Engine frame welding tooling

Abstract

The application discloses an engine frame welding tool, and relates to the technical field of welding tools, which comprises a fixing table, a support frame is fixed on the fixing table, the support frame is fixed with a supporting plate, a cross beam is placed on the fixing table, a longitudinal beam is placed on the supporting plate, a first limiting mechanism for positioning the cross beam is fixed on the fixing table, a second limiting mechanism for positioning the longitudinal beam is fixed on the supporting plate, a pre-striking mechanism is further installed on the supporting plate, and the pre-striking mechanism is used for pre-striking the welding position of the longitudinal beam and the cross beam to prevent deformation. The engine frame welding tool is provided with limiting plates on the fixing table and the supporting plate, and is matched with the first limiting mechanism and the second limiting mechanism, so that the cross beam and the longitudinal beam are respectively limited in multiple directions, such as up and down, left and right, and front and back, to ensure that the cross beam and the longitudinal beam do not deviate during welding, the alignment accuracy of the welding interface is remarkably improved, and the assembly accuracy and the structural stability of the engine frame are ensured.

Description

Technical Field

[0001] This invention relates to the field of welding tooling technology, specifically to a welding tooling for an engine frame. Background Technology

[0002] As the core load-bearing component of an engine, the structural stability and dimensional accuracy of the engine frame directly determine the assembly precision and operational safety of the engine. Welding is a crucial step in the engine frame manufacturing process, and positioning accuracy and deformation control during welding are key to ensuring frame quality. Currently, most existing engine frame welding fixtures use simple limiting blocks or pressure plates, which can only achieve single-directional positioning of the crossbeams and longitudinal beams. They cannot provide multi-directional precise positioning of the crossbeams and longitudinal beams, leading to easy displacement of the crossbeams and longitudinal beams during welding, resulting in positioning deviations. This, in turn, affects the alignment accuracy of the welding joints and reduces the overall assembly precision of the engine frame.

[0003] Meanwhile, existing welding fixtures lack effective pre-extension anti-deformation mechanisms. When welding the crossbeams and longitudinal beams of the engine frame, thermal stress is generated at the weld joint due to the high temperature of welding, which leads to shrinkage deformation of the welded part. The deformation is difficult to correct, which not only affects the dimensional accuracy of the frame, but may also cause defects such as cracks and incomplete welds at the weld joint, reducing the welding strength and structural stability, and failing to meet the high reliability requirements of the engine frame. Summary of the Invention

[0004] The purpose of this invention is to provide an engine frame welding fixture to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an engine frame welding fixture, including a fixed platform, a support frame fixed on the fixed platform, the support frame and a support plate being fixed to each other, a crossbeam placed on the fixed platform, a longitudinal beam placed on the support plate, a first limiting mechanism for positioning the crossbeam fixed on the fixed platform, a second limiting mechanism for positioning the longitudinal beam fixed on the support plate, and a pre-jacking mechanism installed on the support plate, the pre-jacking mechanism being used to pre-jacke the welding positions of the longitudinal beam and the crossbeam to resist deformation.

[0006] Preferably, limit plates are fixed on both the fixed platform and the support plate. The upper limit plate on the fixed platform contacts the crossbeam for positioning, and the upper limit plate on the support plate contacts the longitudinal beam for positioning. Through the function of the limit plates, a basic guarantee can be provided for the positioning of the crossbeam and the longitudinal beam, thereby ensuring the normal progress of subsequent welding.

[0007] Preferably, the first limiting mechanism includes a first bracket symmetrically fixed on the fixed platform, and a first cylinder is fixed on the first bracket. A first pressure plate is fixed at the output end of the first cylinder. The first pressure plate is located above the crossbeam. By extending and retracting the first cylinder, the first pressure plate can be driven to move. The first pressure plate can provide a basic guarantee for the clamping and positioning of the crossbeam.

[0008] Preferably, the first pressure plate is symmetrically fixed with first movable blocks on the left and right, and the first movable blocks are provided with first sliding grooves, which are composed of inclined grooves and vertical grooves. The first sliding groove is slidably connected to the first sliding rod, the first sliding rod is fixed to the first guide rod, and the first guide rod is slidably connected to the first bracket. The first guide rod is fixed to the first top plate. When the first pressure plate moves down, it drives the first movable blocks to move down simultaneously. With the sliding action between the first sliding groove and the first sliding rod, the first guide rod and the first top plate can be driven to move. With the sliding guiding action between the first guide rod and the first bracket, the stability of the movement of the first top plate can be ensured. The first top plate can realize the front and rear limiting and pressing effect of the crossbeam.

[0009] Preferably, the first top plate is also symmetrically fixed with a fixing frame, and the fixing frame and the round rod are slidably connected. The round rod and the toothed plate are fixed to each other. At the same time, a first spring is fixed between the toothed plate and the fixing frame. The movement of the first top plate can synchronously drive the fixing frame to move, thereby realizing the position adjustment of the toothed plate. When the toothed plate moves relative to the fixing frame, the sliding guide between the toothed plate and the fixing frame can ensure the stability of the movement of the toothed plate. Furthermore, the elasticity of the first spring can provide a basic force for the automatic reset of the toothed plate.

[0010] Preferably, the toothed plate and the locking block are engaged, and the locking block is fixed on the limiting block, which has an inclined structure. The limiting block and the crossbar are slidably connected. The crossbar is symmetrically fixed on the fixing platform, and a second spring is fixed between the limiting block and the fixing platform. The limiting block contacts the crossbeam for positioning. Through the action of the limiting block, the crossbeam can be limited to the left and right. Through the sliding action between the limiting block and the crossbar and the elastic action of the first spring, the crossbeam can be aligned centrally. Furthermore, in conjunction with the engaging action between the toothed plate and the locking block, the limiting block can be locked, thus ensuring the stability of the fixed crossbeam.

[0011] Preferably, the second limiting mechanism includes a second bracket fixed on the support plate, and a second cylinder is fixed on the second bracket. A second pressure plate is fixed at the output end of the second cylinder. The second pressure plate is located on the longitudinal beam. The second pressure plate can be moved by extending and retracting the second cylinder, thereby providing a basic guarantee for the vertical positioning of the longitudinal beam.

[0012] Preferably, the second pressure plate is fixed to one end of the connecting rod, and the connecting rod is slidably connected to the second bracket. The other end of the connecting rod is fixed to the second movable block. The second movable block is provided with a second sliding groove, which consists of an inclined groove and a vertical groove. The second sliding groove is slidably connected to the second sliding rod, and the second sliding rod is fixed to the second guide rod. The second guide rod is fixed to the second top plate, and the second guide rod is slidably connected to the second bracket. The movement of the second pressure plate can drive the connecting rod and the second movable block to move. Combined with the sliding action between the second sliding groove and the second sliding rod, the second guide rod and the second top plate can be moved, thereby providing a basic guarantee for the left and right positioning of the longitudinal beam.

[0013] Preferably, the pre-topping mechanism includes a support plate slidably connected within the support plate, and top rods are symmetrically fixed to the front and rear of the lower end face of the support plate, with the top rods slidably connected to the support plate. At the same time, a third spring is fixed between the support plate and the support plate. The upper end face of the support plate is higher than the upper end face of the support plate. When the support plate moves, the sliding guiding action between the top rods and the support plate can ensure the stability of the movement of the support plate. Furthermore, the elastic action of the third spring can provide a basic force for the automatic reset of the support plate.

[0014] Preferably, one end of the push rod contacts and slides against the lever, and the lever is rotatably connected to the mounting frame. A torsion spring connects the lever and the mounting frame. The mounting frame is symmetrically fixed to the lower end face of the support plate. The other end of the lever is rotatably connected to the slider, and the slider is slidably connected to the slide plate. The slide plate is fixed to one end of the support rod, and the support rod is slidably connected to the mounting frame. The other end of the support rod is fixed to the pre-top plate, and the upper end face of the pre-top plate is flush with the upper end face of the support plate and the fixed platform. By sliding the push rod downwards and contacting the lever, the lever can be rotated under force, causing the slider to slide within the slide plate and drive the slide plate upwards. This, in turn, synchronously drives the support rod and the pre-top plate to move upwards. The upward movement of the pre-top plate can pre-push the welding positions of the longitudinal beams and transverse beams, thereby resisting the deformation generated during the welding of the longitudinal beams and transverse beams and ensuring the welding quality of the longitudinal beams and transverse beams.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This engine frame welding fixture, through the limiting plates on the fixed platform and the support plate, in conjunction with the first limiting mechanism and the second limiting mechanism, achieves multi-directional limiting of the crossbeam and longitudinal beam in the up-down, left-right, and front-back directions. The first limiting mechanism drives the first pressure plate to move down through the first cylinder, which simultaneously drives the first top plate to push the crossbeam to fit with the limiting plate, thereby achieving the up-down and front-back positioning of the crossbeam. At the same time, the locking of the limiting block position is locked by the engagement of the toothed plate and the locking block. With the elastic action of the second spring, the crossbeam is centered in the left-right direction. The second limiting mechanism drives the second pressure plate to move down through the second cylinder, which drives the second top plate to engage with the limiting plate, thereby achieving the left-right and up-down positioning of the longitudinal beam. The multi-directional limiting structure ensures that the crossbeam and longitudinal beam do not shift during the welding process, significantly improving the alignment accuracy of the welding interface, and thus ensuring the assembly accuracy and structural stability of the engine frame. 2. The engine frame welding fixture, through a pre-jacking mechanism, can simultaneously pre-jacke the welding position of the crossbeam and longitudinal beam during the longitudinal beam clamping process to resist deformation. When the second pressure plate presses down on the longitudinal beam, the longitudinal beam drives the support plate to move down. Through the transmission action of the push rod, lever, slider, and slide plate, the pre-jacking plate is driven to move up, applying an upward force to the welding position, causing slight pre-deformation at the welding position. This pre-deformation can effectively offset the shrinkage deformation caused by high temperature thermal stress during the welding process, avoid defects such as cracks and incomplete welds in the weld joint, and at the same time ensure the dimensional accuracy of the frame after welding, greatly improving the welding quality and structural reliability. 3. The engine frame welding fixture features a flexible connection design for the limiting blocks in the first limiting mechanism. Under the elastic action of the second spring, the distance between the two limiting blocks can be flexibly adjusted, facilitating the quick insertion and initial positioning of the crossbeam. Combined with the engaging structure of the toothed plate and the locking block, the position of the limiting blocks can be reliably locked, preventing the crossbeam from shifting left or right during welding. This effectively solves the problems of inconvenient installation and easy damage to the workpiece associated with existing rigid limiting mechanisms, better meeting the actual usage requirements. Attached Figure Description

[0016] Figure 1 This is a frontal three-dimensional structural diagram of the overall composition of the device of the present invention; Figure 2 This is a bottom-view three-dimensional structural diagram of the overall composition of the device of the present invention; Figure 3 This is a frontal three-dimensional structural diagram of the first limiting mechanism of the present invention; Figure 4 This is a frontal three-dimensional structural diagram of the limiting block of the present invention; Figure 5 This is a frontal three-dimensional structural diagram of the second limiting mechanism of the present invention; Figure 6 This is a frontal three-dimensional structural diagram of the pre-top mechanism of the present invention; Figure 7This is a three-dimensional structural diagram of the slide plate of the present invention, viewed from below.

[0017] In the diagram: 1. Fixed platform; 2. Support frame; 3. Pallet; 4. Limiting plate; 5. Crossbeam; 6. Longitudinal beam; 7. First limiting mechanism; 701. First bracket; 702. First cylinder; 703. First pressure plate; 704. First movable block; 705. First slide groove; 706. First slide rod; 707. First guide rod; 708. First top plate; 709. Fixed frame; 710. Round rod; 711. Toothed plate; 712. First spring; 713. Locking block; 714. Limiting block; 715. Crossbar; 71 6. Second spring; 8. Second limiting mechanism; 801. Second bracket; 802. Second cylinder; 803. Second pressure plate; 804. Connecting rod; 805. Second movable block; 806. Second slide groove; 807. Second slide rod; 808. Second guide rod; 809. Second top plate; 9. Pre-topping mechanism; 901. Support plate; 902. Top rod; 903. Third spring; 904. Lever; 905. Mounting bracket; 906. Slider; 907. Slide groove plate; 908. Support rod; 909. Pre-topping plate. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figures 1-7 The present invention provides a technical solution: an engine frame welding fixture, including a fixed platform 1, a support frame 2 fixed on the fixed platform 1, the support frame 2 and the support plate 3 being fixed to each other, a crossbeam 5 placed on the fixed platform 1, a longitudinal beam 6 placed on the support plate 3, a first limiting mechanism 7 for positioning the crossbeam 5 fixed on the fixed platform 1, a second limiting mechanism 8 for positioning the longitudinal beam 6 fixed on the support plate 3, and a pre-jacking mechanism 9 also installed on the support plate 3, which is used to pre-jacke the welding positions of the longitudinal beam 6 and the crossbeam 5 to prevent deformation.

[0020] Limiting plates 4 are fixed on both the fixed platform 1 and the support plate 3. The upper limit plate 4 of the fixed platform 1 contacts the crossbeam 5 for positioning, and the upper limit plate 4 of the support plate 3 contacts the longitudinal beam 6 for positioning. The first limiting mechanism 7 includes a first bracket 701 symmetrically fixed on the fixed platform 1, and a first cylinder 702 is fixed on the first bracket 701. A first pressure plate 703 is fixed to the output end of the first cylinder 702, and the first pressure plate 703 is located above the crossbeam 5. A first movable block 704 is symmetrically fixed on the first pressure plate 703, and a first sliding groove 705 is provided on the first movable block 704. The first sliding groove 705 is composed of an inclined groove and a vertical groove. The first sliding groove 705 is slidably connected to the first sliding rod 706. The first sliding rod 706 is fixed on the first guide rod 707, and the first guide rod 707 is also fixed to the first guide rod 707. 07 is slidably connected to the first bracket 701, and the first guide rod 707 is fixed to the first top plate 708. The first top plate 708 is also symmetrically fixed with a fixing frame 709, and the fixing frame 709 is slidably connected to the round rod 710. The round rod 710 is fixed to the toothed plate 711, and the toothed plate 711 is fixed to the fixing frame 709 with a first spring 712. The toothed plate 711 is engaged with the locking block 713, and the locking block 713 is fixed to the limiting block 714. The limiting block 714 has an inclined structure, and the limiting block 714 is slidably connected to the crossbar 715. The crossbar 715 is symmetrically fixed to the fixing platform 1, and the limiting block 714 is fixed to the fixing platform 1 with a second spring 716. The limiting block 714 contacts the crossbeam 5 to achieve positioning. When using the welding fixture for this engine frame, such as Figures 1-7 As shown, the crossbeam 5 and the longitudinal beam 6 are first installed by placing the crossbeam 5 on the fixed platform 1 and the longitudinal beam 6 on the support plate 901. At this time, the longitudinal beam 6 is positioned by contacting the upper limit plate 4 of the support plate 3. When the crossbeam 5 is installed, the left and right limit blocks 714 can limit the crossbeam 5 to the left and right. At the same time, since the two limit blocks 714 are in a flexible connection state under the elastic action of the second spring 716, the distance between the two limit blocks 714 can be adjusted, making the installation of the crossbeam 5 more convenient. After the crossbeam 5 is installed, the second spring 716 generates left and right forces on the limit blocks 714 to limit the crossbeam 5, which can ensure that the crossbeam 5 is in the center position, thereby ensuring the accuracy of subsequent welding. When the crossbeam 5 is limited, the first cylinder 702 is extended, thereby driving the first pressure plate 703 to move downward. As the first pressure plate 703 moves downward, the first movable block 704 moves downward simultaneously. With the sliding action between the inclined groove on the first slide 705 and the first slide rod 706, the first guide rod 707 and the first top plate 708 can be moved by force. The first top plate 708 can push the crossbeam 5 to move. When the first slide rod 706 slides to the vertical groove on the first slide 705, the first top plate 708 makes the crossbeam 5 contact the upper limit plate 4 of the fixed platform 1 to achieve positioning. At this time, the longitudinal beam 6 can be positioned front and back by the contact between the two crossbeams 5 and the longitudinal beam 6. As the first cylinder 702 continues to extend, the first pressure plate 703 can continue to move downward until the first pressure plate 703 contacts the crossbeam 5, thereby achieving the vertical positioning of the crossbeam 5. When the first top plate 708 moves, the fixing frame 709 moves synchronously. The fixing frame 709 can move the toothed plate 711 towards the locking block 713 until the toothed plate 711 engages with the locking block 713, thereby locking the position of the limiting block 714 and limiting the left and right positions of the crossbeam 5. By limiting the crossbeam 5 in multiple directions, the stability of the crossbeam 5 can be guaranteed. The second limiting mechanism 8 includes a second bracket 801 fixed on the support plate 3, and a second cylinder 802 fixed on the second bracket 801. A second pressure plate 803 is fixed at the output end of the second cylinder 802. The second pressure plate 803 is located on the longitudinal beam 6. One end of the second pressure plate 803 is fixed to the connecting rod 804. The connecting rod 804 is slidably connected to the second bracket 801. The other end of the connecting rod 804 is fixed to the second movable block 805. A second sliding groove 806 is provided on the second movable block 805. The second sliding groove 806 is composed of an inclined groove and a vertical groove. The second sliding groove 806 is slidably connected to the second sliding rod 807. The second sliding rod 807 is fixed to the second guide rod 808. The second guide rod 808 is fixed to the second top plate 809. The second guide rod 808 is slidably connected to the second bracket 801. When fixing the longitudinal beam 6, such as Figures 1-7As shown, by controlling the extension of the second cylinder 802, the second pressure plate 803 and the connecting rod 804 can be moved downwards. With the sliding action between the connecting rod 804 and the second bracket 801, the stability of the downward movement of the second pressure plate 803 can be ensured. The downward movement of the connecting rod 804 can also drive the second movable block 805 to move downwards simultaneously. With the sliding action between the inclined groove on the second slide groove 806 and the second slide rod 807, the second guide rod 808 and the second top plate 809 can be moved. When the second slide rod 807 slides to the vertical groove on the second slide groove 806, the second top plate 809 and the upper limit plate 4 of the support plate 3 can achieve the left and right limit of the longitudinal beam 6. By continuing to extend the second cylinder 802, the second pressure plate 803 can continue to move downwards until the second pressure plate 803 and the support plate 3 cooperate to achieve the upper and lower limit of the longitudinal beam 6, thereby achieving multi-directional positioning of the longitudinal beam 6 and ensuring the stability of the fixed longitudinal beam 6. The pre-jacking mechanism 9 includes a support plate 901 slidably connected within the support plate 3, and push rods 902 are symmetrically fixed to the lower end face of the support plate 901. The push rods 902 are slidably connected to the support plate 3. A third spring 903 is fixed between the support plate 901 and the support plate 3. The upper end face of the support plate 901 is higher than the upper end face of the support plate 3. The push rods 902 slide in contact with one end of a lever 904, and the lever 904 is rotatably connected to a mounting bracket 905. The lever 904 and the mounting bracket 905... A torsion spring is connected between the two sides. The mounting bracket 905 is symmetrically fixed to the lower end face of the support plate 3. The other end of the lever 904 is rotatably connected to the slider 906. The slider 906 and the slide plate 907 are slidably connected. The slide plate 907 and one end of the support rod 908 are fixed to each other. The support rod 908 and the mounting bracket 905 are slidably connected. The other end of the support rod 908 is fixed to the pre-top plate 909. The upper end face of the pre-top plate 909 is flush with the upper end face of the support plate 3 and the fixed platform 1. When the second pressure plate 803 moves down to press the longitudinal beam 6, as Figures 1-7As shown, when the second pressure plate 803 contacts the longitudinal beam 6 and generates pressure, the longitudinal beam 6 simultaneously exerts a downward pressure force on the support plate 901. The support plate 901 then moves downward under this force, which in turn drives the push rod 902 to slide downward. The downward movement of the push rod 902 applies a force to one end of the lever 904, causing the lever 904 to swing. This, in turn, causes the slider 906 at the other end of the lever 904 to slide within the slide plate 907, generating an upward force on the slide plate 907. This causes the slide plate 907 to move upward under this force. This causes the support rod 908 and the pre-top plate 909 to move upward. The upward movement of the pre-top plate 909 can exert an upward force on the welding position of the longitudinal beam 6 and the transverse beam 5 until the upper surface of the support plate 901 moves down to be flush with the support plate 3. At this time, the action of the pre-top plate 909 can cause a slight pre-deformation at the welding position of the longitudinal beam 6 and the transverse beam 5. The pre-deformation at the welding position of the longitudinal beam 6 and the transverse beam 5 can effectively counteract the deformation during the welding process of the longitudinal beam 6 and the transverse beam 5, ensuring the welding quality of the longitudinal beam 6 and the transverse beam 5.

[0021] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0022] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only for the purpose of helping to understand the method and core ideas of the present invention. The above descriptions are only preferred embodiments of the present invention. It should be noted that due to the limitations of textual expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of the present invention.

Claims

1. A welding fixture for an engine frame, comprising a fixed platform (1), characterized in that: A support frame (2) is fixed on the fixed platform (1), and the support frame (2) is fixed to the pallet (3). A crossbeam (5) is placed on the fixed platform (1), and a longitudinal beam (6) is placed on the pallet (3). A first limiting mechanism (7) for positioning the crossbeam (5) is fixed on the fixed platform (1), and a second limiting mechanism (8) for positioning the longitudinal beam (6) is fixed on the pallet (3). A pre-jacking mechanism (9) is also installed on the pallet (3), and the pre-jacking mechanism (9) is used to pre-jacke the welding positions of the longitudinal beam (6) and the crossbeam (5) to resist deformation.

2. The engine frame welding fixture according to claim 1, characterized in that: Limiting plates (4) are fixed on both the fixed platform (1) and the pallet (3). The upper limit plate (4) of the fixed platform (1) contacts the crossbeam (5) to achieve positioning, and the upper limit plate (4) of the pallet (3) contacts the longitudinal beam (6) to achieve positioning.

3. The engine frame welding fixture according to claim 1, characterized in that: The first limiting mechanism (7) includes a first bracket (701) symmetrically fixed on the fixed platform (1), and a first cylinder (702) is fixed on the first bracket (701), and a first pressure plate (703) is fixed at the output end of the first cylinder (702), while the first pressure plate (703) is located above the crossbeam (5).

4. The engine frame welding fixture according to claim 3, characterized in that: The first pressure plate (703) is symmetrically fixed with a first movable block (704) on the left and right, and the first movable block (704) is provided with a first sliding groove (705), and the first sliding groove (705) is composed of an inclined groove and a vertical groove. The first sliding groove (705) is slidably connected to the first sliding rod (706). The first sliding rod (706) is fixed on the first guide rod (707), and the first guide rod (707) is slidably connected to the first bracket (701). The first guide rod (707) is fixed to the first top plate (708).

5. The engine frame welding fixture according to claim 4, characterized in that: The first top plate (708) is also symmetrically fixed with a fixing frame (709), and the fixing frame (709) and the round rod (710) are slidably connected. The round rod (710) and the toothed plate (711) are fixed to each other, and a first spring (712) is fixed between the toothed plate (711) and the fixing frame (709).

6. The engine frame welding fixture according to claim 5, characterized in that: The toothed plate (711) and the locking block (713) are engaged, and the locking block (713) is fixed on the limiting block (714). The limiting block (714) is a sloping structure. The limiting block (714) and the crossbar (715) are slidably connected. The crossbar (715) is symmetrically fixed on the fixed platform (1). A second spring (716) is fixed between the limiting block (714) and the fixed platform (1). The limiting block (714) contacts the crossbeam (5) to achieve positioning.

7. The engine frame welding fixture according to claim 1, characterized in that: The second limiting mechanism (8) includes a second bracket (801) fixed on the support plate (3), and a second cylinder (802) is fixed on the second bracket (801), and a second pressure plate (803) is fixed at the output end of the second cylinder (802), while the second pressure plate (803) is located on the longitudinal beam (6).

8. The engine frame welding fixture according to claim 7, characterized in that: The second pressure plate (803) is fixed to one end of the connecting rod (804), and the connecting rod (804) is slidably connected to the second bracket (801). The other end of the connecting rod (804) is fixed to the second movable block (805). The second movable block (805) is provided with a second sliding groove (806). The second sliding groove (806) is composed of an inclined groove and a vertical groove. The second sliding groove (806) is slidably connected to the second sliding rod (807). The second sliding rod (807) is fixed to the second guide rod (808). The second guide rod (808) is fixed to the second top plate (809). The second guide rod (808) is slidably connected to the second bracket (801).

9. The engine frame welding fixture according to claim 1, characterized in that: The pre-topping mechanism (9) includes a support plate (901) slidably connected in the tray (3), and a top rod (902) is symmetrically fixed on the front and back of the lower end face of the support plate (901), and the top rod (902) is slidably connected to the tray (3). At the same time, a third spring (903) is fixed between the support plate (901) and the tray (3). The upper end face of the support plate (901) is higher than the upper end face of the tray (3).

10. The engine frame welding fixture according to claim 9, characterized in that: The top rod (902) slides in contact with one end of the lever (904), and the lever (904) is rotatably connected to the mounting bracket (905). A torsion spring is connected between the lever (904) and the mounting bracket (905). The mounting bracket (905) is symmetrically fixed to the lower end face of the support plate (3). The other end of the lever (904) is rotatably connected to the slider (906). The slider (906) is slidably connected to the slide plate (907). The slide plate (907) is fixed to one end of the support rod (908). The support rod (908) is slidably connected to the mounting bracket (905). The other end of the support rod (908) is fixed to the pre-top plate (909). The upper end face of the pre-top plate (909) is flush with the upper end face of the support plate (3) and the fixed platform (1).

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