An engine block assembly line

Abstract

The application discloses an engine cylinder block assembly production line, which comprises a conveying line and a carrier plate part. A cylinder block testing part, a manual installation part, a tightening part, a laser marking part and a CNC part are sequentially arranged along the conveying line. The cylinder block testing part drives the cylinder block to sequentially pass through a first sealing test station and a second sealing test station by a rotating disc unit, and carries out water injection and pressure sealing test and camber sealing test respectively. The conveying line is composed of a flow line unit and a rotating table unit, and can realize turning and turning back arrangement. The carrier plate part is provided with a blocking unit and a jacking unit, and is used for accurate positioning of a workpiece after the workpiece is positioned. The tightening part drives a tightening motor to automatically lock a screw through an XYZ three-coordinate moving platform. A material removing line unit is arranged behind each station, and is used for automatic diversion of unqualified products. The application integrates sealing test, automatic tightening, marking and CNC machining functions, realizes full-automatic conveying and detection of cylinder block assembly, has high test precision, and effectively improves production efficiency and a good product rate.

Description

Technical Field

[0001] This invention belongs to the field of automated production technology, and in particular relates to an engine cylinder block assembly production line. Background Technology

[0002] The engine block is a key component of an internal combustion engine, and its assembly quality directly affects the engine's performance and reliability. Cylinder block assembly involves multiple processes, including sealing tests, parts installation, screw tightening, laser marking, and CNC precision machining. Traditional production methods often employ decentralized single-machine operations or semi-automatic assembly lines, relying on manual handling and positioning between processes. This presents the following problems: 1) Sealing tests are typically performed using separate equipment. Transferring the cylinder block between different testing stations requires multiple clamping operations, easily leading to positioning errors and affecting test accuracy; 2) Screw tightening often uses handheld tightening guns, resulting in inconsistent tightening torque and a tendency for missed tightening or stripped threads; 3) The production line lacks effective carrier plate conveying and blocking lifting mechanisms between stations, leading to unstable workpiece positioning during transit and hindering automated, precise assembly; 4) When the production line is long, a linear layout occupies a large amount of space, and defective products cannot be automatically rejected, easily mixing into subsequent stations and causing waste. Therefore, a modular assembly line is needed that integrates sealing testing, automatic tightening, marking and processing functions, and can realize automatic workpiece feeding, precise positioning and defective product screening. Summary of the Invention

[0003] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: An engine block assembly production line includes a conveyor line and a carrier plate section for transportation, on which engine parts are placed. Along the conveyor line are sequentially arranged a block testing section, a manual installation section, a tightening section for screw tightening, a laser marking section, and a CNC section.

[0004] The cylinder block testing unit includes a testing frame and a rotating disk unit, a first sealing test station, and a second sealing test station mounted on the testing frame. The rotating disk unit is rotatably connected to the testing frame, and the rotating disk unit drives engine parts to sequentially pass through the first sealing test station and the second sealing test station for sealing tests.

[0005] The carrier plate section includes several sets of carrier plates that slide on the conveyor line, several sets of blocking units to prevent the carrier plates from moving forward, and several sets of lifting units. When a blocking unit blocks a carrier plate, the lifting unit drives the carrier plate away from or towards the conveyor line.

[0006] The tightening part includes a tightening frame and a tightening unit and a balancer unit mounted on the tightening frame. The tightening unit is used to tighten several sets of screws on engine parts.

[0007] Furthermore, the rotating disk unit includes a drive arm fixed on the test frame, the output end of the drive arm is connected to the turntable, the turntable is provided with several sets of storage positions, and the drive arm drives the turntable to rotate to cyclically switch different storage positions.

[0008] Furthermore, the first sealing test station includes a first drive element fixed on the test frame and several sets of sealing elements. The output end of the first drive element is connected to a first top plate. The first top plate drives the engine parts in the storage position to move closer to or away from the sealing elements. It also includes a water injection element fixed on the test frame. When the first top plate drives the engine parts to move closer to the sealing elements, the sealing elements seal the channel opening, and the water injection element injects high-pressure water to test the sealing performance of the engine cylinder block.

[0009] Furthermore, the second sealing test station includes a second drive element fixed on the test frame and several sets of arc-shaped sealing elements. The output end of the second drive element is connected to a second top plate. The second top plate drives the engine parts in the storage position to approach or move away from the arc-shaped sealing elements. When the second top plate drives the engine parts to approach the arc-shaped sealing elements, the arc-shaped sealing elements are engaged with the engine parts to test the arc-shaped sealing performance of the engine cylinder.

[0010] Furthermore, the cylinder block testing unit also includes a first robotic arm unit for transporting engine parts from the carrier plate to the rotating disk unit. The first robotic arm unit includes a robotic arm and a mechanical mounting plate mounted on the output end of the robotic arm. Several sets of third drive elements are mounted on the mechanical mounting plate. The output end of each third drive element is provided with a pawl, and the third drive element drives the pawl to hook or detach from the engine parts.

[0011] Furthermore, the blocking unit includes a fourth drive element mounted on the conveyor line and a blocking plate mounted on the output end of the fourth drive element. The fourth drive element drives the blocking plate to extend or retract from the conveyor line to block or release the movement of the engine parts.

[0012] Furthermore, the lifting unit includes a lifting frame fixed on the conveyor line and a fifth drive element mounted on the lifting frame. The output end of the fifth drive element is provided with a lifting plate, and the fifth drive element controls the lifting plate to drive the engine parts away from or closer to the conveyor line.

[0013] Furthermore, the tightening unit includes a sixth driving element mounted on the tightening frame, a seventh driving element mounted on the sixth driving element, and an eighth driving element mounted on the output end of the seventh driving element. The three sets of driving elements form an XYZ three-coordinate moving platform. The output end of the eighth driving element is equipped with a tightening motor. The XYZ three-coordinate moving platform drives the tightening motor to perform three-coordinate movement.

[0014] Furthermore, the conveyor line includes several sets of assembly line units and several sets of turntable units for switching transport directions. Each assembly line unit includes a conveyor frame and several sets of rotating shafts rotatably connected to the conveyor frame. These rotating shafts are connected rearward via chains. A ninth drive element is provided on the conveyor frame, which drives the rotating shafts to rotate. Each turntable unit includes a turntable frame and a tenth drive unit mounted on the turntable frame. A turntable is fixed to the output end of the tenth drive unit, and assembly line units are mounted on the turntable. The turntable drives the assembly line units to rotate at multiple angles.

[0015] The beneficial effects of this invention are: 1. High testing accuracy and efficiency: The cylinder testing unit uses a rotating disc unit. The drive arm drives the disc to rotate, causing the cylinder to pass sequentially through the first and second sealing test stations. In the first sealing test station, the first drive element drives the first top plate to push the cylinder towards the sealing element. After the sealing element closes the channel opening, the water injection element injects high-pressure water to test the cylinder's planar sealing performance. In the second sealing test station, the second drive element drives the second top plate to push the cylinder towards the arc-shaped sealing element. The arc-shaped sealing element engages with the corresponding position on the cylinder to test the arc-shaped sealing performance. Through the cyclic switching of the rotating disc unit, two sealing tests can be completed without repeated clamping, improving testing efficiency and positioning consistency.

[0016] 2. Reliable Tightening Quality: The tightening unit includes a tightening module and a balancer unit. The tightening module uses the sixth, seventh, and eighth drive elements to form an XYZ three-axis moving platform, which can drive the tightening motor to precisely move to each screw hole. The balancer unit is used to balance the weight of the tightening gun, reducing the operator's workload (if manual assistance is required) or ensuring force control accuracy during automatic tightening. Compared to hand tightening, this structure ensures that the tightening torque of each screw is consistent, avoiding missed tightening or over-tightening.

[0017] 3. Precise Conveying and Positioning, Flexible Line Layout: The conveyor line consists of several assembly line units and turntable units. The assembly line units are driven to rotate via a ninth drive element, and the turntable units are driven by a tenth drive unit to rotate the assembly line units at multiple angles, allowing for changes in conveying direction and enabling the production line to be arranged in a reversible manner, saving workshop space. The carrier plate section is equipped with a blocking unit and a lifting unit: a fourth drive element drives a blocking plate to extend and block the carrier plate, and a fifth drive element drives a lifting plate to lift the carrier plate away from the conveyor line, ensuring stable positioning of the workpiece at each station. A second robotic arm unit can transfer the carrier plate between different conveyor line segments, further shortening the line length. Through the cooperation of the turntable, lifting, blocking, and robotic arm, smooth workpiece conveying and precise positioning are achieved.

[0018] 4. Automatic rejection of defective products to ensure high yield: Several rejection line units are installed between conveyor lines, arranged after each workstation. When a workstation completes its work and is determined to be defective by inspection, the control system controls the turntable unit to turn the carrier plate towards the rejection line unit, allowing the defective workpiece to automatically flow out of the main line and avoid flowing into subsequent workstations, causing rework or waste. Combined with the blocking and lifting mechanism of the carrier plate section, defective products can be accurately separated, ensuring the overall yield rate of the production line. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the cylinder block testing section of the present invention; Figure 3 This is a schematic diagram of the cylinder test section of the present invention after the outer shell has been removed; Figure 4 This is a schematic diagram of the structure of the first robotic arm unit of the present invention; Figure 5 This is a schematic diagram of the rotating disk unit structure of the present invention; Figure 6 This is a schematic diagram of the first sealing test station structure of the present invention; Figure 7 This is a schematic diagram of the first sealing test station structure of the present invention; Figure 8 This is a schematic diagram of the second sealing test station structure of the present invention; Figure 9 This is a schematic diagram of the second sealing test station structure of the present invention; Figure 10 This is the present invention. Figure 9 A magnified view of part A; Figure 11 This is a schematic diagram of the carrier plate structure of the present invention; Figure 12 This is a schematic diagram of the lifting unit structure of the present invention; Figure 13 This is a schematic diagram of the tightening part structure of the present invention; Figure 14 This is a schematic diagram of the preprocessing unit structure of the present invention; Figure 15 This is a schematic diagram of the tightening part of the present invention after the outer shell is removed; Figure 16This is a schematic diagram of the tightening unit structure of the present invention; Figure 17 This is a schematic diagram of the tightening unit structure of the present invention; Figure 18 This is a schematic diagram of the assembly line unit structure of the present invention; Figure 19 This is a schematic diagram of the turntable unit structure of the present invention; Explanation of reference numerals in the attached figures: 100. Conveyor line; 110. Assembly line unit; 111. Conveyor frame; 112. Rotary shaft; 113. Ninth drive element; 120. Turntable unit; 121. Turntable frame; 122. Tenth drive unit; 123. Turntable; 200. Cylinder testing section; 210. Testing frame; 220. Rotary disk unit; 221. Drive arm; 222. Turntable; 223. Storage position; 230. First sealing test station; 231. First drive element; 232. First top plate; 233. Water injection element; 234. Sealing element; 240. Second sealing test station; 241. Second drive element; 242. Second top plate; 243. Arc-shaped sealing element; 250. First robotic arm unit; 251. Robotic arm; 252. Mechanical safety device 253. Loading plate; 254. Third drive element; 300. Hook; 310. Carrier plate section; 311. Blocking unit; 312. Blocking plate; 320. Lifting unit; 321. Lifting frame; 322. Fifth drive element; 323. Lifting plate; 400. Removal line unit; 500. Handling section; 600. Manual installation section; 610. Pre-processing unit; 611. Pre-processing frame; 612. Press; 620. Installation unit; 700. Tightening section; 710. Tightening frame; 720. Tightening unit; 721. Sixth drive element; 722. Seventh drive element; 723. Eighth drive element; 724. Tightening motor; 730. Balancer unit; 800. Laser marking section; 900. CNC section. Detailed Implementation

[0021] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention. Specific implementation examples: like Figures 1 to 19 As shown, this embodiment provides an engine block assembly production line, including a conveyor line 100 and a carrier plate section 300 for transporting engine parts. Along the conveyor line 100 are sequentially arranged a block testing section 200, a manual installation section 600, a tightening section 700, a laser marking section 800, and a CNC section 900.

[0023] Conveyor line and carrier plate section The conveyor line 100 consists of several sets of assembly line units 110 and several sets of turntable units 120 for switching transport directions. Each assembly line unit 110 includes a conveyor frame 111 and several sets of rotating shafts 112 rotatably connected to the conveyor frame 111. Adjacent rotating shafts 112 are connected via chain drive. A ninth drive element 113 is mounted on the conveyor frame 111. The ninth drive element 113 is an AC geared motor with a rated power of 0.75kW and an output speed of 30rpm, used to drive all rotating shafts 112 to rotate synchronously, thereby moving the carrier plate section 300 forward. The turntable unit 120 includes a turntable frame 121 and a tenth drive unit 122 mounted on the turntable frame 121. The tenth drive unit 122 is a servo rotary platform with a rated torque of 50N·m and a rotation angle that can be arbitrarily set within the range of 0° to 180°. The output end of the tenth drive unit 122 is fixed with a turntable 123. An independent conveyor unit 110 is installed on the turntable 123. When the carrier plate moves to the turntable 123, the tenth drive unit 122 can drive the turntable 123 to rotate the conveyor unit 110, thereby changing the conveying direction and allowing the production line to be arranged according to the workshop layout, effectively saving space.

[0024] The carrier plate section 300 includes several sets of carrier plates (not individually labeled in the figure) that slide on the conveyor line 100, as well as several sets of blocking units 310 and several sets of lifting units 320. The blocking unit 310 includes a fourth drive element 311 mounted on the conveyor line 100 and a blocking plate 312 mounted on the output end of the fourth drive element 311. The fourth drive element 311 is a single-rod cylinder with a cylinder diameter of 20mm, a stroke of 25mm, and a working pressure of 0.4–0.6MPa. It can drive the blocking plate 312 to extend upwards beyond the surface of the conveyor line 100 to block the carrier plate from advancing, or to retract downwards to release the carrier plate. The lifting unit 320 includes a lifting frame 321 fixed on the conveyor line 100 and a fifth drive element 322 mounted on the lifting frame 321. The fifth drive element 322 is a double-rod cylinder with a cylinder diameter of 25mm, a stroke of 30mm, and a working pressure of 0.4–0.6MPa. The fifth drive element 322 has a lifting plate 323 at its output end. When the blocking unit 310 blocks the carrier plate, the fifth drive element 322 drives the lifting plate 323 to lift the carrier plate upward, so that the carrier plate is separated from the rotating shaft 112 of the conveyor line 100, ensuring that the workpiece is stably positioned at the work station. After the operation is completed, the lifting plate 323 descends and the carrier plate falls back into the conveyor line 100 to continue to flow forward.

[0025] Cylinder block testing section The cylinder block testing unit 200 includes a testing frame 210 and a rotating disk unit 220, a first sealing test station 230, a second sealing test station 240, and a first robotic arm unit 250 mounted on the testing frame 210.

[0026] The first robotic arm unit 250 is used to transport the engine block from the carrier plate 300 to the rotary table unit 220. The first robotic arm unit 250 includes a six-axis industrial robotic arm 251, the output end of which is equipped with a mechanical mounting plate 252. Two sets of third drive elements 253 are mounted on the mechanical mounting plate 252. The third drive elements 253 are small pneumatic fingers with a cylinder diameter of 10 mm and a stroke of 8 mm. Each pneumatic finger is equipped with a hook 254 at its output end. When the robotic arm 251 moves above the engine block on the carrier plate, the third drive elements 253 drive the hooks 254 to hook inward onto a specific process hole in the engine block. Then the robotic arm lifts the engine block and transfers it to the storage position 223 of the rotary table unit 220. Subsequently, the hooks 254 are released.

[0027] The rotating disk unit 220 includes a drive arm 221 fixed on the test frame 210. The drive arm 221 is a cam divider with adjustable input speed, and its output end is connected to the turntable 222. The turntable 222 has six evenly spaced storage positions 223, each capable of holding one cylinder. The drive arm 221 drives the turntable 222 to rotate intermittently, rotating 60° each time, causing the cylinder to pass sequentially through the first sealing test station 230 and the second sealing test station 240. Multiple sets of the first sealing test station 230 and the second sealing test station 240 can be configured according to the number of storage positions 223.

[0028] The first sealing test station 230 is used to test the sealing performance of the cylinder body. This station includes a first drive element 231 fixed on the test frame 210, several sets of sealing elements 234, and a water injection element 233. The first drive element 231 is a booster cylinder with a cylinder diameter of 50mm, a stroke of 40mm, and a working pressure of 0.5-0.7MPa. Its output end is connected to a first top plate 232. When the turntable 222 delivers a cylinder body to the first sealing test station 230, the first drive element 231 pushes the first top plate 232 to push the cylinder body towards the sealing element 234. The sealing element 234 is a silicone sealing ring, which, after being pressed, seals the water passage of the cylinder body. Subsequently, the water injection element 233 injects high-pressure water of 0.3MPa into the water passage through the pipeline, maintains the pressure for 15 seconds, and detects the pressure drop value through a pressure sensor to determine whether the sealing performance is qualified.

[0029] The second sealing test station 240 is used to test the arc surface sealing performance of the cylinder body. This station includes a second drive element 241 fixed on the test frame 210 and several sets of arc surface sealing elements 243. The second drive element 241 is also a booster cylinder with a cylinder diameter of 50mm, a stroke of 35mm, and a working pressure of 0.5-0.7MPa. Its output end is connected to a second top plate 242. The arc surface sealing element 243 is a contoured rubber part, the shape of which matches the arc sealing surface of the cylinder body. When the turntable 222 delivers the cylinder body to the second sealing test station 240, the second drive element 241 pushes the second top plate 242 to push the cylinder body towards the arc surface sealing element 243, so that the arc surface sealing element 243 is engaged in the arc surface groove of the cylinder body. After applying a certain pressure, the leakage is measured by an air tightness tester to determine the arc surface sealing performance. After the two sealing tests are completed, the first robotic arm unit 250 removes the qualified cylinder body from the turntable 222 and places it back on the carrier plate of the conveyor line 100.

[0030] Manual installation department The manual installation unit 600 includes a pre-treatment unit 610 and an installation unit 620 mounted on the conveyor line 100. The pre-treatment unit 610 includes a pre-treatment frame 611 and a press 612 housed within the frame. The press 612 is a C-type hydraulic press with a nominal pressure of 5 tons. The operator places the parts to be installed (such as valve guides, spring seats, etc.) into the tooling of the press 612, which then presses them into the corresponding pre-drilled holes in the cylinder body. After pre-treatment, the operator places the assembled parts into the installation unit 620 area on the conveyor line 100 and manually assembles them with the cylinder body. This station also has a blocking unit 310 and a lifting unit 320 to ensure the cylinder body remains fixed during installation.

[0031] Tightening part The tightening unit 700 includes a tightening frame 710 and a tightening unit 720 and a balancer unit 730 mounted on the tightening frame 710. The tightening unit 720 includes a sixth drive element 721 mounted on the tightening frame 710, a seventh drive element 722 mounted on the sixth drive element 721, and an eighth drive element 723 mounted on the output end of the seventh drive element 722. The sixth, seventh, and eighth drive elements are all linear modules, corresponding to the X, Y, and Z directions respectively: X-axis module travel 600mm, Y-axis module travel 400mm, and Z-axis module travel 200mm, all driven by servo motors with a repeatability accuracy of ±0.02mm. A tightening motor 724 is mounted on the output end of the eighth drive element 723. The tightening motor 724 is an electric tightening shaft with a torque range of 5–30 N·m and a speed of 1000 rpm. The XY-axis module moves the tightening motor 724 directly above the screw holes on the cylinder body, while the Z-axis module drives the tightening motor 724 downwards, completing the automatic tightening of the screws. The balancer unit 730 is a set of spring balancers, which suspend the tightening gun via a steel wire rope or are used to balance the Z-axis load, ensuring the stability of force control during the tightening process. In this embodiment, the tightening unit can simultaneously or sequentially tighten 12 screws on the cylinder body, with the tightening torque deviation of each screw controlled within ±3%.

[0032] Laser marking department and CNC department The laser marking unit 800 includes a marking frame (not shown in the figure) and a marking machine set inside the marking frame. The marking machine is a fiber laser marking machine with a power of 20W. After the cylinder enters the station with the carrier plate and is positioned, the marking machine engraves a QR code containing information such as model, production date, and serial number at a designated position on the cylinder, forming a unique identification code for subsequent quality traceability.

[0033] The CNC section 900 is a small vertical machining center with a spindle speed of 24,000 rpm and a positioning accuracy of ±0.01 mm. It is used for high-precision milling of some sealing surfaces or mating surfaces of cylinder blocks to remove burrs or ensure flatness requirements. The CNC section is equipped with an automatic fixture. After the carrier plate enters, it is lifted and positioned, and the machining is completed automatically by the CNC system.

[0034] Material removal line and handling department Several sets of rejection line units 400 are also provided between conveyor lines 100. Each main station (such as the cylinder testing section, tightening section, CNC section, etc.) is equipped with a rejection line unit. The structure of the rejection line unit 400 is the same as that of the assembly line unit 110, but its entrance is controlled by the turntable unit 120. When a cylinder is determined to be unqualified at a certain station, the control system controls the turntable unit 120 to turn and introduce the carrier plate into the rejection line unit 400. The unqualified workpiece automatically flows out of the main line, is collected and processed centrally, and is prevented from being mixed into subsequent stations.

[0035] In addition, due to the long production line and the adoption of a reversible layout, a handling unit 500 is also set up between conveyor lines 100. The handling unit 500 is a second robotic arm unit, using a four-axis SCARA robotic arm with an arm length of 1000mm and a load capacity of 20kg. This robotic arm picks up the carrier plate from the end of one production line, crosses the turntable or manual passage, and places it at the beginning of another production line, realizing line reversal and space saving.

[0036] Workflow Summary The engine block is first carried by the carrier plate section 300 and flows sequentially along the conveyor line 100. Upon reaching the cylinder block testing section 200, the blocking unit 310 and the lifting unit 320 fix the carrier plate, and the first robotic arm unit 250 transports the cylinder block to the rotating plate unit 220, where it undergoes both planar sealing and arc sealing tests. Qualified products are returned to the carrier plate. The carrier plate then continues to the manual installation section 600, where operators install the pre-treated parts onto the cylinder block. Next, it enters the tightening section 700, where the tightening unit 720 automatically tightens all screws. Afterward, it passes through the laser marking section 800 to engrave QR codes, and finally enters the CNC section 900 for precision machining. Each station has an inspection and rejection branch to ensure that only qualified products flow to the next station. The entire production line is controlled by a PLC, with each robotic arm, cylinder, servo module, tightening shaft, marking machine, and machining center working collaboratively. The production cycle is approximately 120 seconds per piece.

[0037] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. An engine block assembly production line, comprising a conveyor line (100) and a carrier plate section (300) for transport, wherein engine parts are placed on the carrier plate section (300), characterized in that: Along the conveyor line (100), there are sequentially arranged cylinder testing section (200), manual installation section (600), tightening section (700) for tightening screws, laser marking section (800) and CNC section (900). The cylinder block testing unit (200) includes a testing frame (210) and a rotating disk unit (220), a first sealing test station (230), and a second sealing test station (240) mounted on the testing frame (210). The rotating disk unit (220) is rotatably connected to the testing frame (210). The rotating disk unit (220) drives the engine parts to pass through the first sealing test station (230) and the second sealing test station (240) in sequence for sealing tests. The first sealing test station (230) includes a first drive element (231) fixed on the test frame (210) and several sets of sealing elements (234). The output end of the first drive element (231) is connected to a first top plate (232). The first top plate (232) drives the engine parts in the storage position (223) to approach / move away from the sealing elements (234). It also includes a water injection element (233) fixed on the test frame (210). When the first top plate (232) drives the engine parts to approach the sealing elements (234), the sealing elements (234) seal the channel opening, and the water injection element (233) injects high-pressure water to test the sealing performance of the engine cylinder. The second sealing test station (240) includes a second drive element (241) fixed on the test frame (210) and several sets of arc surface sealing elements (243). The output end of the second drive element (241) is connected to a second top plate (242). The second top plate (242) drives the engine parts in the storage position (223) to approach / move away from the arc surface sealing elements (243). When the second top plate (242) drives the engine parts to approach the arc surface sealing elements (243), the arc surface sealing elements (243) are inserted into the engine parts to test the arc surface sealing performance of the engine cylinder. The carrier plate section (300) includes several sets of carrier plates that slide on the conveyor line (100), several sets of blocking units (310) that prevent the carrier plates from moving forward, and several sets of lifting units (320). When the blocking unit (310) blocks the carrier plate, the lifting unit (320) drives the carrier plate away from / closer to the conveyor line (100). The tightening part (700) includes a tightening frame (710) and a tightening unit (720) and a balancer unit (730) mounted on the tightening frame (710). The tightening unit (720) is used to tighten several sets of screws on engine parts.

2. The engine block assembly production line according to claim 1, characterized in that: The rotating disk unit (220) includes a drive arm (221) fixed on the test frame (210). The output end of the drive arm (221) is connected to the turntable (222). The turntable (222) is provided with several sets of storage positions (223). The drive arm (221) drives the turntable (222) to rotate to cycle and switch between different storage positions (223).

3. The engine block assembly production line according to claim 1, characterized in that: The cylinder block testing unit (200) further includes a first robotic arm unit (250) for transporting engine parts from the carrier plate unit (300) to the rotating disk unit (220). The first robotic arm unit (250) includes a robotic arm (251) and a mechanical mounting plate (252) mounted on the output end of the robotic arm (251). Several sets of third drive elements (253) are mounted on the mechanical mounting plate (252). The output end of the third drive element (253) is provided with a pawl (254). The third drive element (253) drives the pawl (254) to hook / detach from the engine parts.

4. The engine block assembly production line according to claim 1, characterized in that: The blocking unit (310) includes a fourth drive element (311) mounted on the conveyor line (100) and a blocking plate (312) mounted on the output end of the fourth drive element (311). The fourth drive element (311) drives the blocking plate (312) to extend / retract from the conveyor line (100) to block / release the movement of engine parts.

5. The engine block assembly production line according to claim 1, characterized in that: The lifting unit (320) includes a lifting frame (321) fixed on the conveyor line (100) and a fifth drive element (322) mounted on the lifting frame (321). The output end of the fifth drive element (322) is provided with a lifting plate (323). The fifth drive element (322) controls the lifting plate (323) to drive the engine parts away from / close to the conveyor line (100).

6. The engine block assembly production line according to claim 1, characterized in that: The tightening unit (720) includes a sixth drive element (721) mounted on a tightening frame (710), a seventh drive element (722) mounted on the sixth drive element (721), and an eighth drive element (723) mounted on the output end of the seventh drive element (722). The three sets of drive elements form an XYZ three-coordinate moving platform. The output end of the eighth drive element (723) is provided with a tightening motor (724). The XYZ three-coordinate moving platform drives the tightening motor (724) to perform three-coordinate movement.

7. The engine block assembly production line according to claim 1, characterized in that: The conveyor line (100) includes several sets of assembly line units (110) and several sets of turntable units (120) for switching transport directions. The assembly line unit (110) includes a conveyor frame (111) and several sets of rotating shafts (112) rotatably connected to the conveyor frame (111). The several sets of rotating shafts (112) are connected backward by chains. The conveyor frame (111) is provided with a ninth driving element (113), which is used to drive the several sets of rotating shafts (112) to rotate.

8. The engine block assembly production line according to claim 7, characterized in that: The turntable unit (120) includes a turntable frame (121) and a tenth drive unit (122) mounted on the turntable frame (121). The output end of the tenth drive unit (122) is fixed with a turntable (123). A production line unit (110) is mounted on the turntable (123). The turntable (123) is used to drive the production line unit (110) to rotate at multiple angles.

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