Automatic assembly method for piston connecting rod

Abstract

The invention discloses an automatic assembling method for a piston connecting rod. The method comprises the steps that a tray enters a station to confirm that an automatic mounting station is in a Bypass state; the tray positioning and pressing device is used for positioning an upper-layer tray of the trays; feeding to an oil injection station for cylinder hole oil injection; a crankshaft turning tool is manually taken, and the piston is manually pushed in; connecting rod bolts are manually installed and pre-screwed on the opposite side; turning the crankshaft to a repeated process; the positioning pin and the support shaft are supported on the process support arm on the exhaust side; directly tightening the shaft cover step by step; the automatic turning tool turns the crankshaft to the next tightening position; after tightening is finished, the robot returns to the original position and grabs and installs a second set of connecting rod assemblies and connecting rod covers; the processes are repeated, and the third to last connecting rod covers and bolts are pre-assembled and tightened respectively; the servo turning tool rotates the connecting rod to a correct angular direction; turning over the workpiece, adjusting the posture of the workpiece to enable the top surface to face upwards, and putting the workpiece back to the tray; and the machine equipment enters the next cycle. Pure manual assembly is changed into full-automatic or semi-automatic assembly, and the problem of low efficiency is effectively solved.

Description

Technical Field

[0001] The invention relates to the field of engine design and manufacturing, in particular to an automatic assembly method for a piston connecting rod. Background Art

[0002] The disassembly and assembly of the piston-connecting rod assembly is a delicate process that requires strict adherence to procedures to avoid damage to the engine. The disassembly and assembly steps in the prior art are roughly as follows:

[0003] Disassembly steps:

[0004] When disassembling, remove the peripheral accessories in order from top to bottom.

[0005] When removing the cylinder head, it is important to loosen the cylinder head bolts symmetrically from both ends to the middle in several steps to prevent deformation of the cylinder head.

[0006] Remove the oil pan.

[0007] Check the assembly mark on the top of the piston. If there is no mark, mark it and indicate the cylinder number.

[0008] Turn the crankshaft until the piston corresponding to the connecting rod to be removed reaches the bottom dead center position.

[0009] Remove the connecting rod nut, gently take out the connecting rod cap and bearing, and place them in order.

[0010] Use a rubber hammer or a hammer with a wooden handle to push the piston-connecting rod assembly out smoothly to avoid damage to the cylinder due to tilting, prying or hard knocking.

[0011] After removing the piston-connecting rod assembly, reinstall the connecting rod cover, bolts, and nuts as they were, and check the assembly marks on the connecting rod to ensure that the marks are facing the correct direction and are marked with the corresponding cylinder number.

[0012] Use special tools to remove the piston ring, making sure the "TOP" mark on the piston ring faces the top of the piston.

[0013] When removing the piston, first heat it to 60 degrees Celsius and then remove the piston pin.

[0014] Notes:

[0015] It is necessary to observe and remember the position and markings of each disassembled part.

[0016] Before pulling out the piston-connecting rod assembly, it is necessary to clean the carbon deposits on the cylinder liner to avoid damage to the piston and piston rings.

[0017] After the piston-connecting rod assembly is pulled out, it is best to immediately reinstall the connecting rod cover, tile and connecting rod bolts to their original position.

[0018] When removing the cylinder liner, do not use a metal rod to directly hit the cylinder liner.

[0019] The removed piston rings should be placed in order.

[0020] The above are the basic steps and precautions for disassembling and assembling the piston-connecting rod assembly. However, the piston-connecting rod assembly in the existing technology is basically manual assembly, which is inefficient and the assembly quality and assembly risks are difficult to control.

[0021] The information disclosed in this background technology section is only intended to enhance understanding of the overall background of the invention and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the Invention

[0022] The purpose of the present invention is to provide an automatic assembly method for a piston connecting rod, which adapts the purely manual assembly of the prior art to fully automatic or semi-automatic assembly, effectively solving the problems of low efficiency, difficult to control assembly quality and assembly risks.

[0023] To achieve the above-mentioned purpose, the present invention provides an automatic assembly method for a piston connecting rod, comprising: the pallet enters the workstation, the pallet is positioned, the TAG information of the pallet is read, the workpiece information is confirmed, and the automatic installation workstation is confirmed to be in the Bypass state; the pallet positioning and clamping device positions the upper pallet of the pallet; the large robot gripper grabs the process arm positioning point to lift the workpiece from the pallet, and sends it to the injection station for cylinder bore injection, and after flipping, it is placed on a manual positioning table outside the line, with the workpiece exhaust facing downward, and the positioning pin and the support shaft are supported on the process arm on the exhaust side; manually take the crankshaft turning tooling, and turn the crankshaft to the correct angular direction; manually move the ring-collecting tooling to the workpiece, manually advance the guide fork to connect the connecting rod, and manually push in the piston; manually install and pre-tighten the connecting rod bolts on the opposite side; turn the crankshaft to repeat the process and pre-assemble them respectively The second to the last connecting rod cover and bolts; the large robot gripper grabs the process arm positioning point and lifts the workpiece from the mounting table. On the positioning table in the automatic installation position, the exhaust side of the workpiece faces downward, and the positioning pin and support shaft are supported on the process arm on the exhaust side; the tightening machine on the oil pan surface does not grab the shaft cover, but directly tightens the shaft cover in steps; the automatic turning tool turns the crankshaft to the next tightening position; after tightening, the robot returns to its original position and grabs and installs the second set of connecting rod assemblies and connecting rod covers; repeat the process to pre-install and tighten the third to the last connecting rod cover and bolts, and tighten the bolts; in this process, the servo turning tool rotates the connecting rod to the correct angular direction; after the connecting rod bolts are tightened, the large robot flips the workpiece and adjusts the workpiece posture to have the top surface facing up and places it back on the pallet; the robot returns to its original position, the pallet is released, and the equipment enters the next cycle.

[0024] In a preferred embodiment, after the oil injection station performs oil injection into the cylinder bore, the large robot gripper flips the workpiece 90 degrees.

[0025] In a preferred embodiment, a piston ring-collecting mechanism is provided on the side of the manual positioning platform facing the top surface of the cylinder body, and a quick-change guide fork is provided on the side of the manual positioning platform facing the bottom surface of the cylinder body.

[0026] In a preferred embodiment, after the connecting rod bolts are tightened, the large robot flips the workpiece 180 degrees and then adjusts the posture of the workpiece so that the top surface faces upward and is placed back on the pallet.

[0027] In a preferred embodiment, the workpiece is a cylinder.

[0028] In a preferred embodiment, the parts assembled by the automatic assembly method include a cylinder body, a piston-connecting rod assembly, a connecting rod cover and bolts, and a connecting rod bearing.

[0029] In a preferred embodiment, the automatic assembly method of the piston connecting rod also includes data tracing and error proofing processes, which include RFID reading of workpiece type error proofing, component type error proofing, posture error proofing, tightening data storage, shaft cover sequence error proofing, and process data error proofing.

[0030] In a preferred embodiment, the automatic assembly method of the piston connecting rod also includes a safety process, which includes FLC interlocking, safety door lock and guardrail, part in place detection and workpiece correct seating gas detection.

[0031] In a preferred embodiment, the automatic assembly method of the piston connecting rod also includes process requirements, which include requiring oil spraying on the cylinder bore during assembly; requiring the piston and cylinder body to have assembly direction requirements; requiring the piston connecting rod assembly to be automatically guided, automatically inserted into the cylinder, automatically covered and pre-tightened; and requiring the sub-station set fit rate to be ≥99%.

[0032] Compared with the existing technology, the automatic assembly method of the piston connecting rod of the present invention has the following beneficial effects: this automatic assembly method adapts the pure manual assembly of the existing technology into fully automatic or semi-automatic assembly through the equipment body and frame, pallet and positioning system, cylinder grabbing and turning mechanism, piston connecting rod manual installation double-position workbench, ring-collecting quick-change tooling and slide, connecting rod fork and slide, and cylinder code reading device, etc., effectively solving the problems of low efficiency, assembly quality and difficult to control assembly risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figures 1 to 2 1 is a schematic diagram of the equipment layout of an automatic assembly method for a piston connecting rod according to an embodiment of the present invention;

[0034] Figure 3 is a schematic diagram of a device body and a frame according to one embodiment of the present invention;

[0035] Figure 4 is a schematic diagram of a tray and a positioning system according to one embodiment of the present invention;

[0036] Figure 5 is a schematic diagram of a grabbing and turning mechanism of a cylinder according to one embodiment of the present invention;

[0037] Figure 6 This is a schematic diagram of a two-position workbench for manually installing a piston and connecting rod according to one embodiment of the present invention;

[0038] Figure 7 This is a schematic diagram of a loop-closing quick-change fixture and a slide according to one embodiment of the present invention;

[0039] Figure 8 is a schematic diagram of a connecting rod fork and a slide according to one embodiment of the present invention;

[0040] Figure 9 1 is a schematic diagram of a cylinder code reader according to one embodiment of the present invention. DETAILED DESCRIPTION

[0041] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0042] Unless expressly stated otherwise, throughout the specification and claims, the term "comprise" or variations such as "include" or "comprising", etc., will be understood to include the stated elements or components but not to exclude other elements or other components.

[0043] like Figures 1 to 9 As shown, according to the automatic assembly method of the piston connecting rod in the preferred embodiment of the present invention, the following is a detailed description taking the process flow of several typical models as an example.

[0044] 1. The process flow of the first Y-head front and rear models:

[0045] The pallet enters the workstation, the pallet is positioned, the pallet's TAG information is read, the workpiece information is confirmed, and the automatic installation station is confirmed to be in the Bypass state;

[0046] The pallet positioning and pressing device positions the upper pallet of the pallet;

[0047] The large robot gripper grabs the positioning point of the process support arm and lifts the workpiece from the pallet. It is then sent to the injection station for cylinder bore injection. The workpiece is then flipped 90 degrees and placed on a manual positioning table outside the production line, with the cylinder exhaust facing downward (the workpiece lies flat on the mounting table). The positioning pins and support shafts are supported on the process support arm on the exhaust side.

[0048] Manually take the crankshaft turning tool and turn the crankshaft to the correct angle;

[0049] The top and bottom surfaces of the cylinder body of the positioning platform are equipped with a set of quick-change piston ring-collecting mechanisms. The ring-collecting tooling is manually moved to the cylinder body. The manual slide towards the bottom surface of the cylinder body is equipped with a set of quick-change guide forks. The guide forks are manually advanced to connect the connecting rod and the piston is manually pushed in.

[0050] Manually install and pre-tighten the connecting rod bolts on the opposite side;

[0051] Crankshaft and repeat the process to pre-install the 2nd to 4th connecting rod caps and bolts respectively;

[0052] The large robot gripper grabs the process arm positioning point and lifts the workpiece from the mounting table. The workpiece is automatically mounted on the positioning table with the cylinder exhaust side facing downward (the workpiece lies flat on the mounting table). The positioning pin and support shaft are supported on the process arm on the exhaust side.

[0053] The tightening machine on the oil pan surface does not grab the shaft cover, but directly tightens the shaft cover in steps;

[0054] The automatic turning tool turns the crankshaft to the next tightening position;

[0055] After tightening, the robot returns to its original position and grabs and installs the second set of connecting rod components and connecting rod covers;

[0056] Repeat the process to pre-install and tighten the 3rd to 4th connecting rod covers and bolts respectively, and tighten the bolts;

[0057] In this process, the servo turning fixture rotates the connecting rod to the correct angular direction;

[0058] After the connecting rod bolts are tightened, the large robot turns the cylinder body 180 degrees and adjusts the workpiece posture so that the top surface faces upward and returns it to the pallet;

[0059] The robot returns to its original position, the pallet is released, and the equipment enters the next cycle.

[0060] The main assembly parts involved in this process are shown in Table 1:

[0061] Table 1

[0062]

[0063] 2. The second K-type machine process flow:

[0064] The pallet enters the workstation, the pallet is positioned, the pallet's TAG information is read, the workpiece information is confirmed, and the automatic installation station is confirmed to be in the Bypass state;

[0065] The pallet positioning and pressing device positions the upper pallet of the pallet;

[0066] The large robot gripper grabs the positioning point of the process support arm and lifts the workpiece from the pallet. It is then sent to the injection station for cylinder bore injection. The workpiece is then flipped 90 degrees and placed on a manual positioning table outside the production line, with the cylinder exhaust facing downward (the workpiece lies flat on the mounting table). The positioning pins and support shafts are supported on the process support arm on the exhaust side.

[0067] Manually take the crankshaft turning tool and turn the crankshaft to the correct angle;

[0068] The top and bottom surfaces of the cylinder body of the positioning platform are equipped with a set of quick-change piston ring-collecting mechanisms. The ring-collecting tooling is manually moved to the cylinder body. The manual slide towards the bottom surface of the cylinder body is equipped with a set of quick-change guide forks. The guide forks are manually advanced to connect the connecting rod and the piston is manually pushed in.

[0069] Manually install and pre-tighten the connecting rod bolts on the opposite side;

[0070] Crankshaft and repeat the process to pre-install the 2nd to 6th connecting rod caps and bolts respectively;

[0071] The large robot gripper grabs the process arm positioning point and lifts the workpiece from the mounting table. The workpiece is automatically mounted on the positioning table with the cylinder exhaust side facing downward (the workpiece lies flat on the mounting table). The positioning pin and support shaft are supported on the process arm on the exhaust side.

[0072] The tightening machine on the oil pan surface does not grab the shaft cover, but directly tightens the shaft cover in steps;

[0073] The automatic turning tool turns the crankshaft to the next tightening position;

[0074] After tightening, the robot returns to its original position and grabs and installs the second set of connecting rod components and connecting rod covers;

[0075] Repeat the process to pre-install and tighten the 2nd to 6th connecting rod covers and bolts respectively, and tighten the bolts;

[0076] In this process, the servo turning fixture rotates the connecting rod to the correct angular direction;

[0077] After the connecting rod bolts are tightened, the large robot turns the cylinder body 180 degrees and adjusts the workpiece posture so that the top surface faces upward and returns it to the pallet;

[0078] The robot returns to its original position, the pallet is released, and the equipment enters the next cycle.

[0079] The main assembly parts involved in this process are shown in Table 2:

[0080] Table 2

[0081]

[0082] 3. The third type of A-type N machine process flow:

[0083] The pallet enters the workstation, the pallet is positioned, the pallet's TAG information is read, the workpiece information is confirmed, and the automatic installation station is confirmed to be in the Bypass state;

[0084] The pallet positioning and pressing device positions the upper pallet of the pallet;

[0085] The large robot gripper grabs the positioning point of the process support arm and lifts the workpiece from the pallet. It is then sent to the injection station for cylinder bore injection. The workpiece is then flipped 90 degrees and placed on a manual positioning table outside the production line, with the cylinder exhaust facing downward (the workpiece lies flat on the mounting table). The positioning pins and support shafts are supported on the process support arm on the exhaust side.

[0086] Manually take the crankshaft turning tool and turn the crankshaft to the correct angle;

[0087] The top and bottom surfaces of the cylinder body of the positioning platform are equipped with a set of quick-change piston ring-collecting mechanisms. The ring-collecting tooling is manually moved to the cylinder body. The manual slide towards the bottom surface of the cylinder body is equipped with a set of quick-change guide forks. The guide forks are manually advanced to connect the connecting rod and the piston is manually pushed in.

[0088] Manually install and pre-tighten the connecting rod bolts on the opposite side;

[0089] Crankshaft and repeat the process to pre-install the 2nd to 6th connecting rod caps and bolts respectively;

[0090] The large robot gripper grabs the process arm positioning point and lifts the workpiece from the mounting table. The workpiece is automatically mounted on the positioning table with the cylinder exhaust side facing downward (the workpiece lies flat on the mounting table). The positioning pin and support shaft are supported on the process arm on the exhaust side.

[0091] The tightening machine on the oil pan surface does not grab the shaft cover, but directly tightens the shaft cover in steps;

[0092] The automatic turning tool turns the crankshaft to the next tightening position;

[0093] After tightening, the robot returns to its original position and grabs and installs the second set of connecting rod components and connecting rod covers;

[0094] Repeat the process to pre-install and tighten the 2nd to 6th connecting rod covers and bolts respectively, and tighten the bolts;

[0095] In this process, the servo turning fixture rotates the connecting rod to the correct angular direction;

[0096] After the connecting rod bolts are tightened, the large robot turns the cylinder body 180 degrees and adjusts the workpiece posture so that the top surface faces upward and returns it to the pallet;

[0097] The robot returns to its original position, the pallet is released, and the equipment enters the next cycle.

[0098] The main assembly parts involved in this process are shown in Table 3:

[0099] Table 3

[0100]

[0101]

[0102] The process of the automatic assembly method of the piston connecting rod of the present invention is roughly as follows, please refer to Table 4:

[0103] Table 4

[0104]

[0105] The station equipment scheme of the automatic assembly method of the piston connecting rod of the present invention is roughly described as follows, please refer to Table 5:

[0106] Table 5

[0107]

[0108]

[0109]

[0110] The process chart of the automatic assembly method of the piston connecting rod of the present invention is roughly as follows, please refer to Table 6: Table 6

[0111]

[0112]

[0113] The equipment composition of the automatic assembly method of the piston connecting rod of the present invention is roughly as follows:

[0114] 1. For the device body and frame, please refer to Figure 3 (appendix Figure 3 ):

[0115] ●The equipment frame adopts a frame structure with a bottom plate;

[0116] ●Use aluminum profile for protection;

[0117] ●Semi-automatic workstation, operated by a double-station turntable;

[0118] ●Light curtain protection is used at the manual operation area;

[0119] The turntable can only operate after the operator steps outside the light curtain and presses the start switch at the same time;

[0120] ●After grabbing the piston, scan the code before assembling it online.

[0121] 2. Pallet and positioning system, please refer to Figure 4 (appendix Figure 4 ):

[0122] ●The pallet adopts a positioning system for clamping and positioning the pallet.

[0123] 3. For the grabbing and turning mechanism of the cylinder, please refer to Figure 5 (appendix Figure 5 ):

[0124] The robot is equipped with quick-change grippers for grasping different products;

[0125] The robot grasps the front and rear ends of the workpiece to facilitate the flipping of the workpiece posture;

[0126] ●The robot's sixth axis rotation is used to adjust the cylinder body from inverted to lying on its side and then to upright on the line. In the upright state, process supports are used to support the cylinder body.

[0127] 4. For manual installation of piston and connecting rod, please refer to the double-position workbench. Figure 6 (appendix Figure 6 ):

[0128] ●The placement table is in the form of an exchange workbench;

[0129] Two sets of tooling are placed on the workbench, one for loading and unloading the robot, and the other for two people to install the piston connecting rod assembly and connecting rod cover;

[0130] When the cylinder body is lying on its side, a ring-collecting mechanism is installed on the surface of the cylinder hole. This mechanism adopts a quick-change structure. The ring-collecting mechanism uses a manual slide along the length of the cylinder body to move the ring-collecting mechanism one by one to the press-fitting position of different cylinder holes.

[0131] When the cylinder body is lying on its side, a set of connecting rod forks are provided on the bottom of the cylinder body to guide the connecting rod assembly.

[0132] A manual slide is used along the length direction of the cylinder body to send the material receiving fork to the press-fitting position of different cylinder holes one by one;

[0133] ●A set of pre-tightening guns is provided for tightening the shaft cover.

[0134] 5. For quick-change tooling and slides, please refer to Figure 7 (appendix Figure 7 ):

[0135] The ring closing tooling adopts three sets of quick-change tooling according to the type of piston;

[0136] ●The tooling is equipped with three degrees of freedom manual slide motion on the slide.

[0137] 6. Connect the connecting rod fork and slide, please refer to Figure 8 (appendix Figure 8 ):

[0138] The fork tooling adopts three sets of quick-change tooling according to the type of connecting rod;

[0139] ●The tooling is equipped with three degrees of freedom manual slide motion on the slide.

[0140] 7. Cylinder code reading, please refer to Figure 9 (appendix Figure 9 ):

[0141] ●Use a set of manual code reading device (code reader or scanner gun) to scan the code on the piston connecting rod assembly.

[0142] To sum up, the automatic assembly method of the piston connecting rod of the present invention has the following advantages: this automatic assembly method adapts the pure manual assembly of the existing technology into fully automatic or semi-automatic assembly through the equipment body and frame, pallet and positioning system, cylinder grabbing and turning mechanism, piston connecting rod manual installation double-position workbench, ring-collecting quick-change tooling and slide, connecting rod fork and slide, and cylinder code reading device, etc., effectively solving the problems of low efficiency, assembly quality and difficult to control assembly risks.

[0143] The foregoing descriptions of specific exemplary embodiments of the present invention are for purposes of illustration and description. These descriptions are not intended to limit the invention to the precise forms disclosed, and it is apparent that many variations and modifications are possible in light of the foregoing teachings. The exemplary embodiments have been selected and described for the purpose of explaining the specific principles of the invention and their practical application, thereby enabling those skilled in the art to realize and utilize a variety of exemplary embodiments of the invention and various options and modifications. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. A method for automatically assembling a piston connecting rod, characterized in that: include: The pallet enters the workstation, the pallet is positioned, the pallet's TAG information is read, the workpiece information is confirmed, and the automatic installation station is confirmed to be in the Bypass state; The pallet positioning and pressing device positions the upper pallet of the pallet; The large robot gripper grabs the positioning point of the process support arm and lifts the workpiece from the pallet. It is then sent to the oil injection station for cylinder bore oil injection. After flipping, it is placed on a manual positioning table outside the production line, with the exhaust facing downwards. The positioning pins and support shafts are supported on the process support arm on the exhaust side. Manually take the crankshaft turning tool and turn the crankshaft to the correct angle; Manually move the ring collecting fixture to the workpiece, manually advance the guide fork to connect the connecting rod, and manually push in the piston; Manually install and pre-tighten the connecting rod bolts on the opposite side; Crank the crankshaft and repeat the process to pre-install the second to last connecting rod caps and bolts respectively; The large robot gripper grabs the positioning point of the process support arm and lifts the workpiece from the mounting table. The workpiece is automatically mounted on the positioning table with the exhaust side facing downwards. The positioning pin and support shaft are supported on the process support arm on the exhaust side. The tightening machine on the oil pan surface does not grab the shaft cover, but directly tightens the shaft cover in steps; The automatic turning tool turns the crankshaft to the next tightening position; After tightening, the robot returns to its original position and grabs and installs the second set of connecting rod components and connecting rod covers; Repeat the process to pre-install and tighten the third to last connecting rod caps and bolts, and tighten the bolts; In this process, the servo turning fixture rotates the connecting rod to the correct angular direction; After the connecting rod bolts are tightened, the large robot flips the workpiece over and adjusts its posture so that the top surface faces upwards and places it back on the pallet; The robot returns to its original position, the pallet is released, and the equipment enters the next cycle.

2. The automatic assembly method of a piston connecting rod according to claim 1, characterized in that: After the oil injection station sprays oil into the cylinder bore, the large robot gripper flips the workpiece 90 degrees.

3. The automatic assembly method of a piston connecting rod according to claim 1, characterized in that: A set of piston ring-collecting mechanisms is arranged on one side of the manual positioning platform facing the top surface of the cylinder body, and a set of quick-change guide forks is arranged on one side of the manual positioning platform facing the bottom surface of the cylinder body.

4. The automatic assembly method of a piston connecting rod according to claim 1, characterized in that: After the connecting rod bolts are tightened, the large robot flips the workpiece 180 degrees and then adjusts the workpiece's posture so that the top surface faces up and places it back on the pallet.

5. The automatic assembly method of a piston connecting rod according to claim 1, characterized in that: The workpiece is a cylinder body.

6. The automatic assembly method of a piston connecting rod according to claim 5, characterized in that: The parts assembled by the automatic assembly method include cylinder body, piston connecting rod assembly, connecting rod cover and bolts, and connecting rod bearing.

7. The automatic assembly method of a piston connecting rod according to claim 1, characterized in that: It also includes data traceability and error prevention processes, which include RFID reading of workpiece type error prevention, component type error prevention, posture error prevention, tightening data storage, shaft cover sequence error prevention, and process data error prevention.

8. The automatic assembly method of a piston connecting rod according to claim 1, characterized in that: It also includes safety processes, which include FLC interlocks, safety door locks and guardrails, part in-place detection, and gas detection of correct seating of workpieces.

9. The automatic assembly method of a piston connecting rod according to claim 1, characterized in that: It also includes process requirements, including the requirement to spray oil into the cylinder bore during assembly; the assembly direction requirements for the piston and cylinder body; the requirement that the piston-connecting rod assembly be automatically guided, automatically inserted into the cylinder, automatically covered and pre-tightened; and the requirement that the sub-station set fit rate be ≥99%.

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