Weighing cold fresh cabinet door hinge structure

Abstract

The utility model provides a door hinge structure of a weighing cold fresh cabinet, belongs to the technical field of weighing cold fresh cabinets, and particularly relates to the door hinge structure of the weighing cold fresh cabinet, a buffer piston slowly retreating from a sleeve in the hinge structure can provide buffer acting force when the cabinet door is closed, violent impact on a cabinet body when the cabinet door is closed is avoided, shaking of the cabinet body when the cabinet door is closed is reduced, and the service life of the cabinet body is prolonged. Direct collision between the cabinet door and the cabinet body is prevented by controlling the closing speed of the cabinet door, so that cabinet body vibration caused by collision is effectively avoided, and the accuracy of metering data is further guaranteed; when the cabinet door needs to be closed, the cabinet door only needs to be manually pushed towards the closing direction of the cabinet door slightly by applying a short and small acting force, and after the first cam and the driving spring deviate, the cabinet door can be automatically and slowly closed under the action of the driving spring and the buffer piston, so that the door closing convenience is improved, and cold air leakage is reduced.

Description

Technical Field

[0001] The present application relates to the field of weighing and refrigerating cabinets, and in particular to a weighing and refrigerating cabinet door hinge structure. Background Art

[0002] The weighing cold storage cabinet automatically weighs and settles the items after the customers take them, which can realize unmanned sales. However, the doors of existing weighing cold storage cabinets hit the cabinet body when closing, causing the cabinet body to shake and affect the weighing. In addition, the doors are easily not completely closed, causing cold air leakage. Utility Model Content

[0003] In view of this, the present application provides a weighing cold storage cabinet door hinge structure, which solves the problems in the prior art, ensures the smooth closing of the cabinet door, and reduces the shaking of the cabinet body when the cabinet door is closed.

[0004] The present application provides a weighing cold storage cabinet door hinge structure adopts the following technical solution:

[0005] A weighing cold storage cabinet door hinge structure, comprising:

[0006] The installation shell comprises a mounting plate, a sleeve and a driving shell, wherein the mounting plate is used to be fixed on the door frame, the length direction of the sleeve is perpendicular to the mounting plate, one end of the sleeve is sealed, and the other end of the sleeve is open, and the open end of the sleeve is fixedly connected to the mounting plate, and an opening communicating with the sleeve is provided on the mounting plate, the driving shell is located on one side of the sleeve, and a first channel and a second channel are provided in the driving shell and are spaced apart along the length direction of the sleeve, the length directions of the first channel and the second channel are parallel to each other and perpendicular to the length direction of the sleeve, a driving spring is provided in the first channel, a buffer piston is provided in the second channel at one end close to the sleeve, and the side walls of the buffer piston and the second channel are sealed, a first channel corresponding to the first channel and used for the driving spring to extend into the sleeve is provided on the sleeve, a second channel corresponding to the second channel is provided on the sleeve, a return spring is provided at one end of the second channel away from the rotating shaft, and the return spring is used to apply a force toward the rotating shaft to the buffer piston to drive the buffer piston through the second channel and enter the sleeve, and an air outlet communicating with the second channel is provided on the side wall of the driving shell corresponding to the second channel at one end away from the sleeve;

[0007] A rotating shaft, one end of which is rotatably installed in a sleeve, and the other end of the rotating shaft extends out of the sleeve from one end of the opening for fixed connection with the rotating shaft position of the door, the rotating shaft is provided with a first cam and a second cam distributed along the axial direction of the rotating shaft, the first cam, the second cam and the rotating shaft are coaxially arranged, a line connecting the point farthest from the first cam and the rotating shaft and the axis of the rotating shaft is a first line, a line connecting the point farthest from the second cam and the rotating shaft and the axis of the rotating shaft is a second line, an angle between the first line and the second line is 90°, and the first cam is arranged corresponding to the first channel so that the driving spring applies a force to the outer peripheral surface of the first cam, and the second cam is arranged corresponding to the second channel so that the buffer piston applies a force to the outer peripheral surface of the second cam;

[0008] A turntable, fixedly connected to the rotating shaft, and located on a side of the mounting plate facing away from the sleeve;

[0009] A limit assembly mounted on the mounting plate, the limit assembly being used to limit the movement of the turntable when the point where the first cam and the rotating shaft are farthest from each other contacts the driving spring and the first connecting line is parallel to the length direction of the first channel;

[0010] Wherein, the elastic force of the driving spring is always greater than the elastic force of the return spring.

[0011] Optionally, the limiting assembly includes a positioning bead mounted on a mounting plate and a positioning recessed hole arranged on a turntable, the shell of the positioning bead being fixed on a side of the mounting plate facing away from the turntable, the ball of the positioning bead being exposed on a side of the mounting plate facing the turntable, the positioning recessed hole being located on a side of the turntable facing the mounting plate, and when the point at which the first cam and the rotating shaft are farthest from each other contacts a driving spring and the first connecting line is parallel to the length direction of the first channel, the turntable rotates until the positioning recessed hole and the positioning bead are aligned, and the ball of the positioning bead falls into the positioning recessed hole.

[0012] Optionally, the turntable is semicircular, and the limit assembly also includes a limit rod, which is fixed on the side of the mounting plate facing away from the sleeve. When the point farthest between the first cam and the rotating axis contacts the driving spring and the first connecting line is parallel to the length direction of the first channel, the radial side of the turntable abuts against the limit rod.

[0013] Optionally, the buffer piston is hollow and closed at one end close to the rotating shaft, and open at one end away from the rotating shaft. The end of the return spring close to the rotating shaft extends into the buffer piston and abuts against the closed end of the buffer piston rod.

[0014] Optionally, the inner diameter of the air outlet hole is 3%-6% of the inner diameter of the second channel.

[0015] Optionally, the first cam and the second cam have the same structure, and both the first cam and the second cam are conical, and the large-diameter ends of the first cam and the second cam are coaxially connected to the rotating shaft.

[0016] Optionally, the first cam and the second cam include a first arc segment, a transition segment and a second arc segment, the outer circumferential surface of the first arc segment and the second arc segment is arc-shaped, one end of the transition segment is connected to the first arc segment, and the other end of the transition segment is connected to the second arc segment, the axes of the first arc segment and the second arc segment are parallel to the axis of the rotating shaft, and the outer diameter of the first arc segment is greater than the outer diameter of the second arc segment, the first arc segment and the rotating shaft are coaxially arranged, and the side surface of the transition segment is a plane tangent to the outer circumferential arc surface of the first arc segment and the second arc segment.

[0017] Optionally, the circumferential cross-section of one end of the rotating shaft for connecting to the door is rectangular.

[0018] In summary, this application includes the following beneficial technical effects:

[0019] The buffer piston that slowly withdraws from the sleeve in the hinge structure of the present application can provide a buffering force when the cabinet door is closed, thereby avoiding severe impact of the cabinet door on the cabinet body when the cabinet door is closed, reducing the shaking of the cabinet body when the cabinet door is closed, and preventing direct collision between the cabinet door and the cabinet body by controlling the closing speed of the cabinet door, effectively avoiding cabinet vibration caused by collision, thereby ensuring the accuracy of the measurement data.

[0020] When the cabinet door needs to be closed, it is only necessary to manually apply a short and small force to push the cabinet door slightly in the closing direction. After the first cam and the driving spring deviate, the cabinet door can automatically and slowly close under the action of the driving spring and the buffer piston, thereby improving the convenience of closing the door and reducing cold air leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is a schematic diagram of the overall structure of the hinge structure of this application;

[0023] Figure 2 This is a structural schematic diagram of the overall structure of the hinge structure of this application from another perspective;

[0024] Figure 3 This is a schematic diagram of the internal structure of the hinge structure when the cabinet door is closed in the embodiment of the present application;

[0025] Figure 4 This is a schematic diagram of the internal structure of the hinge structure when the cabinet door is opened 90° in the embodiment of the present application;

[0026] Figure 5 This is a schematic diagram of the structure of the first cam and the second cam of the present application;

[0027] Figure 6 This is a schematic diagram of the structure of the limit assembly for limiting the turntable in this application.

[0028] Explanation of the accompanying drawings: 1. Mounting shell; 11. Mounting plate; 12. Sleeve; 13. Drive shell; 131. First channel; 132. Second channel; 133. Drive spring; 134. Buffer piston; 135. Return spring; 136. Air outlet; 2. Rotating shaft; 21. First cam; 22. Second cam; 23. First circular arc segment; 24. Transition segment; 25. Second circular arc segment; 3. Turntable; 31. Positioning recess; 4. Positioning bead; 5. Limit rod. DETAILED DESCRIPTION

[0029] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0030] The following describes the implementation methods of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the following embodiments and the features in the embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.

[0031] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present application, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0032] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0033] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects described may be practiced without these specific details.

[0034] An embodiment of the present application provides a weighing cold storage cabinet door hinge structure.

[0035] A weighing cold storage cabinet door hinge structure, comprising:

[0036] like Figure 1 , Figure 2 and Figure 3 As shown, the mounting shell 1 includes a mounting plate 11, a sleeve 12 and a drive shell 13, the mounting plate 11 is used to be fixed on the door frame, the length direction of the sleeve 12 is perpendicular to the mounting plate 11, one end of the sleeve 12 is sealed, and the other end of the sleeve 12 is opened, the open end of the sleeve 12 is fixedly connected to the mounting plate 11, the mounting plate 11 is provided with an opening connected to the sleeve 12, the drive shell 13 is located on one side of the sleeve 12, and the drive shell 13 is provided with a first channel 131 and a second channel 132 spaced apart along the length direction of the sleeve 12, the length directions of the first channel 131 and the second channel 132 are parallel to each other and perpendicular to the length direction of the sleeve 12, the first channel 131 is provided with a drive spring 133, and the second channel 1 A buffer piston 134 is provided at one end of the inner shell 32 close to the sleeve 12, and the buffer piston 134 is sealed with the side wall of the second channel 132. The sleeve 12 is provided with a first channel 131 corresponding to the first channel 131 and used for the driving spring 133 to extend into the sleeve 12. The sleeve 12 is provided with a second channel 132 corresponding to the second channel 132. A return spring 135 is provided at one end of the second channel 132 away from the rotating shaft 2. The return spring 135 is used to apply a force toward the rotating shaft 2 to the buffer piston 134 to drive the buffer piston 134 to pass through the second channel 132 and enter the sleeve 12. An air outlet 136 connected with the second channel 132 is provided on the side wall of the drive shell 13 corresponding to the second channel 132 away from the sleeve 12.

[0037] like Figure 3 and Figure 4As shown, the rotating shaft 2 is rotatably installed in the sleeve 12 at one end, and the other end of the rotating shaft 2 extends out of the sleeve 12 from one end of the opening for fixed connection with the rotating shaft position of the door. The rotating shaft 2 is provided with a first cam 21 and a second cam 22 distributed along the axial direction of the rotating shaft 2. The first cam 21, the second cam 22 and the rotating shaft 2 are coaxially arranged. The line connecting the point farthest from the first cam 21 and the rotating shaft 2 and the axis of the rotating shaft 2 is the first line, and the line connecting the point farthest from the second cam 22 and the axis of the rotating shaft 2 is the second line. The angle between the first line and the second line is 90°, and the first cam 21 is arranged corresponding to the first channel 131 so that the driving spring 133 applies a force to the outer peripheral surface of the first cam 21, and the second cam 22 is arranged corresponding to the second channel 132 so that the buffer piston 134 applies a force to the outer peripheral surface of the second cam 22.

[0038] like Figure 4 As shown, when the point on the first cam 21 of the present application that is farthest from the rotating shaft 2 contacts the driving spring 133 and the first connecting line is parallel to the first channel 131, the direction of the applied force of the driving spring 133 is parallel to the first connecting line, and the driving spring 133 cannot apply a torque to the rotating shaft 2 that can rotate the rotating shaft 2. At this time, the second connecting line of the second cam 22 and the length direction of the second channel 132 are 90 degrees, and the far end of the second cam 22 is away from the second channel 132. The buffer piston 134 extends into the sleeve 12 under the action of the reset spring 135; after a short force is artificially applied to the rotating shaft 2, the farthest end of the first cam 21 and the driving spring 133 are offset. The force applied by the driving spring 133 can make the distal end of the first cam 21 move away from the driving first channel 131, so that the first cam 21 continues to rotate, and the second cam 22 begins to contact the buffer piston 134, and the second cam 22 begins to apply a force to the buffer piston 134. The force of the second cam 22 makes the buffer piston 134 move away from the rotating shaft 2 along the second channel 132, and the air outlet 136 at one end of the second channel 132 away from the sleeve 12 forms an air resistance to the movement of the buffer piston 134, so that the buffer piston 134 slowly withdraws from the sleeve 12, preventing the rotating shaft 2 from rotating quickly, and the air outlet 136 slowly deflates air to produce appropriate damping to the rotation of the rotating shaft 2.

[0039] After the hinge structure of the present application is correctly installed on the cold storage cabinet, the buffer piston 134 of the slowly withdrawn sleeve 12 in the hinge structure of the present application can provide a buffering force when the cabinet door is closed, thereby avoiding severe impact on the cabinet body when the cabinet door is closed and reducing the shaking of the cabinet body when the cabinet door is closed. After the rotating shaft 2 is connected to the cabinet door, the door is manually rotated and opened 90°. At this time, the end of the first cam 21 farthest from the axis is opposite to the driving spring 133, and the direction of the force applied by the driving spring 133 is parallel to the first connecting line. The driving spring 133 cannot apply a torque to the rotating shaft 2 that can rotate the rotating shaft 2, so that the cabinet door remains in a stably open state. When the cabinet door needs to be closed, it is only necessary to manually apply a short and small force in the closing direction of the cabinet door to slightly push the cabinet door, drive the rotating shaft 2 to rotate, and deviate the distal end of the first cam 21 and the driving spring 133. The force applied by the driving spring 133 can make the distal end of the first cam 21 continue to move away from the driving first channel 131, so that the first cam 21 continues to rotate, and the second cam 22 begins to contact the buffer piston 134, and then under the action of the buffer piston 134, the cabinet door is slowly and steadily closed. Among them, the hinge structure is correctly installed on the cold storage cabinet in the embodiment of the present application, which means that the installation shell 1 is installed on the left side of the cabinet door frame, ensuring that the length direction of the first channel 131 and the second channel 132 is parallel to the plane of the door frame, and the rotation axis 2 extends downward, and at the same time, the cabinet door's rotation axis and the rotation axis 2 are coaxial, and the side of the cabinet door away from the rotation axis and the axis of the rotation axis are parallel to the second line, and are located on the same side of the axis of the rotation axis. In other embodiments, the connection between the installation shell 1 and the cabinet body, and the connection between the rotation axis and the cabinet door can be other ways, as long as it is ensured that when the cabinet door is closed, such as Figure 2 and Figure 3 As shown, the distal end of the second cam 22 abuts against the buffer piston 134 and the second connecting line is parallel to the second channel 132; when the cabinet door is opened, as shown in FIG. Figure 4 and Figure 6 As shown, the distal end of the first cam 21 is directly opposite to the driving spring 133 and the first connecting line is parallel to the two first channels 131 .

[0040] In the embodiment of the present application, the elastic force of the driving spring 133 is always greater than the elastic force of the return spring 135. Specifically, the driving spring 133 provides the force to rotate the rotating shaft 2 with the cabinet door, and the return spring 135 only needs to provide the force to extend the piston rod into the sleeve 12. Moreover, in the entire rotation path of the first cam 21, the end of the driving spring 133 close to the rotating shaft 2 always abuts against the outer peripheral surface of the first cam 21, ensuring that the force applied by the driving spring 133 can rotate the rotating shaft 2 until the cabinet door is completely closed.

[0041] like Figure 5As shown, in one embodiment, the first cam 21 and the second cam 22 include a first arc segment 23, a transition segment 24 and a second arc segment 25, the outer circumferential surface of the first arc segment 23 and the second arc segment 25 is in an arc shape, one end of the transition segment 24 is connected to the first arc segment 23, and the other end of the transition segment 24 is connected to the second arc segment 25, the axes of the first arc segment 23 and the second arc segment 25 are parallel to the axis of the rotating shaft 2, and the outer diameter of the first arc segment 23 is greater than the outer diameter of the second arc segment 25, the first arc segment 23 and the rotating shaft 2 are coaxially arranged, and the side surface of the transition segment 24 is a plane tangent to the outer circumferential arc surface of the first arc segment 23 and the second arc segment 25.

[0042] The circumferential cross section of one end of the rotating shaft 2 for connecting to the door is rectangular, so that when the rotating shaft 2 and the cabinet door are detachably connected, the connection stability is good, and the relative rotation of the rotating shaft 2 and the cabinet door is reduced.

[0043] like Figure 6 As shown, the hinge structure of the present application also includes:

[0044] A turntable 3 is fixedly connected to the rotating shaft 2, and the turntable 3 is located on a side of the mounting plate 11 facing away from the sleeve 12;

[0045] The limit assembly is mounted on the mounting plate 11, and is used to limit the rotation of the turntable 3 when the point at which the first cam 21 and the rotating shaft 2 are farthest from each other contacts the driving spring 133 and the first connecting line is parallel to the length direction of the first channel 131. The cooperation between the limit assembly and the turntable 3 further stabilizes the rotation of the cabinet door when it is opened, and prevents the cabinet door from rotating randomly and affecting the customer's taking of items.

[0046] The limit assembly includes a positioning bead 4 mounted on the mounting plate 11 and a positioning recess 31 provided on the turntable 3. The housing of the positioning bead 4 is fixed on the side of the mounting plate 11 facing away from the turntable 3. The ball of the positioning bead 4 is exposed on the side of the mounting plate 11 facing the turntable 3. The positioning recess 31 is located on the side of the turntable 3 facing the mounting plate 11. When the point at which the first cam 21 and the rotating shaft 2 are farthest away contacts the driving spring 133 and the first connecting line is parallel to the length direction of the first channel 131, the turntable 3 rotates until the positioning recess 31 and the positioning bead 4 are aligned, and the ball of the positioning bead 4 falls into the positioning recess 31. It should be noted that the positioning bead 4 is also called a ball plunger or a spring plunger, which is a load device composed of a housing, a spring, a ball or a column. The positioning bead 4 is an existing industrial device and will not be described in detail here.

[0047] The turntable 3 is semicircular, and the limit assembly also includes a limit rod 5, which is fixed on the side of the mounting plate 11 facing away from the sleeve 12. When the point at which the first cam 21 and the rotating shaft 2 are farthest from each other contacts the driving spring 133 and the first connecting line is parallel to the length direction of the first channel 131, the radial side of the turntable 3 abuts the limit rod 5. The setting of the limit rod 5 limits the rotation of the cabinet door to 90°, so that when the cabinet door is opened, the far end of the first cam 21 is stably aligned with the driving spring 133, avoiding the cabinet door from rotating more than 90° when opening, and avoiding the need for the customer to rotate the cabinet door at a larger angle when closing the door so that the cabinet door opening angle is less than 90° before the cabinet door can be automatically closed. In the embodiment of the present application, the limit rod 5 is a screw threadedly connected to the mounting plate 11.

[0048] The buffer piston 134 is hollow, and one end of the buffer piston 134 close to the rotating shaft 2 is closed, and the end of the buffer piston 134 away from the rotating shaft 2 is open, and the end of the return spring 135 close to the rotating shaft 2 extends into the buffer piston 134 and abuts against the closed end of the rod of the buffer piston 134. The hollow buffer piston 134 ensures that the return spring 135 is of sufficient length and the contact area between the buffer piston 134 and the second channel 132 is ensured, so that the buffer piston 134 and the second channel 132 have good sealing performance.

[0049] The inner diameter of the vent hole is 3%-6% of the inner diameter of the second channel 132. The air outlet hole 136 has a suitable exhaust speed to provide suitable resistance for closing the cabinet door.

[0050] In the embodiment of the present application, a mounting hole is provided on the mounting plate 11 to facilitate the installation of the mounting plate 11 .

[0051] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A weighing cold cabinet door hinge structure, characterized in that: include: The mounting shell (1) comprises a mounting plate (11), a sleeve (12) and a drive shell (13); the mounting plate (11) is used to be fixed on a door frame; the length direction of the sleeve (12) is perpendicular to the mounting plate (11); one end of the sleeve (12) is sealed, and the other end of the sleeve (12) is open; the open end of the sleeve (12) is fixedly connected to the mounting plate (11); the mounting plate (11) is provided with an opening which is communicated with the sleeve (12); the drive shell (13) is located on one side of the sleeve (12); and the drive shell (13) is provided with a first channel (131) and a second channel (132) which are spaced apart along the length direction of the sleeve (12); the length directions of the first channel (131) and the second channel (132) are parallel to each other and perpendicular to the length direction of the sleeve (12); a drive spring (133) is provided in the first channel (131); and a drive spring (133) is provided in the second channel (132). A buffer piston (134) is provided at one end of the inner sleeve (12), and the buffer piston (134) and the side wall of the second channel (132) are sealed. The sleeve (12) is provided with a first channel (131) corresponding to the first channel (131) and used for the driving spring (133) to extend into the sleeve (12). The sleeve (12) is provided with a second channel (132) corresponding to the second channel (132). A return spring (135) is provided at one end of the second channel (132) away from the rotating shaft (2). The return spring (135) is used to apply a force toward the rotating shaft (2) to the buffer piston (134) so ​​as to drive the buffer piston (134) to pass through the second channel (132) and enter the sleeve (12). An air outlet (136) communicating with the second channel (132) is provided on the side wall of the drive housing (13) corresponding to the second channel (132) and away from the sleeve (12); A rotating shaft (2) is rotatably mounted at one end in a sleeve (12), and the other end of the rotating shaft (2) extends out of the sleeve (12) from one end of the opening, and is used to be fixedly connected to the rotating shaft position of the door. The rotating shaft (2) is provided with a first cam (21) and a second cam (22) distributed along the axial direction of the rotating shaft (2). The first cam (21), the second cam (22) and the rotating shaft (2) are coaxially arranged, and the line connecting the point farthest from the first cam (21) and the rotating shaft (2) and the axis of the rotating shaft (2) is the first connecting line. line, a line connecting the point at which the second cam (22) and the rotating shaft (2) are farthest from each other and the axis of the rotating shaft (2) is a second line, an angle between the first line and the second line is 90°, and the first cam (21) is arranged corresponding to the first channel (131) so that the driving spring (133) applies a force to the outer peripheral surface of the first cam (21), and the second cam (22) is arranged corresponding to the second channel (132) so that the buffer piston (134) applies a force to the outer peripheral surface of the second cam (22); A turntable (3) is fixedly connected to the rotating shaft (2), and the turntable (3) is located on a side of the mounting plate (11) facing away from the sleeve (12); a limit assembly mounted on the mounting plate (11), the limit assembly being used to limit the movement of the rotating disk (3) when the point at which the first cam (21) and the rotating shaft (2) are farthest from each other contacts the driving spring (133) and the first connecting line is parallel to the length direction of the first channel (131); The elastic force of the driving spring (133) is always greater than the elastic force of the return spring (135).

2. The hinge structure of the weighing cold storage cabinet door according to claim 1 is characterized in that: The limiting assembly comprises a positioning bead (4) mounted on the mounting plate (11) and a positioning recessed hole (31) arranged on the turntable (3); the housing of the positioning bead (4) is fixed on the side of the mounting plate (11) facing away from the turntable (3); the ball of the positioning bead (4) is exposed on the side of the mounting plate (11) facing the turntable (3); the positioning recessed hole (31) is located on the side of the turntable (3) facing the mounting plate (11); when the point farthest from the first cam (21) and the rotating shaft (2) contacts the driving spring (133) and the first connecting line is parallel to the length direction of the first channel (131), the turntable (3) rotates until the positioning recessed hole (31) and the positioning bead (4) are aligned, and the ball of the positioning bead (4) falls into the positioning recessed hole (31).

3. The hinge structure of the weighing cold storage cabinet door according to claim 2 is characterized in that: The rotating disk (3) is semicircular in shape, and the limiting assembly further comprises a limiting rod (5), which is fixed on a side of the mounting plate (11) facing away from the sleeve (12). When the point at which the first cam (21) and the rotating shaft (2) are farthest from each other contacts the driving spring (133) and the first connecting line is parallel to the length direction of the first channel (131), the radial side edge of the rotating disk (3) abuts against the limiting rod (5).

4. The hinge structure of the weighing cold storage cabinet door according to claim 1, characterized in that: The buffer piston (134) is hollow, and one end of the buffer piston (134) close to the rotating shaft (2) is closed, and one end of the buffer piston (134) away from the rotating shaft (2) is open, and one end of the return spring (135) close to the rotating shaft (2) extends into the buffer piston (134) and abuts against the closed end of the buffer piston (134) rod.

5. The hinge structure of the weighing cold storage cabinet door according to claim 1, characterized in that: The inner diameter of the air outlet hole (136) is 3%-6% of the inner diameter of the second channel (132).

6. The hinge structure of the weighing cold storage cabinet door according to claim 1, characterized in that: The first cam (21) and the second cam (22) have the same structure, and both the first cam (21) and the second cam (22) are conical, and the large diameter ends of the first cam (21) and the second cam (22) are coaxially connected to the rotating shaft (2).

7. The hinge structure of the weighing cold storage cabinet door according to claim 6, characterized in that: The first cam (21) and the second cam (22) comprise a first arc segment (23), a transition segment (24) and a second arc segment (25); the outer circumferential surfaces of the first arc segment (23) and the second arc segment (25) are in an arc shape; one end of the transition segment (24) is connected to the first arc segment (23); the other end of the transition segment (24) is connected to the second arc segment (25); the axes of the first arc segment (23) and the second arc segment (25) are parallel to the axis of the rotating shaft (2); the outer diameter of the first arc segment (23) is greater than the outer diameter of the second arc segment (25); the first arc segment (23) and the rotating shaft (2) are coaxially arranged; and the side surface of the transition segment (24) is a plane tangent to the outer circumferential arc surfaces of the first arc segment (23) and the second arc segment (25).

8. The hinge structure of the weighing cold storage cabinet door according to claim 1, characterized in that: The circumferential cross-section of one end of the rotating shaft (2) used for connecting to the door is rectangular.

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