Weighing apparatus with buffering function

Abstract

The utility model discloses a weighing apparatus with a buffer function, which comprises a first part and a second part which are arranged at an interval, the buffer is arranged on the first part and is provided with a piston rod, a damping flow channel is formed between the piston rod of the buffer and the inner wall of a shell of the buffer, and the first end part of the piston rod is in clearance fit contact with the second part; the buffer is arranged in the mode that the first part and / or the second part are / is buffered through the damping effect generated when fluid flows through the damping flow channel, and the resistance generated by the damping effect of the fluid changes along with the change of the force acting on the buffer. The weighing apparatus with the buffer function can greatly reduce the shaking frequency and amplitude of the weighing platform (the first part and / or the second part), buffers the impact force on the weighing platform, protects the structure of the weighing platform, and is not influenced by thermal expansion and cold contraction of the weighing platform.

Description

Technical Field

[0001] The utility model relates to a weighing structure of a weighing instrument, in particular to a weighing instrument with a buffer function. Background Art

[0002] At present, large-scale scales generally use a rigid limit structure with a gap-type impact stop during use. For example, a limit bolt is installed on the stop of a truck scale, and the gap between the limit bolt and the stop is adjusted to limit the longitudinal movement of the truck scale. When a vehicle (or other load) is placed on the scale, the scale platform will shake forward and backward and left and right due to the impact. At this time, the rigid limit structure can prevent the scale platform from shaking too much, causing the scale platform to overturn or misalign with the sensor support.

[0003] However, the existing gap-type limit structure applied to weighing instruments generally has the following problems when it is set on the weighing instrument:

[0004] When a vehicle (or other load) is put on the scale, the scale platform will shake back and forth many times, which will take a long time for the scale platform to stabilize and stop, and the instrument will take a long time to accurately and stably read, affecting the weighing efficiency. At the same time, the back and forth shaking of the scale platform caused by the vehicle on and off the scale will accelerate the wear of the weighing sensor and shorten the service life of the sensor.

[0005] The weighing platform is long in the vertical direction, and the temperature difference in the four seasons will cause the weighing platform to expand and contract. The gap of the traditional gap-type rigid limit structure is easy to get stuck, affecting the weighing accuracy.

[0006] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to a person skilled in the art. Utility Model Content

[0007] The utility model aims to provide a weighing instrument with a buffering function, which can greatly reduce the number and amplitude of the shaking of the weighing platform, buffer the impact force on the weighing platform, and protect the weighing platform structure.

[0008] In order to achieve the above-mentioned object, a specific embodiment of the utility model provides a weighing instrument with a buffering function, comprising:

[0009] The first and second parts are arranged at intervals;

[0010] A buffer disposed on the first part, the buffer having a piston rod and a damping flow channel formed between the piston rod of the buffer and the inner wall of the housing of the buffer, and a first end of the piston rod and the second part maintaining a clearance fit contact;

[0011] Wherein, the buffer is configured to buffer the first part and / or the second part through the damping effect generated by the fluid flowing through the damping channel, and the resistance generated by the damping effect of the fluid varies with the magnitude of the force acting on the buffer.

[0012] In one or more embodiments of the present invention, the piston rod has a second end portion arranged inside the shell of the buffer, and the second end portion is formed with an annular extension portion radially along the piston rod, and a gap is formed between the edge of the annular extension portion and the inner wall of the shell of the buffer, and the gap constitutes the damping flow channel.

[0013] In one or more embodiments of the present invention, the second end of the piston rod divides the interior of the buffer housing into a first space close to the second portion and a second space away from the second portion, and the damping flow channel connects the first space and the second space.

[0014] In one or more embodiments of the present invention, a reflux channel is provided on the rod body of the piston rod located inside the housing of the buffer, and the reflux channel connects the first space and the second space.

[0015] In one or more embodiments of the present invention, the reflow channel is disposed on the annular extension portion of the second end portion, and penetrates the annular extension portion in the thickness direction.

[0016] In one or more embodiments of the present invention, the reflux channel includes a first channel opened on the second end of the piston rod and one or more second channels opened on the piston rod body, the first channel connects the second space and the second channel, and the second channel connects the first channel and the first space.

[0017] In one or more embodiments of the present invention, a one-way valve is provided in the reflux channel, and the one-way valve is configured to only allow the fluid in the buffer to flow from the first space to the second space through the reflux channel.

[0018] In one or more embodiments of the present invention, the first part has two oppositely disposed ends, each of the two ends of the first part is provided with a buffer, and the one-way valves of the two buffers are in opposite directions.

[0019] In one or more embodiments of the present invention, a limit frame is provided on the second part, and an opening is formed on the limit frame; the first end of the piston rod passes through the opening and is arranged in the limit frame, and the first end of the piston rod is formed with an extension portion along the radial direction of the piston rod, and the maximum distance of the extension portion in the radial direction of the piston rod is greater than the size of the opening.

[0020] In one or more embodiments of the present invention, the buffer is a gas damper or a liquid damper.

[0021] In one or more embodiments of the present invention, one of the first part and the second part of the weighing instrument is a weighing platform, and the other of the first part and the second part of the weighing instrument is a weighing platform or a weighing frame or a concrete foundation.

[0022] Compared with the prior art, the weighing instrument with a buffering function according to the utility model, by applying the buffer to the limit of the large weighing instrument platform, adopting the damping effect when the fluid passes through the damping channel and the principle that the size of the resistance generated by the fluid damping effect changes with the size of the external force acting on the buffer and the acceleration, can greatly buffer the impact force on the weighing platform, protect the weighing platform structure, and at the same time not be affected by the thermal expansion and contraction of the weighing platform. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the utility model, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 It is a partially enlarged structural sectional view of a weighing instrument with a buffering function according to one embodiment of the utility model.

[0025] Figure 2 It is an axial cross-sectional view of a buffer in a weighing instrument with a buffer function according to one embodiment of the utility model. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0027] As mentioned in the background technology, the existing rigid limit structure of the gap-type impact stop used in large-scale weighing instruments has problems such as a long time for the weighing platform to reach a stable and stationary state, a long time for the instrument to accurately and stably read, and low weighing efficiency. Based on this, the utility model of the present application provides a weighing instrument with a buffering function, which can greatly reduce the number and amplitude of the weighing platform shaking, buffer the impact force on the weighing platform, protect the weighing platform structure, and is not affected by the thermal expansion and contraction of the weighing platform.

[0028] like Figure 1 to Figure 2 As shown, an embodiment of the utility model provides a weighing instrument 100 with a buffering function, the weighing instrument 100 comprises a first part 130 and a second part 140 which are independent of each other and spaced apart, and a buffer 110 which is arranged between the first part 130 and the second part 140. One of the first part 130 and the second part 140 can be a weighing platform, and the other of the first part 130 and the second part 140 can be a weighing platform or a weighing frame, or a concrete foundation.

[0029] It can be understood that if the first part 130 and the second part 140 are both weighing platforms, the first part 130 and the second part 140 are arranged at intervals in the horizontal direction, and a first limit plate extending longitudinally may be formed on the first part 130 near the second part 140. Similarly, a second limit plate extending longitudinally may be formed on the second part 140 near the first part 130, and the buffer 110 is disposed between the first limit plate and the second limit plate. If the first part 130 is a weighing platform and the second part 140 is a weighing frame, the weighing platform (first part 130) is disposed in the weighing frame (second part 140), a first limit plate 131 extending longitudinally is formed on the first part 130, a limit surface corresponding to the first limit plate 131 is formed on the second part 140, and the buffer 110 is disposed between the first limit plate 131 and the limit surface. If the first part 130 is a weighing platform and the second part 140 is a concrete foundation, then the weighing platform (first part 130) is arranged in the concrete foundation (second part 140), a first limiting plate 131 extending longitudinally is formed on the first part 130, a limiting surface corresponding to the first limiting plate 131 is formed on the second part 140, and the buffer 110 is arranged between the first limiting plate 131 and the limiting surface.

[0030] In one embodiment, the buffer 110 is disposed on the first part 130, and the buffer 110 has a piston rod 111, and the first end A of the piston rod 111 is in clearance fit contact with the second part 140; wherein a damping channel C is formed between the piston rod 111 of the buffer 110 and the inner wall of the housing of the buffer 110. The buffer 110 is configured to form a buffer for the first part and / or the second part acting thereon by the damping effect generated by the fluid flowing through the damping channel C, and the magnitude of the resistance generated by the damping effect of the fluid varies with the magnitude of the force acting on the buffer 110.

[0031] In the above embodiment, the clearance fit contact between the first end A of the piston rod 111 and the second part 140 can be understood as follows: when the scale is in a relatively static state, the first end A of the piston rod 111 and the second part 140 are not in contact with each other, but a certain gap is formed therebetween. However, when relative movement occurs between the second part 140 and the first part 130, the first end A of the piston rod 111 can contact the second part 140.

[0032] In this embodiment, the buffer 110 may include a housing 112, a fluid sealed in the housing 112, and a piston rod 111 disposed in the housing 112 and capable of piston motion relative to the housing 112. The piston rod 111 has a second end B disposed inside the housing of the buffer 110, and a return spring (not shown) may be disposed between the second end B of the piston rod 111 and the housing 112. The second end B is formed with an annular extension B1 along the radial direction of the piston rod 111, and an annular gap is formed between the edge of the annular extension B1 and the inner wall of the housing of the buffer 110, and the annular gap constitutes a damping flow channel C. The width of the damping flow channel C may be set according to actual needs.

[0033] In this embodiment, the second end B of the piston rod 111 and the annular extension B1 divide the interior of the shell of the buffer 110 into a first space close to the second part 140 and a second space away from the second part 140, and the annular gap, i.e., the damping channel C, connects the first space and the second space.

[0034] In order to achieve rapid reflux of the fluid (gas or liquid) in the buffer 110, a reflux channel 1111 is provided on the rod body of the piston rod 111 located inside the shell of the buffer 110, and the reflux channel 1111 connects the first space and the second space. A one-way valve 150 is provided in the reflux channel 1111, and the one-way valve 150 is configured to only allow the fluid (gas or liquid) in the buffer 110 to flow from the first space to the second space through the reflux channel 1111. Since the specific structure of the one-way valve 150 is not the innovative point of the present application, the present application will not elaborate on it in detail here, and any one-way valve on the market that can achieve one-way conduction can be provided in the reflux channel 1111 in the embodiment of the present application.

[0035] Exemplarily, the reflux channel 1111 is disposed on the annular extension portion B1 of the second end portion B of the piston rod 111 and penetrates the annular extension portion B1 in the thickness direction. There may be multiple reflux channels 1111. Each reflux channel 1111 is provided with the aforementioned one-way valve 150.

[0036] In another exemplary embodiment, the reflux channel 1111 includes a first channel 1111a opened on the second end B of the piston rod 111 and one or more second channels 1111b opened on the rod body of the piston rod 111. The first channel 1111a communicates with the second space and the second channel 1111b, and the second channel 1111b communicates with the first channel 1111a and the first space. The one-way valve 150 can be arranged in the first channel 1111a or in each second channel 1111b.

[0037] It is understandable that the number of buffers can be multiple, for example two, respectively arranged at two opposite ends of the first part, and the one-way valves in the two buffers are in opposite directions. This arrangement enables the buffers at both ends of the first part to provide symmetrical back pressure for the first part.

[0038] In this embodiment, the buffer 110 is a buffer with a return spring inside. The return spring is arranged between the second end B of the piston rod 111 located in the shell and the shell. However, when the return spring of the buffer is in a natural state and the scale is in a relatively static state, there is still a gap between the first end A of the piston rod 111 and the second part 140.

[0039] In other embodiments, the buffer 110 may also be a buffer without a return spring inside. In this case, the additional return spring should be mounted on the portion of the piston rod 111 exposed from the shell and supported between the shell of the buffer 110 and the piston rod 111. When the return spring is in a natural state and the scale is in a relatively static state, there is still a certain gap between the first end A of the piston rod 111 and the second part 140.

[0040] The other structures of the buffer 110 can be diverse, but since they are not the points to be protected by the present application, they will not be elaborated in detail herein. Conventional gas dampers or liquid dampers or other types of buffers on the market can be used, as long as the working principle of the buffer 110 is that resistance is generated when the fluid passes through the damping channel and the magnitude of the resistance changes with the magnitude of the external force acting on the buffer and the acceleration, thereby forming the principle of buffering effect.

[0041] In this embodiment, a limit frame 141 is provided on the second part 140, and the limit frame 141 is hollow inside. An opening 142 is formed on the surface of the limit frame 141 opposite to the second part. The first end A of the piston rod 111 passes through the opening 142 and is provided in the limit frame 141. The first end A of the piston rod 111 is formed with an extension A1 along the radial direction of the piston rod 111. The maximum distance of the extension A1 in the radial direction of the piston rod 111 is greater than the size of the opening 142. This design enables, when the distance between the first part 130 and the second part 140 changes under the action of external force or the influence of its own thermal expansion and contraction, the piston rod 111 can move in the limit frame 141 but does not escape from the limit frame 141.

[0042] The scale with buffer function of the present application can be a scale for static use, such as an ordinary platform scale or electronic scale, or a scale for dynamic use, such as a car scale on a highway or a track scale or belt scale on a rail. It is understandable that the scale with buffer function of the present application can set damping channels of different sizes in the buffer and select fluid viscosity or density according to different usage scenarios, such as heavy load low-speed weighing or high-speed weighing.

[0043] It can be understood that the scale with buffer function of the present application resists the shaking of the scale platform by the principle that resistance is generated when the fluid (gas / liquid) passes through the damping flow channel, and the magnitude of the resistance depends on the viscosity and flow rate of the fluid. Moreover, the scale with buffer function of the present application, when the impact of the load is greater, the resistance generated by the buffer is greater, which can quickly attenuate the impact force, buffer the impact force generated when the load is on and off the scale, and protect other mechanical structures of the scale, such as sensors.

[0044] Compared with the prior art, the utility model of the weighing instrument with buffering function, by applying the buffer to the limit of the large weighing instrument platform, adopts the damping effect when the fluid passes through the damping channel and the principle that the size of the resistance generated by the fluid damping effect changes with the size of the external force acting on the buffer and the acceleration, can greatly buffer the impact force on the weighing platform, protect the weighing platform structure, and at the same time not be affected by the thermal expansion and contraction of the weighing platform.

[0045] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0046] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A weighing instrument with a buffer function, characterized in that: include: The first and second parts are arranged at intervals; A buffer disposed on the first part, the buffer having a piston rod and a damping flow channel formed between the piston rod of the buffer and the inner wall of the housing of the buffer, and a first end of the piston rod and the second part maintaining a clearance fit contact; Wherein, the buffer is configured to buffer the first part and / or the second part through the damping effect generated by the fluid flowing through the damping channel, and the resistance generated by the damping effect of the fluid varies with the magnitude of the force acting on the buffer.

2. The weighing instrument with buffer function according to claim 1, characterized in that: The piston rod has a second end portion arranged inside the housing of the buffer, the second end portion is formed with an annular extension portion radially along the piston rod, a gap is formed between the edge of the annular extension portion and the inner wall of the housing of the buffer, and the gap constitutes the damping flow channel.

3. The weighing instrument with buffer function according to claim 2, characterized in that: The second end of the piston rod divides the interior of the housing of the buffer into a first space close to the second portion and a second space away from the second portion, and the damping flow channel connects the first space and the second space.

4. The weighing instrument with buffer function according to claim 3, characterized in that: A reflux channel is provided on the rod body of the piston rod located inside the housing of the buffer, and the reflux channel communicates the first space with the second space.

5. The weighing instrument with buffer function according to claim 4, characterized in that: The reflux channel is disposed on the annular extension portion of the second end portion and penetrates the annular extension portion in a thickness direction.

6. The weighing instrument with buffer function according to claim 4, characterized in that: The reflux channel includes a first channel opened on the second end of the piston rod and one or more second channels opened on the piston rod body, the first channel connects the second space and the second channel, and the second channel connects the first channel and the first space.

7. The weighing instrument with buffer function according to claim 4, characterized in that: A one-way valve is disposed in the reflux channel, and the one-way valve is configured to only allow the fluid in the buffer to flow from the first space to the second space through the reflux channel.

8. The weighing instrument with buffer function according to claim 7, characterized in that: The first part has two oppositely arranged ends, each of which is provided with a buffer, and the one-way valves of the two buffers are in opposite directions.

9. The weighing instrument with buffer function according to claim 1, characterized in that: A limit frame is provided on the second part, and an opening is formed on the limit frame; The first end of the piston rod passes through the opening and is arranged in the limit frame. The first end of the piston rod is formed with an extension portion along the radial direction of the piston rod. The maximum distance of the extension portion in the radial direction of the piston rod is greater than the size of the opening.

10. The weighing instrument with buffer function according to claim 1, characterized in that: The buffer is a gas damper or a liquid damper; and / or, One of the first part and the second part of the weighing instrument is a weighing platform, and the other of the first part and the second part of the weighing instrument is a weighing platform or a weighing frame or a concrete foundation.

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