at the lower end and the upper end are respectively fixedly connected with synchronous racks 22 meshing with the synchronous gear 23.

[0029] The middle sliding frame 41 is spaced equally from the lower and upper sliding frames 41; when the heights of the gas cylinder 12 are different, the position of the upper sliding frame 41 is changed so that the upper sliding frame 41 faces the upper part of the side wall of the gas cylinder 12, the middle sliding frame 41 faces the middle part of the side wall of the gas cylinder 12, and the lower sliding frame 41 faces the lower part of the side wall of the gas cylinder 12. The different heights of the limiter 4 against the gas cylinder 12 ensure the stability of the gas cylinder 12 and prevent it from tipping over.

[0030] The end of the support rod 42 close to the middle of the frame 1 is rotatably connected to a roller 43; the rotating shaft of the roller 43 is vertically arranged. The roller 43 is used to reduce the friction between the gas cylinder 12 and the limiting part 4 when the gas cylinder 12 rotates circumferentially.

[0031] The limiting portion 4 further includes a feed screw 44 rotatably connected to a driving rod 42 in the sliding frame 41 for sliding; the clamping mechanism 2 further includes a driving mechanism 5 for driving each feed screw 44 to rotate.

[0032] A feed gear 45 is coaxially arranged at one end of the feed screw 44 in the middle limiting part 4; the driving mechanism 5 includes an active gear ring 51, a first frame 52, an inner gear ring 54, and a second frame 55 coaxially arranged with the feed gear 45; the first frame 52 is eccentrically rotatably connected with a first gear 53 which meshes with the inner ring of the active gear ring 51 and the outer ring of the inner gear ring 54 respectively; a second gear 56 which meshes with the inner ring of the inner gear ring 54 and the feed gear 45 respectively is eccentrically arranged on the second frame 55; the first frame 52 is transmission connected to the uppermost feed screw 44; the second frame 55 is transmission connected to the lowermost feed screw 44.

[0033] The first frame 52 is connected to the uppermost feed screw 44 via a first synchronous belt 58; the second frame 55 is connected to the lowermost feed screw 44 via a second synchronous belt 57; a first tensioner 581 is provided on the first synchronous belt 58; and a second tensioner 571 is provided on the second synchronous belt 57.

[0034] By providing the first tensioner 581 and the second tensioner 571 , when the limiting portion 4 moves up and down, the first synchronous belt 58 is always pressed against the first frame 52 and the feed screw 44 , and the second synchronous belt 58 is always pressed against the second frame 55 and the feed screw 44 .

[0035] When the active gear ring 51 rotates forward, the first frame 52, the first gear 53, the inner gear ring 54, the second frame 55, the second gear 56, and the feed gear 45 all rotate forward. During this process, the first gear 53 and the second gear 56 rotate while also orbiting, and through the transmission of the first synchronous belt 58 and the second synchronous belt 57, each feed screw 44 rotates forward, but each feed screw 44 does not necessarily rotate synchronously, and then each roller 43 approaches the gas cylinder 12 at a different speed. As the feed screw 44 rotates forward, the abutment rod 42 gradually approaches the gas cylinder 12 until the roller 43 abuts against the outer wall of the gas cylinder 12.

[0036] As the active gear ring 51 rotates, when a roller 43 abuts against the outer wall of the gas cylinder 12, the roller 43 and the abutting rod 42 cannot move further, and the corresponding feed screw 44 cannot rotate further. For example, if the uppermost roller 43 abuts against the outer wall of the gas cylinder 12 at this time, the corresponding feed screw 44 no longer rotates, and the first frame 52 cannot rotate further. After that, the first gear 53 on the first frame 52 only rotates on its own, and the second frame 55 and the feed gear 45 continue to rotate, and the other two rollers 43 continue to approach the gas cylinder 12. After that, if the middle roller 43 abuts against the gas cylinder 12, and the feed gear 45 cannot rotate further, the second frame 55 continues to rotate until the lowermost roller 43 abuts against the gas cylinder 12, the drive mechanism 5 cannot move further, and the torque of the drive motor 62 increases rapidly. At this time, the drive motor 62 stops working, and each roller 43 abuts against the gas cylinder 12.

[0037] In summary, as long as the active gear ring 51 rotates in the forward direction, no matter how the movement sequence of each limit part 4 changes, each roller 43 will eventually be pressed against the outer wall of the gas cylinder 12, and the gas cylinder 12 will be stably clamped in the frame 1. Similarly, when the active gear ring 51 rotates in the reverse direction, each roller 43 will eventually move to the extreme position away from the gas cylinder 12.

[0038] A synchronous frame 61 is arranged in the frame body 1; the synchronous frame 61 is fixedly connected to the middle sliding frame 41 in each clamping mechanism 2; a driving motor 62 is fixedly connected to the synchronous frame 61; a motor gear 63 is fixedly connected to the output shaft of the driving motor 62; the motor gear 63 is meshed with the outer ring of an active gear ring 51; a universal transmission shaft is arranged at the lower end of the synchronous frame 61; the universal transmission shaft enables the active gear rings 51 in the three clamping mechanisms 2 to be connected in transmission, so that each active gear ring 51 rotates synchronously.

[0039] The frame 1 is rotatably connected to a lifting screw 65 that drives the middle limiting part 4 to move up and down; the positioning mechanism 3 includes a turntable 31 rotatably connected to the bottom of the frame 1 and a positioning plate 32 longitudinally slidably connected to the turntable 31; a base 311 for placing the gas cylinder 12 is provided at the upper end of the turntable 31; an inverted cone-shaped centering bevel 321 is provided on the positioning plate 32; the centering bevel 321 is coaxially arranged with the turntable 31.

[0040] After the gas cylinder 12 is placed on the upper end of the base 311, the gas cylinder 12 is not necessarily coaxial with the turntable 31, which makes it inconvenient to position the gas cylinder 12. By moving the positioning plate 32 upward, the centering slope 321 contacts the lower end surface of the gas cylinder 12, and pushes the gas cylinder 12 to move upward a certain distance relative to the base 311, so that the gas cylinder 12 will slide along the centering slope 321. Finally, under the action of the inverted cone-shaped centering slope 321, the gas cylinder 12 is coaxial with the centering slope 321, and then the gas cylinder 12 is coaxial with the turntable 31. Then the positioning plate 32 moves downward, and the gas cylinder 12 is placed on the upper end of the base 311 again.

[0041] The lifting frame 64 is fixedly connected to the sliding frame 41 in the middle; the lifting screw 65 is transmission-connected to the lifting frame 64 via threads.

[0042] A fixing stud 33 coaxially arranged with the rotating disk 31 is fixedly connected in the frame body 1; the positioning disk 32 is connected to the fixing stud 33 through threaded transmission.

[0043] When the rotating disk 31 rotates, the positioning disk 32 moves up and down through the cooperation between the fixing studs 33 and the positioning disk 32 .

[0044] A switching motor 7 is fixedly connected inside the frame 1; a switching gear 71 is provided on the output shaft of the switching motor 7; the positioning mechanism 3 also includes a switching column 34 which slides longitudinally on the turntable 31 and is used to drive the switching gear 71 to slide axially; when no gas cylinder 12 is placed on the base 311, the switching gear 71 is transmission connected to the lifting screw 65; when a gas cylinder 12 is placed on the base 311, the switching gear 71 is transmission connected to the turntable 31.

[0045] A turntable gear 312 is coaxially arranged on the outer periphery of the turntable 31; a lifting gear 651 is coaxially arranged on the lower end of the lifting screw 65; a return spring is arranged between the switching column 34 and the frame 1; and a switching frame 341 plugged into the switching gear 71 is fixedly connected to the switching column 34.

[0046] The output shaft of the switching motor 7 and the switching gear 71 slide relative to each other in the axial direction and rotate synchronously in the circumferential direction.

[0047] The front side of the frame 1 is provided with a taking-in and putting-out opening 13 for taking-in and putting-out the gas cylinder 12 . There is no clamping mechanism 2 within the range of the taking-in and putting-out opening 13 , so the movement of the gas cylinder 12 is not hindered.

[0048] Before use, there is no gas cylinder 12 placed on the base 311, and the reset spring makes the switching column 34 located at the upper limit position, and the switching frame 341 drives the switching gear 71 to engage with the lifting gear 651. At this time, the size information of the gas cylinder is input into the device, and then the switching motor 7 drives the switching gear 71 to rotate. The switching gear 71 drives the lifting screw 65 to rotate through the lifting gear 651. The lifting screw 65 drives the middle limit part 4 to move up and down through the lifting frame 64. Since the sliding frame 41 at the lower end is fixed, and then through the cooperation of the synchronous gear 23 and the synchronous rack 22, the uppermost limit part 4 moves synchronously, and the distance between the two adjacent limit parts 4 is always equal. Finally, the height of the uppermost limit part 4 is directly opposite to the upper position of the gas cylinder 12.

[0049] Then the worker places the gas cylinder 12 on the base 311 through the access port 13. In this process, the lower end of the gas cylinder 12 abuts against the switching column 34, and drives the switching column to move downward, and then the switching frame 341 makes the switching gear 71 mesh with the turntable gear 312.

[0050] Then the switching motor 7 starts working, and the switching gear 71 drives the turntable 31 to rotate. The turntable 31 drives the positioning plate 32 to rotate synchronously. Under the cooperation of the positioning plate 32 and the fixing stud 33, the positioning plate 32 gradually moves upward. Then the centering inclined surface 321 abuts against the lower end surface of the gas cylinder 12, and forces the gas cylinder 12 to leave the base 311 for a certain distance. During this process, the switching gear 71 is always engaged with the turntable gear 312. Finally, under the action of the centering inclined surface 321, the gas cylinder 12 moves to be coaxial with the turntable 31.

[0051] Then the motor 7 is switched to work in the reverse direction, the positioning plate 32 moves downward, and the gas cylinder 12 is placed back on the upper end of the base 311 .

[0052] In the above process, the driving motor 62 works synchronously, so that the motor gear 63 drives each active gear ring 51 to rotate synchronously in the positive direction. Finally, each roller 43 abuts against the outer wall of the gas cylinder 12, clamping the gas cylinder 12 in the frame 1.

[0053] Then the motor 7 is switched to work, the turntable 31 rotates, and the direction of the air inlet valve on the gas cylinder 12 is changed, so that the air inlet valve on the gas cylinder 12 is opposite to the filling mechanism 11. In this process, the rotation angle of the turntable 31 is less than 360°, and the centering inclined surface 321 will not collide with the gas cylinder 12.

[0054] Then the filling mechanism 11 starts working to fill the gas cylinder 12 .

[0055] After filling is completed, the driving motor 62 drives the active gear ring 51 to rotate in the opposite direction, so that each roller 43 moves to the extreme position away from the gas cylinder 12. Then the worker removes the gas cylinder 12 and places a new gas cylinder 12 on the upper end of the base 311. The above process is repeated to fill the gas cylinders 12 one by one.

Claims

1. A hydrocarbon refrigerant filling device, characterized in that: The invention comprises a frame (1), a filling mechanism (11), a positioning mechanism (3), and a clamping mechanism (2) arranged in the frame (1); three groups of the clamping mechanisms (2) are arranged in the frame (1) and are evenly distributed along the circumferential direction; the clamping mechanism (2) comprises a track (21) fixed in the frame (1), and three groups of limiting parts (4) sliding longitudinally in the track (21); the limiting part (4) comprises a sliding frame (41) sliding longitudinally in the track (21), and a stopper (42) sliding horizontally in the sliding frame (41); the sliding frame (41) at the bottom is fixedly connected to the track (21); a synchronous gear (23) is rotatably connected to the middle sliding frame (41); the rotating shaft of the synchronous gear (23) is arranged in the horizontal direction; and synchronous racks (22) meshing with the synchronous gear (23) are fixedly connected to the sliding frames (41) at the bottom and the top, respectively.

2. The hydrocarbon refrigerant filling equipment according to claim 1, characterized in that: One end of the support rod (42) close to the middle of the frame body (1) is rotatably connected to a roller (43); the rotating shaft of the roller (43) is vertically arranged.

3. The hydrocarbon refrigerant filling equipment according to claim 1, characterized in that: The limiting portion (4) further comprises a feed screw (44) rotatably connected to a driving rod (42) in the sliding frame (41) to slide; the clamping mechanism (2) further comprises a driving mechanism (5) for driving each feed screw (44) to rotate.

4. The hydrocarbon refrigerant filling device according to claim 3 is characterized in that: A feed gear (45) is coaxially arranged at one end of the feed screw (44) in the middle limiting portion (4); the driving mechanism (5) comprises an active gear ring (51) coaxially arranged with the feed gear (45), a first frame (52), an inner gear ring (54), and a second frame (55); the first frame (52) is rotatably connected to a first gear (53) which is respectively meshed with the inner ring of the active gear ring (51) and the outer ring of the inner gear ring (54); the second frame (55) is eccentrically arranged to a second gear (56) which is respectively meshed with the inner ring of the inner gear ring (54) and the feed gear (45); the first frame (52) is transmission-connected to the uppermost feed screw (44); and the second frame (55) is transmission-connected to the lowermost feed screw (44).

5. The hydrocarbon refrigerant filling equipment according to claim 4, characterized in that: The first frame (52) is connected to the uppermost feed screw (44) via a first synchronous belt (58); the second frame (55) is connected to the lowermost feed screw (44) via a second synchronous belt (57); a first tensioner (581) is provided on the first synchronous belt (58); and a second tensioner (571) is provided on the second synchronous belt (57).

6. The hydrocarbon refrigerant filling equipment according to claim 4, characterized in that: A synchronous frame (61) is arranged inside the frame body (1); the synchronous frame (61) is fixedly connected to the middle sliding frame (41) in each clamping mechanism (2); a driving motor (62) is fixedly connected to the synchronous frame (61); a motor gear (63) is fixedly connected to the output shaft of the driving motor (62); the motor gear (63) is meshed with the outer ring of an active gear ring (51); a universal transmission shaft is arranged at the lower end of the synchronous frame (61); the universal transmission shaft enables the active gear rings (51) in the three clamping mechanisms (2) to be transmission-connected.

7. The hydrocarbon refrigerant filling equipment according to claim 1, characterized in that: The frame (1) is rotatably connected to a lifting screw (65) for driving the middle limiting portion (4) to move up and down; the positioning mechanism (3) comprises a turntable (31) rotatably connected to the bottom of the frame (1) and a positioning plate (32) longitudinally slidably connected to the turntable (31); a base (311) for placing a gas cylinder (12) is provided at the upper end of the turntable (31); a centering inclined surface (321) in the shape of an inverted cone is provided on the positioning plate (32); and the centering inclined surface (321) is coaxially arranged with the turntable (31).

8. The hydrocarbon refrigerant filling device according to claim 7, characterized in that: A fixing stud (33) coaxially arranged with the rotating disk (31) is fixedly connected inside the frame body (1); the positioning disk (32) is connected to the fixing stud (33) via threaded transmission.

9. The hydrocarbon refrigerant filling device according to claim 7, characterized in that: A switching motor (7) is fixedly connected inside the frame (1); a switching gear (71) is arranged on the output shaft of the switching motor (7); the positioning mechanism (3) further comprises a switching column (34) which slides longitudinally on the rotating disk (31) and is used to drive the switching gear (71) to slide axially; when no gas cylinder (12) is placed on the base (311), the switching gear (71) is in transmission connection with the lifting screw (65); when a gas cylinder (12) is placed on the base (311), the switching gear (71) is in transmission connection with the rotating disk (31).

10. The hydrocarbon refrigerant filling device according to claim 9, characterized in that: A turntable gear (312) is coaxially arranged on the outer periphery of the turntable (31); a lifting gear (651) is coaxially arranged on the lower end of the lifting screw (65); a return spring is arranged between the switching column (34) and the frame (1); and a switching frame (341) plugged into the switching gear (71) is fixedly connected to the switching column (34).

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