A hydrocarbon refrigerant filling equipment

Abstract

The present invention discloses a hydrocarbon refrigerant filling device, which belongs to the field of liquefied gas filling. A hydrocarbon refrigerant filling device includes a frame and a filling mechanism, a positioning mechanism, and a clamping mechanism arranged in the frame; three groups of clamping mechanisms evenly distributed along the circumference are arranged in the frame; the clamping mechanism includes a track fixed in the frame, three groups of limiting parts that slide longitudinally in the track; the limiting parts include 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 bottom end is fixedly connected to the track; the middle sliding frame is rotatably connected to a synchronous gear; the rotating shaft of the synchronous gear is arranged in the horizontal direction; the sliding frames at the bottom and top ends are respectively fixedly connected to a synchronous rack that meshes with the synchronous gear. When facing gas cylinders of different sizes and models, each limiting part is aligned with the upper, middle and lower positions of the outer wall of the gas cylinder in turn, which can stably clamp the gas cylinder in the frame.

Description

Technical Field

[0001] The present invention belongs to the field of liquefied gas filling, and more particularly, 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 supported 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 lower gas cylinder, the upper end of the clamping plate will be located above the gas cylinder. During filling, the filling mechanism is prone to collision with the clamping plate, which will affect the filling effect. When clamping a higher gas cylinder, if the clamping plate is clamped below the center of gravity of the gas cylinder, it will cause unstable support 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 includes a frame and a filling mechanism, a positioning mechanism, and a clamping mechanism arranged in the frame; three groups of clamping mechanisms uniformly distributed along the circumferential direction are arranged in the frame; the clamping mechanism includes a track fixed in the frame and three groups of limiting parts that slide longitudinally in the track; the limiting part includes 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 includes a feed screw rotatably connected to the sliding frame to drive the push rod to slide; the clamping mechanism further includes a driving mechanism that drives 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 part; 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; a second gear is respectively meshed with the inner ring of the inner gear ring and the feed gear at an eccentric position on the second frame; the first frame is transmission-connected to the feed screw at the uppermost end; the second frame is transmission-connected to the feed screw at the lowermost end.

[0008] As a further improvement of the present invention, the first frame is connected to the feed screw at the upper end through a first synchronous belt transmission; the second frame is connected to the feed screw at the lower end through 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 provided in 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 engaged with the outer ring of an active gear ring; a universal transmission shaft is provided at the lower end of the synchronization frame; the universal transmission shaft enables the active gear rings in the three clamping mechanisms to be connected in transmission.

[0010] As a further improvement of the present invention, the frame is rotatably connected to a lifting screw that drives the middle limiting part to move up and down; the positioning mechanism includes a turntable rotatably connected to the bottom of the frame 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 to the frame body; a switching gear is provided on the output shaft of the switching motor; the positioning mechanism also includes a switching column that slides longitudinally on the turntable to drive the switching gear to slide axially; when there is no gas cylinder placed on the base, the switching gear is connected to the lifting screw; when a gas cylinder is placed on the base, the switching gear is 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 that is plugged into the switching gear is fixedly connected to the switching column.

[0014] Compared to the prior art, the present invention has the following advantages: due to the undulating contour of the cylinder's outer wall, the distances each push rod moves vary when each roller contacts the cylinder's outer wall. By providing a drive mechanism, this solution ensures that, despite the varying movement distances of each push rod, the rotation of the active gear ring ultimately ensures that each roller contacts the cylinder's outer wall, generating a certain amount of squeezing force.

[0015] This solution sets three groups of limiting parts in the clamping mechanism and changes the position of each limiting part through a lifting screw. When facing gas cylinders of different sizes and models, each limiting part is aligned with the upper, middle and lower positions of the outer wall of the gas cylinder in turn, which can stably clamp the gas cylinder in the frame. At the same time, there are no unnecessary parts covering the top of the gas cylinder, which will not hinder the operation of the filling mechanism.

[0016] This solution uses a positioning plate to allow the centering bevel to move upward and cooperate with the lower end surface of the gas cylinder. As a result, the gas cylinders placed arbitrarily on the base by the workers will be moved to a position coaxial with the turntable under the action of the centering bevel, making it easier for the rollers to support the gas cylinders. Furthermore, the rotation of the turntable can change the orientation of the gas cylinders, causing the air inlet valves in the gas cylinders placed arbitrarily on the base to rotate to face the filling mechanism, facilitating the operation of the filling mechanism. At the same time, the turntable can also cooperate with the positioning plate and fixed studs to drive the centering bevel up and down, eliminating the need for additional power components to drive the centering bevel movement, thus saving costs.

[0017] This solution changes the position of the switching gear, allowing the switching motor to drive both the turntable and the lifting screw, adjusting the position of each stop. Furthermore, by providing a switching column, the switching motor drives the lifting screw when there is no gas cylinder on the base, and drives the turntable when there is a gas cylinder on the base. This achieves two distinct functions with a single 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 Schematic diagram of the exploded structure of the clamping mechanism of the present invention;

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

[0022] Figure 5 This is a schematic structural diagram of the driving mechanism of the present invention from a first perspective;

[0023] Figure 6 This is a schematic structural 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. Gas cylinder; 13. Access 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. Stop 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 Figures 1-8 A hydrocarbon refrigerant filling device includes 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 clamping mechanisms 2 are evenly distributed in the circumferential direction are arranged in the frame 1; the clamping mechanism 2 includes a rail 21 fixed in the frame 1, three groups of limiting parts 4 sliding longitudinally in the rail 21; the limiting part 4 includes a sliding frame 41 sliding longitudinally in the rail 21, and a push rod 42 sliding horizontally in the sliding frame 41; the lowermost sliding frame 41 is fixedly connected to the rail 21; the middle sliding frame 41 is rotatably connected to a synchronous gear 23; the rotating shaft of the synchronous gear 23 is arranged in the horizontal direction; the lowermost and uppermost sliding frames 41 are respectively fixedly connected to a synchronous rack 22 meshing with the synchronous gear 23.

[0029] The middle sliding frame 41 is spaced equidistant from the lower and upper sliding frames 41, respectively. When the gas cylinders 12 are at different heights, the position of the uppermost sliding frame 41 is adjusted so that the uppermost sliding frame 41 faces the upper portion of the side wall of the gas cylinder 12, the middle sliding frame 41 faces the middle portion of the side wall of the gas cylinder 12, and the lowermost sliding frame 41 faces the lower portion of the side wall of the gas cylinder 12. The different heights of the stoppers 4 abut against the gas cylinder 12, ensuring the stability of the gas cylinder 12 and preventing it from tipping over.

[0030] The end of the support rod 42 near the middle of the frame 1 is rotatably connected to a roller 43; the rotation axis 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 provided 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 provided with the feed gear 45; the first frame 52 is eccentrically connected to a first gear 53 that is respectively meshed with the inner ring of the active gear ring 51 and the outer ring of the inner gear ring 54; a second gear 56 is respectively meshed with the inner ring of the inner gear ring 54 and the feed gear 45 at an eccentric position provided on the second frame 55; the first frame 52 is transmission-connected to the feed screw 44 at the uppermost end; the second frame 55 is transmission-connected to the feed screw 44 at the lowermost end.

[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 driving 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. Furthermore, through the transmission of the first synchronous belt 58 and the second synchronous belt 57, each feed screw 44 rotates forward, but not necessarily synchronously. Consequently, each roller 43 approaches the gas cylinder 12 at a different speed. As the feed screw 44 rotates forward, the abutting 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 driving gear ring 51 rotates, when one roller 43 abuts 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 top roller 43 abuts the outer wall of the gas cylinder 12 at this time, the corresponding feed screw 44 stops rotating, and the first frame 52 cannot rotate further. Thereafter, the first gear 53 on the first frame 52 rotates only on its own, and the second frame 55 and the feed gear 45 continue to rotate, while the other two rollers 43 continue to move toward the gas cylinder 12. If the middle roller 43 then abuts the gas cylinder 12, the feed gear 45 cannot rotate further. The second frame 55 then continues to rotate until the bottom roller 43 abuts the gas cylinder 12, and the drive mechanism 5 cannot move further. The torque of the drive motor 62 increases rapidly, and the drive motor 62 stops working, and each roller 43 abuts the gas cylinder 12.

[0037] In summary, as long as the active gear ring 51 rotates in the forward direction, regardless of the order in which the limiting portions 4 move, each roller 43 will ultimately abut against the outer wall of the gas cylinder 12, stably clamping the gas cylinder 12 in the frame 1. Similarly, if the active gear ring 51 rotates in the reverse direction, each roller 43 will eventually move to a limit position away from the gas cylinder 12.

[0038] A synchronous frame 61 is provided 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 engaged with the outer ring of an active gear ring 51; a universal joint is provided at the lower end of the synchronous frame 61; the universal joint 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 conical 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 top of the base 311, it is not necessarily coaxial with the turntable 31, making it difficult to position the gas cylinder 12. By moving the positioning plate 32 upward, the centering bevel 321 contacts the lower end of the gas cylinder 12, pushing the gas cylinder 12 upward relative to the base 311 a certain distance, causing the gas cylinder 12 to slide along the centering bevel 321. Ultimately, under the action of the inverted tapered centering bevel 321, the gas cylinder 12 becomes coaxial with the centering bevel 321, and thus with the turntable 31. The positioning plate 32 then moves downward, placing the gas cylinder 12 back on the top of the base 311.

[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 turntable 31 is fixedly connected in the frame body 1 ; the positioning plate 32 is connected to the fixing stud 33 via threaded transmission.

[0043] When the turntable 31 rotates, the positioning disc 32 moves up and down due to the cooperation between the fixing studs 33 and the positioning disc 32 .

[0044] A switching motor 7 is fixedly connected to 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 that slides longitudinally on the turntable 31 and is used to drive the switching gear 71 to slide axially; when there is no gas cylinder 12 placed on the base 311, the switching gear 71 is transmission connected to the lifting screw 65; when the 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 provided on the outer periphery of the turntable 31; a lifting gear 651 is coaxially provided on the lower end of the lifting screw 65; a return spring is provided between the switching column 34 and the frame 1; a switching frame 341 is fixedly connected to the switching column 34 and is plugged into the switching gear 71.

[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 take-out opening 13 for taking out and putting in the gas cylinder 12 . There is no clamping mechanism 2 within the range of the take-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. During 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 causes the switching gear 71 to engage with the turntable gear 312.

[0050] The switching motor 7 then activates, and the switching gear 71 drives the turntable 31 to rotate. This in turn drives the positioning disc 32 to rotate synchronously. The positioning disc 32, in conjunction with the fixing studs 33, gradually moves upward. The centering bevel 321 then abuts against the lower end of the gas cylinder 12, forcing the gas cylinder 12 a certain distance away from the base 311. During this process, the switching gear 71 remains engaged with the turntable gear 312. Ultimately, the centering bevel 321 forces the gas cylinder 12 to become 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 replaced on the upper end of the base 311 .

[0052] During the above process, the drive 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 operate, and the turntable 31 rotates to change the direction of the air inlet valve on the gas cylinder 12 so that the air inlet valve on the gas cylinder 12 is opposite to the filling mechanism 11. During this process, the rotation angle of the turntable 31 is less than 360 degrees, and the centering bevel 321 does 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 complete, the drive motor 62 drives the active gear ring 51 to rotate in the opposite direction, causing each roller 43 to move to its limit position away from the gas cylinder 12. The worker then removes the gas cylinder 12 and places a new gas cylinder 12 on the top of the base 311. The above process is repeated, filling the gas cylinders 12 one by one.

Claims

1. A hydrocarbon refrigerant filling device, characterized by: The invention 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), three groups of limiting parts (4) longitudinally sliding in the track (21); the limiting parts (4) comprise a sliding frame (41) longitudinally sliding in the track (21), and a stop rod (42) sliding in the horizontal direction in the sliding frame (41); the sliding frame (41) at the lower end 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; the sliding frames (41) at the lower end and the upper end are respectively fixedly connected to synchronous racks (22) meshing with the synchronous gear (23); One 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 limiting portion (4) further includes a feed screw (44) that is rotatably connected to a driving rod (42) in the sliding frame (41) to slide; the clamping mechanism (2) further includes a driving mechanism (5) that drives each feed screw (44) to rotate; 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) includes 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) that meshes with the inner ring of the active gear ring (51) and the outer ring of the inner gear ring (54) respectively at an eccentric position; a second gear (56) that meshes with the inner ring of the inner gear ring (54) and the feed gear (45) respectively is arranged at an eccentric position on the second frame (55); the first frame (52) is transmission-connected to the feed screw (44) at the uppermost end; the second frame (55) is transmission-connected to the feed screw (44) at the lowermost end; 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); a second tensioner (571) is provided on the second synchronous belt (57); A synchronous frame (61) is provided 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 provided 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; 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 the 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); the centering inclined surface (321) is coaxially arranged with the turntable (31).

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

3. The hydrocarbon refrigerant filling equipment according to claim 1, characterized in that: A switching motor (7) is fixedly connected to the frame (1); a switching gear (71) is provided on the output shaft of the switching motor (7); the positioning mechanism (3) further comprises 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 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 turntable (31).

4. The hydrocarbon refrigerant filling equipment according to claim 3, characterized in that: A turntable gear (312) is coaxially provided on the outer periphery of the turntable (31); a lifting gear (651) is coaxially provided on the lower end of the lifting screw (65); a return spring is provided 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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