Connecting rod weighing tool

Abstract

The utility model provides a connecting rod weighing tool, and relates to the field of gas engines. The connecting rod weighing tool comprises a connecting shaft and two weighing assemblies, each weighing assembly comprises a positioning shaft, a base and an electronic scale, one electronic scale is placed below the corresponding base, the two bases are fixedly connected with the connecting shaft, each base is provided with a placement position, and the positioning shaft is fixedly connected with the positioning shaft. One positioning shaft is placed on the corresponding placing position, and the axes of the two positioning shafts are located on the same horizontal plane. The installation state of the connecting rod is simulated through the connecting shaft, the two positioning shafts and the base, then the large end and the small end of the connecting rod are accurately measured through the two electronic scales, the connecting rods with the weight difference value within the same range are matched to the same engine, the assembly quality is ensured, and operation noise is reduced.

Description

Technical Field

[0001] This application relates to the field of gas engines, and more specifically, to a connecting rod weighing fixture. Background Technology

[0002] When installing the engine, the big end of the connecting rod is connected to the crankshaft, and the small end is connected to the piston. If the weight difference between the big end and the small end is too large, it will affect the dynamic balance, causing the crankshaft to break due to excessive centrifugal force during operation, thus shortening the engine's service life. In addition, an excessive weight difference between the big end and the small end will also cause excessive noise during engine operation, which does not meet the assembly requirements. Utility Model Content

[0003] The purpose of this application is to provide a connecting rod weighing fixture that can accurately measure the large and small ends of the connecting rod, and achieve the screening of the connecting rod by the weight difference to ensure assembly quality.

[0004] This utility model provides a connecting rod weighing fixture, which includes a connecting shaft and two sets of weighing components. Each set of weighing components includes a positioning shaft, a base, and an electronic scale. One electronic scale is placed under a corresponding base. The two bases are respectively fixedly connected to the connecting shaft, and each base has a placement position. One positioning shaft is placed in a corresponding placement position, and the axes of the two positioning shafts are located on the same horizontal plane.

[0005] In an optional embodiment, each of the bases includes a first side plate and a second side plate, the first side plate and the second side plate being arranged parallel to each other, the first side plate and the second side plate being respectively provided with a V-shaped groove, the extension direction of the V-shaped groove being parallel to the axial direction of the positioning shaft, and the two V-shaped grooves together forming the placement position.

[0006] In an optional embodiment, each of the bases further includes a third side plate and a fourth side plate, the third side plate and the fourth side plate being arranged parallel to each other, and the third side plate being perpendicularly adjacent to the first side plate.

[0007] In an optional embodiment, two driving components are further included. The two driving components are respectively disposed at both ends of the weighing assembly, and the driving ends of the two driving components are close to or far from each other. The movement direction of the two driving ends coincides with the axial direction of the connecting shaft.

[0008] In an optional embodiment, each of the positioning shafts includes a body and two protrusions, the two protrusions extending axially along the body and being positioned opposite each other on the placement position.

[0009] In an optional implementation, the two bodies are defined as a first body and a second body, respectively. The first body is adapted to the shape of the large end of the connecting rod, and the second body is adapted to the shape of the small end of the connecting rod.

[0010] In an optional embodiment, the connecting rod weighing fixture further includes two sets of positioning components. Each set of positioning components includes two cylinders and two sleeves. One cylinder is connected to a corresponding sleeve, and the two sleeves are respectively fitted onto the positioning shaft.

[0011] In an optional embodiment, the axial direction of both sleeves coincides with the axial direction of the positioning shaft.

[0012] In an optional embodiment, each sleeve is provided with a first clearance position, and when the sleeve moves to abut against the connecting rod, the base is located within the first clearance position.

[0013] In an optional embodiment, each of the sleeves is further provided with a second clearance position, and when the sleeve moves to abut against the connecting rod, the positioning shaft is located within the second clearance position.

[0014] Compared to existing technologies, the beneficial effects of this application are:

[0015] This application simulates the connecting rod installation state using a connecting shaft, two sets of positioning shafts, and a base. Then, two sets of electronic scales are used to accurately measure the large and small ends of the connecting rod. By subtracting the values ​​displayed by the two sets of electronic scales, the weight difference between the large and small ends can be obtained. The connecting rods are screened by using the weight difference, and connecting rods with the same weight difference range are matched to the same engine to ensure assembly quality, reduce operating noise, and improve service life. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the planar structure of the link is shown in some embodiments;

[0018] Figure 2 A plan view of the connecting rod weighing fixture in some embodiments is shown (some components are omitted);

[0019] Figure 3 A three-dimensional schematic diagram of the connecting rod weighing fixture in some embodiments is shown (some components are omitted);

[0020] Figure 4 A three-dimensional structural diagram of the positioning axis is shown in some embodiments;

[0021] Figure 5 A schematic diagram of the connection between the base and the positioning shaft is shown in some embodiments;

[0022] Figure 6 A perspective view of another link weighing fixture in some embodiments is shown (some components are omitted);

[0023] Figure 7 A three-dimensional structural diagram of the sleeve in some embodiments is shown.

[0024] Explanation of key component symbols:

[0025] 10-Linkage weighing fixture; 100-Connecting shaft; 200-Weighing assembly; 210-Positioning shaft; 211-Body; 212-Protrusion; 220-Base; 221-First side plate; 222-Second side plate; 223-Third side plate; 224-Fourth side plate; 225-Placement position; 230-Electronic scale; 300-Drive component; 400-Positioning assembly; 410-Cylinder; 420-Sleeve; 421-First clearance position; 422-Second clearance position;

[0026] 20 - Connecting rod; 21 - Big end; 22 - Small end. Detailed Implementation

[0027] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0028] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the tooling or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0030] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0031] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0032] Please see Figure 1 This embodiment is applicable to weighing both ends of the connecting rod 20 separately. For ease of description and understanding, this embodiment defines the end with the larger diameter as the large end 21 and the end with the smaller diameter as the small end 22. The large end 21 is provided with a first hole, and the small end 22 is provided with a second hole. The axial direction of the second hole is parallel to the axial direction of the first hole. The axial direction of the first hole is taken as the first direction, and the length direction of the connecting rod 20 is taken as the second direction.

[0033] Please see Figures 1 to 3 This embodiment provides a connecting rod weighing fixture 10, which includes a connecting shaft 100 and two sets of weighing components 200.

[0034] Each weighing assembly 200 includes a positioning shaft 210, a base 220, and an electronic scale 230. An electronic scale 230 is placed under a corresponding base 220. The two bases 220 are fixedly connected to the connecting shaft 100, and each base 220 is provided with a placement position 225. A positioning shaft 210 is placed on a corresponding placement position 225, and the axes of the two positioning shafts 210 are located on the same horizontal plane.

[0035] In this embodiment, the two positioning shafts 210 are defined as the first positioning shaft and the second positioning shaft, respectively. The first positioning shaft passes through the first hole, and the second positioning shaft passes through the second hole. The outer periphery of the first positioning shaft is adapted to the inner wall of the first hole, and the outer periphery of the second positioning shaft is adapted to the inner wall of the second hole, thereby ensuring that the connecting rod 20 is stably connected to the first positioning shaft and the second positioning shaft, and will not shake during the weighing process, thus affecting the weighing results.

[0036] Please see Figure 1 , Figure 3 and Figure 4 Each positioning axis 210 includes a body 211 and two protrusions 212. The two protrusions 212 extend along the axial direction of the body 211 and are positioned opposite each other on the placement position 225. The axial direction of the body 211 is a first direction. That is, the first positioning axis includes the body 211 and the two protrusions 212, and the second positioning axis also includes the body 211 and the two protrusions 212.

[0037] The two bodies 211 are defined as the first body and the second body, respectively. The first body is adapted to the shape of the large end 21 of the connecting rod 20, and the second body is adapted to the shape of the small end 22 of the connecting rod 20. That is, the first body is adapted to the shape of the first hole, and the second body is adapted to the shape of the second hole. The two protrusions 212 of the first positioning shaft are placed on one placement position 225, and the two protrusions 212 of the second positioning shaft are placed on another placement position 225.

[0038] Please see Figure 1 and Figure 5 Each base 220 includes a first side plate 221 and a second side plate 222. The first side plate 221 and the second side plate 222 are arranged parallel to each other. The first side plate 221 and the second side plate 222 are respectively provided with V-shaped grooves. The extension direction of the V-shaped grooves is parallel to the axial direction of the positioning shaft 210. The two V-shaped grooves together form a placement position 225.

[0039] Each base 220 also includes a third side plate 223 and a fourth side plate 224, the third side plate 223 and the fourth side plate 224 are arranged parallel to each other, and the third side plate 223 is perpendicularly adjacent to the first side plate 221.

[0040] As described above, the first side plate 221, the third side plate 223, the second side plate 222, and the fourth side plate 224 of the base 220 are connected end to end to form a closed loop, thereby improving the reliability and stability of the base 220 and ensuring that the connecting rod 20 will not shake during weighing, thus improving the weighing accuracy.

[0041] When preparing the base 220, the two bases 220 are V-shaped fixtures of equal height, which are processed by the same CNC equipment. After installation, it can be ensured that the axis of the first hole and the axis of the second hole are on the same horizontal plane.

[0042] Please see Figures 1 to 3 In this embodiment, the connecting shaft 100, two sets of positioning shafts 210 and base 220 are used to simulate the installation state of the connecting rod 20. Therefore, by measuring the large end 21 and the small end 22 in a near-real assembly state, it can be ensured that the connecting rod 20 remains consistent in both weighing and assembly states.

[0043] The connecting rod weighing fixture 10 also includes two driving components 300. The two driving components 300 are respectively disposed at both ends of the weighing assembly 200 along the second direction, and the driving ends of the two driving components 300 are close to or far from each other. The movement direction of the two driving ends coincides with the axial direction of the connecting shaft 100.

[0044] Activate the two drive units 300, bring the two drive ends close to each other until they abut against the base 220, and clamp the base 220 so that the base 220 remains in a fixed position in different weighing cycles. That is, in different weighing cycles, the base 220 is always placed in a fixed position on the electronic scale 230 to avoid measurement errors caused by position movement.

[0045] After adjusting the position of the base 220, the connecting rod 20 can be installed. In this embodiment, the drive component 300 can be set as an adjustable speed cylinder to meet different weighing requirements.

[0046] Please see Figure 1 , Figure 2 and Figure 6 The connecting rod weighing fixture 10 also includes two sets of positioning components 400. Each positioning component 400 includes two cylinders 410 and two sleeves 420. One cylinder 410 is connected to a corresponding sleeve 420, and the two sleeves 420 are respectively sleeved on the positioning shaft 210. The axial direction of the two sleeves 420 coincides with the axial direction of the positioning shaft 210.

[0047] Under the forward drive of cylinder 410, sleeve 420 moves toward connecting rod 20; under the reverse drive of cylinder 410, sleeve 420 moves away from connecting rod 20. In this embodiment, the two sets of positioning components 400 can be configured to include four cylinders 410 and four sleeves 420. The four cylinders 410 are of the same type, and the four sleeves 420 are of the same size. During each weighing cycle, the positioning components 400 clamp the connecting rod 20, ensuring that the connecting rod 20 is always in the same position.

[0048] Please see Figure 1 , Figure 6 and Figure 7Each sleeve 420 is provided with a first clearance position 421. When the sleeve 420 moves to abut the connecting rod 20, the base 220 is located within the first clearance position 421. Each sleeve 420 is also provided with a second clearance position 422. When the sleeve 420 moves to abut the connecting rod 20, the positioning shaft 210 is located within the second clearance position 422.

[0049] In this embodiment, by setting the first clearance position 421 and the second clearance position 422, it is ensured that the sleeve 420 can move onto the connecting rod 20, and the sleeves 420 on both sides move closer to the connecting rod 20, thereby adjusting the shape of the connecting rod 20. After the adjustment is completed, the positioning component 400 is removed, and the electronic scale 230 weighs the connecting rod 20.

[0050] In practical applications, when different models of connecting rods 20 are installed, the dimensions of the connecting rods 20 are different, and the shape of the connecting rods 20 needs to be adjusted to ensure that the connecting rods 20 are always placed in the same position on the base 220, so as to facilitate repeated weighing and improve weighing accuracy.

[0051] Understandably, at this point, the electronic scale 230 only contains the connecting rod 20 and the weighing component 200. After weighing, it is only necessary to subtract the weight of the weighing component 200 that has been weighed beforehand to obtain the weight values ​​of the large end 21 and the small end 22. Finally, the weight of the large end 21 is subtracted from the weight of the small end 22 to obtain the weight difference. The connecting rod 20 is screened through the weight difference, and connecting rods 20 with the same weight difference range are matched to the same engine to ensure assembly quality, reduce operating noise, and improve service life.

[0052] In this embodiment, the connecting rod 20 with a weight difference of less than 30 grams between the large end 21 and the small end 22 can be matched to the same engine to avoid excessive weight difference affecting dynamic balance, protect the normal crankshaft operation, improve engine service life, and the connecting rod 20 that meets the requirements has good stability and low noise after assembly.

[0053] This embodiment can also be set such that if the weight difference between the large end 21 and the small end 22 is greater than 30 grams, it is evaluated as a defective product and enters the rework or scrapping procedure.

[0054] Please see Figure 1 , Figure 3 and Figure 6 Based on the above, the operating principle of the connecting rod weighing fixture 10 in this embodiment will be further explained as follows:

[0055] S100. Place the two bases 220 on the corresponding electronic scale 230 respectively.

[0056] S200. Start the two drive units 300. The drive ends of the two drive units 300 move closer to the base 220 and clamp the base 220, thereby adjusting the placement position 225 of the base 220.

[0057] S300. Pass the first positioning shaft through the first hole and the second positioning shaft through the second hole.

[0058] S400. Place the first positioning shaft on one placement position 225 and place the second positioning shaft on another placement position 225 to assemble the connecting rod 20.

[0059] S500. Start cylinder 410, adjust the shape of connecting rod 20 through sleeve 420, and after adjustment, start cylinder 410 in reverse and remove sleeve 420.

[0060] S600. Start the electronic scale 230. The two electronic scales 230 weigh the large head 21 and small head 22 on the two bases 220 respectively.

[0061] It is understandable that the weight of the base 220 can be weighed beforehand and subtracted from the weight of the base 220 in step S600.

[0062] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0063] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A connecting rod weighing tool, characterized by, The connecting shaft and two groups of weighing assemblies are included, each group of the weighing assemblies includes a positioning shaft, a base and an electronic scale, one of the electronic scales is placed under a corresponding one of the bases, two of the bases are fixedly connected with the connecting shaft respectively, and each of the bases is provided with a placing position, one of the positioning shafts is placed on a corresponding one of the placing positions, and the axes of the two positioning shafts are located on the same horizontal plane.

2. The connecting rod weighing tool according to claim 1, wherein Each of the bases includes a first side plate and a second side plate, the first side plate and the second side plate are arranged parallel to each other, the first side plate and the second side plate are respectively provided with V-shaped grooves, the extension direction of the V-shaped grooves is parallel to the axis direction of the positioning shaft, and the two V-shaped grooves jointly form the placing position.

3. The connecting rod weighing tool of claim 2, wherein Each of the bases further includes a third side plate and a fourth side plate, the third side plate and the fourth side plate are arranged parallel to each other, and the third side plate is vertically adjacent to the first side plate.

4. The connecting rod weighing tool according to any one of claims 1 to 3, characterized in that Two driving members are further included, the two driving members are arranged at two ends of the weighing assembly respectively, and the driving ends of the two driving members are close to or away from each other, the movement direction of the two driving ends coincides with the axis direction of the connecting shaft.

5. The connecting rod weighing tool according to any one of claims 1 to 3, wherein Each of the positioning shafts includes a body and two protruding parts, the two protruding parts extend along the axial direction of the body respectively, and the two protruding parts are arranged opposite to each other and placed on the placing position.

6. The connecting rod weighing tool of claim 5, wherein, The two bodies are defined as a first body and a second body respectively, the first body is matched with the shape of the large head of the connecting rod, and the second body is matched with the shape of the small head of the connecting rod.

7. The link weighing tool according to any one of claims 1 to 3, wherein Two groups of positioning assemblies are further included, each group of the positioning assemblies includes two cylinders and two sleeves, one of the cylinders is connected with a corresponding one of the sleeves, and the two sleeves are sleeved on the positioning shafts respectively.

8. The connecting rod weighing apparatus according to claim 7, wherein The axis direction of the two sleeves coincides with the axis direction of the positioning shaft.

9. The connecting rod weighing tool of claim 8, wherein, Each of the sleeves is provided with a first avoiding position, when the sleeve moves to abut against the connecting rod, the base is located in the first avoiding position.

10. The connecting rod weighing tool of claim 9, wherein, Each of the sleeves is further provided with a second avoiding position, when the sleeve moves to abut against the connecting rod, the positioning shaft is located in the second avoiding position.

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