Weighing wheel and weighing stretcher

Abstract

The invention discloses a weighing wheel. The weighing wheel comprises a wheel carrier, a wheel shaft type sensor and a roller, the axle type sensor is of an integrated axle structure composed of a left supporting section, a left strain section, a middle supporting section, a right strain section and a right supporting section. The roller is movably sleeved on the middle supporting section through a shaft hole in the roller, and the roller is axially limited on the middle supporting section through an axial limiting piece group; the left supporting section is supported in a first mounting through hole in a left supporting plate of the wheel carrier, the right supporting section is supported in a second mounting through hole in a right supporting plate of the wheel carrier, and a limiting structure for axially limiting and circumferentially limiting the axle type sensor is further arranged. The device is simple and compact in structure, small in occupied space, high in measurement accuracy, convenient to install and capable of being produced in batches and reducing cost. The invention further discloses a weighing stretcher using the weighing wheel. The weighing stretcher has the advantages that the weighing wheel is easy and convenient to install, maintenance and replacement are convenient, and the weighing measurement accuracy is high.

Description

Technical Field

[0001] The invention relates to the field of measurement technology, in particular to a weighing wheel and a weighing stretcher using the weighing wheel. Background Art

[0002] The main purpose of weighing on a weighing stretcher is to facilitate medical staff to determine the first aid plan based on the patient's weight. This is particularly important for medical first aid and rescue operations because it allows medical staff to quickly obtain the patient's weight information, which is crucial for formulating appropriate first aid measures, adjusting drug dosages, and subsequent treatment plans.

[0003] There are usually two types of weighing stretchers currently available on the market: one is to set a pressure sensor on the top of the wheel frame of the roller of the stretcher, such as a weighing stretcher disclosed in the Chinese invention patent with patent number 2023205429802; this type of weighing stretcher requires support legs, and the overall structure takes up a relatively large space. In addition, the support legs, pressure sensors and rollers cannot be integrated into one module, and individual components need to be installed one by one during installation, which is cumbersome to install and has low measurement accuracy. The other is to set a pressure sensor on the frame on the stretcher, such as a smart stretcher disclosed in the Chinese invention patent application with patent number 2020103273237; this type of weighing stretcher is cumbersome to install and debug, and has low measurement accuracy. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a weighing wheel with simple and compact structure, small occupied space and high measuring accuracy, and to provide a weighing stretcher using the weighing wheel.

[0005] In view of the problems that the weighing stretchers seen on the market have complicated installation and debugging and low measurement accuracy, the present application designs a weighing wheel that can be mass-produced and installed on the weighing stretcher only needs to be connected to the weighing stretcher by bolts. The installation and debugging are very convenient, which greatly reduces the cost.

[0006] A weighing wheel described in this scheme includes: a wheel frame, an axle sensor and a roller; the axle sensor is an integrated wheel axle structure composed of a left support section, a left strain section, a middle support section, a right strain section and a right support section; the roller is movably sleeved on the middle support section through an axial hole on the roller, and the roller is axially limited on the middle support section by an axial limit member group; a first mounting through hole is opened on the left support plate of the wheel frame, and the left support section is supported in the first mounting through hole, a second mounting through hole is opened on the right support plate of the wheel frame, and the right support section is supported in the second mounting through hole, and a limiting structure for axially and circumferentially limiting the axle sensor is provided between the left support section and the wheel frame or between the right support section and the wheel frame.

[0007] Further, in the aforementioned weighing wheel, the structure of the axial limit member group is as follows: an axial ring is provided on the circumferential side wall at the left end of the middle support section, and a circle of inwardly concave annular groove is opened on the circumferential side wall at the right end of the middle support section; the axial hole on the roller is a step hole composed of a first axial hole and a second axial hole, the aperture of the first axial hole is larger than the aperture of the second axial hole, and after the roller is inserted from the right end of the wheel axle sensor, the step surface between the first axial hole and the second axial hole abuts against the right side end surface of the axial ring; after the roller and the connecting ring are successively inserted from the right end of the wheel axle sensor, the two semi-annular limit members are assembled at the annular groove, at which time, the inner rings of the two semi-annular limit members are located in the annular groove, and the two semi-annular limit members are fixedly connected to the right end of the connecting ring by a plurality of first screws. The roller is restricted on the middle support section by the axial limiter group. At this time, when the weighing wheel is used, the roller, the left support section and the right support section play a supporting role, and strain occurs in the left strain section and the right strain section.

[0008] After the weighing wheel is assembled, the roller is pushed to the right until it is tightly attached to the connecting ring. At this time, there is a margin between the step surface between the first axial hole and the second axial hole and the right end surface of the shaft ring, and the margin is 2±1mm, that is, after the weighing wheel is assembled, the roller is not completely restricted in the axial direction, but the roller is restricted to the middle support section of the wheel-axle sensor and cannot be separated from the middle support section, and the roller restricted on the middle support section has an axial movement margin of 2±1mm.

[0009] Furthermore, in the aforementioned weighing wheel, the limiting structure is: two grooves with flat bottoms and the bottoms penetrating the circumferential side wall of the right supporting section are symmetrically cut on the circumferential side wall of the right supporting section, the bottoms of the two grooves are parallel to each other, and the U-shaped clamping plate is inserted into the two grooves and fixedly connected to the right end of the right supporting plate by a plurality of second screws, thereby limiting the axial and circumferential positions of the wheel axle sensor, and at this time the wheel axle sensor will neither move axially nor rotate circumferentially.

[0010] This solution also provides an application of a weighing wheel, which is applied to a stretcher to form a weighing stretcher. The number of weighing wheels is selected to be 4, and the wheel frames on each weighing wheel are fixedly installed on the stretcher by a number of bolts; the four weighing wheels can not only support the stretcher, but also roll in contact with the contact surface when the stretcher needs to be pushed, which is convenient for operators to push the stretcher, and can also monitor the weight of the patient on the stretcher or the weight of the infusion liquid on the infusion pole hanging on the stretcher in real time, etc. A display screen with a signal processing module is also provided on the stretcher, and the signal lines of the wheel axle sensors on each weighing wheel are connected to the signal transmission end of the signal processing module, and the four wheel axle sensors transmit the signal to the signal processing module, which processes the signal and displays the final number on the display screen.

[0011] In order to facilitate wiring and the overall aesthetics of the installation, the signal line of the axle sensor is designed to be led out from the end of the right support section; the left support plate of each weighing wheel installed on the stretcher is located on the outside, and the right support plate is located on the inside.

[0012] The beneficial effects of the present invention are: ① the weighing wheel has a simple and compact structure, occupies a small space, has high measurement accuracy, is easy to install, can be mass-produced, and reduces costs; ② the weighing stretcher has the advantages of easy assembly and disassembly of the weighing wheel and high weighing measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the three-dimensional structure of a weighing wheel described in the present invention.

[0014] Figure 2 It is a schematic diagram of the partially enlarged structure of the right part of the axle sensor.

[0015] Figure 3 It is a two-dimensional structural schematic diagram of a weighing wheel described in the present invention.

[0016] Figure 4 yes Figure 3 Schematic diagram of the structure in the AA section direction.

[0017] Figure 5 It is a schematic cross-sectional structural diagram of a weighing wheel according to the present invention.

[0018] Figure 6 It is a three-dimensional structural schematic diagram of a weighing stretcher described in the present invention.

[0019] Figure 7 It is a two-dimensional structural schematic diagram of a weighing stretcher described in the present invention.

[0020] in: 1. Wheel frame; 11. Left support plate; 12. First mounting through hole; 13. Right support plate; 2. Roller; 21. First axial hole; 22. Second axial hole; 23. Step surface; 3. Wheel-axle sensor; 31. Left support section; 32. Left strain section; 33. Middle support section; 34. Right strain section; 35. Right support section; 36. Shaft ring; 37. Annular slot; 38. Slot; 39. Signal line; 4. Connecting ring; 5. Semi-circular stopper; 6. First screw; 7. U-shaped card plate; 8. Second screw; 9. Stretcher; 10. Weighing wheel; DETAILED DESCRIPTION

[0021] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and preferred embodiments. Embodiment 1

[0022] For the convenience of description, this embodiment uses Figure 3 The left-hand direction shown is defined as "left", with Figure 3 The right-hand side direction is defined as "right", and the directional words "left" and "right" involved in this embodiment are based on this definition. It should be noted that the direction defined here is only for the convenience of describing the relative positions of various components, and does not limit the installation direction and installation method of the weighing wheel.

[0023] like Figure 1 , Figure 3 and Figure 5 As shown, a weighing wheel 10 described in this embodiment includes: a wheel frame 1, a wheel axle sensor 3 and a roller 2. The wheel frame 1 is formed by bending a piece of metal plate, and has a space for installing the roller, and a left support plate 11 and a right support plate 13 for supporting the wheel axle sensor 3. The overall structure of the wheel frame 1 is symmetrical with respect to the center line. A plurality of connecting holes are provided on the top plate 14 of the wheel frame 1, and each bolt can be fastened and connected with the equipment to be installed with the weighing wheel through the corresponding connecting holes on the top plate 14. The wheel axle sensor 3 is an integrated wheel axle structure composed of a left support section 31, a left strain section 32, a middle support section 33, a right strain section 34, and a right support section 35. The roller 2 is movably sleeved on the middle support section 33 through the axial hole on the roller 2, and the roller 2 is axially limited on the middle support section 33 by the axial limiter group.

[0024] The axial limiter assembly can be in the form of a shaft shoulder, a shaft ring, a chuck, a pin, etc. Considering the installation space, aesthetics, etc., the axial limiter assembly is designed as follows: Figure 1 , Figure 3 and Figure 5As shown, a collar 36 is provided on the circumferential side wall at the left end of the middle support section 33, and a circle of concave annular groove 37 is provided on the circumferential side wall at the right end of the middle support section 33. The axial hole on the roller 2 is a stepped hole composed of a first axial hole 21 and a second axial hole 22, the aperture of the first axial hole 21 is larger than the aperture of the second axial hole 22, and after the roller 2 is inserted from the right end of the wheel shaft sensor 3, the step surface 23 between the first axial hole 21 and the second axial hole 22 abuts against the right end surface of the collar 36; after the roller 2 and the connecting ring 4 are inserted from the right end of the wheel shaft sensor 3, two semi-annular stoppers 5 are assembled at the annular groove 37, the inner rings of the two semi-annular stoppers 5 are located in the annular groove 37, and the two semi-annular stoppers 5 are fixedly connected to the right end of the connecting ring 4 by a plurality of first screws 6. At this time, the two assembled semi-annular stoppers 5 are assembled into an annular structure, the inner diameter of which is smaller than the diameter of the annular groove 37, so the axial position of the annular structure is limited by the annular groove 37, and the connecting ring 4 is fastened to the annular structure by the first screws 6, so the axial position of the connecting ring 4 is also limited. At this time, the range of motion of the roller 2 is limited in the space between the shaft ring 36 and the connecting ring 4.

[0025] When the assembled weighing wheel 10 is moved to the right, the roller 2 is pressed against the connecting ring 4. At this time, the straight-line distance between the step surface 23 between the first axial hole 21 and the second axial hole 22 and the right end surface of the shaft ring 36 is 2±1mm, that is, 2±1mm of free space is left for the axial movement of the roller 2. The reason for leaving 2±1mm of free space is that if this margin is not left, when the roller 2 is under weight, the roller 2 will contact with both the shaft ring 36 and the connecting ring 4 to generate friction, thereby affecting the measurement accuracy of the wheel-axle sensor 3. When a margin of 2±1mm is left, this part of friction can be avoided as much as possible when the roller is under weight, thereby improving the measurement accuracy of the wheel-axle sensor 3.

[0026] like Figure 1 , Figure 3 and Figure 5 As shown, a first mounting through hole 12 is opened on the left support plate 11 of the wheel frame 1, and the left support section 31 is supported in the first mounting through hole 12. A second mounting through hole is opened on the right support plate 13 of the wheel frame 1, and the right support section 35 is supported in the second mounting through hole. A limiting structure for axially limiting and circumferentially limiting the wheel axle sensor 3 is arranged between the left support section 31 and the wheel frame 1 or between the right support section 35 and the wheel frame 1.

[0027] The limiting structure can be in the form of a shaft shoulder, a shaft ring, a chuck, a pin, etc. Considering the installation space, aesthetics and other factors, the limiting structure is designed as follows: Figure 1 , Figure 2 and Figure 4 As shown, two grooves 38 with a flat bottom and a bottom that penetrates the circumferential side wall of the right support section 35 are symmetrically cut on the circumferential side wall of the right support section 35, and the bottoms of the two grooves 38 are parallel to each other. The U-shaped clamping plate 7 is clamped into the two grooves 38 and is fixedly connected to the right end of the right support plate 13 by a plurality of second screws 8. At this time, the axial and circumferential positions of the right support section 35 are restricted by the cooperation of the two arms of the U-shaped clamping plate 7 and the two grooves 38 and the fixed connection between the U-shaped clamping plate 7 and the right support plate 13, and the wheel axle sensor 3 can neither move axially nor rotate circumferentially.

[0028] When the weighing wheel 10 is used, the left support section 31, the middle support section 33, and the right support section 35 play a supporting role, and strain occurs in the left strain section 32 and the right strain section 33. The axle sensor 3 and the weighing sensor have the same working principle, and are both devices that convert weight into electrical signals. The basic principle is to use the strain effect generated when the elastic material is deformed. Among them, the core component is an elastic material, such as a metal foil or a strain gauge. When an external force acts on the elastic material, it will deform. The degree of deformation is proportional to the force. This part is the left strain section 32 and the right strain section 33 described in this application. Deformation changes the resistance value of the elastic material. When the elastic material is deformed, its length increases and the cross-sectional area decreases, resulting in an increase in resistance. This phenomenon is called strain effect. The deformation of the elastic element causes a strain effect, thereby changing its resistance value. This resistance change is detected by a Wheatstone bridge connected to the elastic element. The Wheatstone bridge is an electrical circuit that can convert resistance changes into voltage output. The signal line of the wheel axle sensor 3 is connected to the signal processing module, and the output voltage can be converted into a corresponding pressure value after being processed by the signal processing module.

[0029] The weighing wheel 10 can be mass-produced and sold in batches, which greatly reduces the cost. The weighing wheel can be installed on the required equipment by only a few bolts, which is very convenient to assemble and disassemble. In addition, the weighing wheel itself has a simple and compact overall structure, occupies a small space, has high measurement accuracy, and is very convenient to assemble and disassemble, and has a wide range of applications. Embodiment 2

[0030] A weighing stretcher described in this embodiment, such as Figure 6 and Figure 7As shown, it includes: a stretcher 9, which can be any stretcher available on the market, and four weighing wheels are installed on the stretcher 9, and the weighing wheels are weighing wheels 10 designed in this application. A display screen with a signal processing module is also provided on the stretcher 9, and the signal lines of the axle sensors 3 on each weighing wheel 10 are connected to the signal transmission end of the signal processing module. The four axle sensors 3 transmit the signal to the signal processing module, and the signal processing module processes the received signal to obtain the corresponding pressure data, and displays the pressure data finally processed in digital form on the display screen, so that medical staff can intuitively understand the required information.

[0031] In order to facilitate the arrangement of the signal line of the axle sensor 3 and to improve the appearance, the signal line 39 of the axle sensor 3 is led out from the end of the right support section 35. At the same time, the left support plate 11 of each weighing wheel 10 installed on the stretcher 9 is located on the outside, and the right support plate 13 is located on the inside. At this time, all the signal lines 39 can be hidden at the bottom of the stretcher 9, which is both beautiful and will not cause the signal line 39 to be pulled. As for the weighing wheel 10 installed on the stretcher 9, only the left support section 31 slightly protruding from the left support plate 11 and the left part of the wheel frame can be seen on the outside, and the rest of the weighing wheel 10 is relatively hidden on the inside, which can also improve the overall appearance. In addition, such a setting can also play a certain safety role and prevent the operator from being accidentally scratched.

[0032] The weighing stretcher has the advantages of easy assembly and disassembly of the weighing wheel 10 and high weighing measurement accuracy.

[0033] The above description is only a preferred embodiment of the present invention and does not constitute any other form of limitation to the present invention. Any modification or equivalent change made based on the technical essence of the present invention still falls within the scope of protection required by the present invention.

Claims

1. A weighing wheel, comprising: A wheel frame, characterized in that it also includes: an axle sensor and a roller; the axle sensor is an integrated axle structure composed of a left support section, a left strain section, a middle support section, a right strain section, and a right support section; the roller is movably sleeved on the middle support section through an axial hole on the roller, and the roller is axially limited on the middle support section by an axial limiting member group; a first mounting through hole is provided on the left support plate of the wheel frame, and the left support section is supported in the first mounting through hole, a second mounting through hole is provided on the right support plate of the wheel frame, and the right support section is supported in the second mounting through hole, and a limiting structure for axially and circumferentially limiting the axle sensor is provided between the left support section and the wheel frame or between the right support section and the wheel frame.

2. A weighing wheel according to claim 1, characterized in that: The structure of the axial limit member group is as follows: an axial ring is arranged on the circumferential side wall at the left end of the middle support section, and a circle of concave annular groove is opened on the circumferential side wall at the right end of the middle support section; the axial hole on the roller is a step hole composed of a first axial hole and a second axial hole, the aperture of the first axial hole is larger than the aperture of the second axial hole, and after the roller is inserted from the right end of the wheel axle sensor, the step surface between the first axial hole and the second axial hole abuts against the right side end surface of the axial ring; after the roller and the connecting ring are successively inserted from the right end of the wheel axle sensor, the two semi-annular limit members are assembled at the annular groove, the inner rings of the two semi-annular limit members are located in the annular groove, and the two semi-annular limit members are fixedly connected to the right end of the connecting ring by a plurality of first screws.

3. A weighing wheel according to claim 2, characterized in that: When the roller is tightly attached to the connecting ring, the linear distance between the step surface between the first axial hole and the second axial hole and the right end surface of the axial ring is 2±1 mm.

4. A weighing wheel according to claim 1, 2 or 3, characterized in that: The limiting structure is as follows: two grooves with flat bottoms are symmetrically cut on the circumferential side wall of the right support section, and the bottoms of the two grooves pass through the circumferential side wall of the right support section. The bottoms of the two grooves are parallel to each other. After the U-shaped clamping plate is inserted into the two grooves, it is fixedly connected to the right end of the right support plate by a plurality of second screws.

5. A weighing stretcher, comprising: A stretcher, characterized in that: four weighing wheels are installed on the stretcher, and the weighing wheels are any one of claims 1 to 4, and the wheel frames on the weighing wheels are fixedly installed on the stretcher by a plurality of bolts; a display screen with a signal processing module is also provided on the stretcher, and the signal lines of the axle sensors on each weighing wheel are connected to the signal transmission end of the signal processing module.

6. A weighing stretcher according to claim 5, characterized in that: The signal line of the wheel-axle sensor is led out from the end of the right supporting section; the left supporting plate of each weighing wheel installed on the stretcher is located on the outside, and the right supporting plate is located on the inside.

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