An adjustable clamp for mounting a lawn mower engine assembly

Abstract

The present invention relates to the field of tooling and fixtures, and in particular to an adjustable fixture for installing a lawn mower engine assembly. It includes a workbench, an operating panel, an arc-shaped fixed clamp, an arc-shaped movable clamp, etc. The operating panel is installed on the workbench, the arc-shaped fixed clamp is installed on the workbench, and the arc-shaped movable clamp is rotatably installed on the workbench. The present invention can clamp and fix the piston body through the coordination of the arc-shaped fixed clamp, the arc-shaped movable clamp, the arc-shaped rotating block, the arc-shaped rubber plate, the sleeve, the pressure ring, the pre-pressing mechanism, the opening and closing mechanism, and the rotating mechanism, and then the piston ring can be pressed down into the groove of the piston body so that the piston ring is stuck in the groove of the piston body, thereby automatically completing the installation of the piston ring, and the opening direction of the piston ring can be automatically changed by rotation to prevent the opening of the piston ring from leaking in the same straight line. It is not only simple to operate, time-saving and labor-saving, but also can prevent the piston ring from being damaged and avoid material waste.

Description

Technical Field

[0001] The invention relates to the field of tooling fixtures, and in particular to an adjustable fixture for installing a lawn mower engine component. Background Art

[0002] In modern agricultural machinery, efficient and precise operating tools are one of the key factors in improving agricultural production efficiency. As an indispensable equipment in farmland management, the performance of the weeder is directly related to the quality of the crop growth environment and the labor intensity of farmers. With the advancement of agricultural technology and the improvement of the degree of automation, the design and manufacture of weeders are also constantly developing in a more intelligent and humanized direction. Among them, the engine is the core power source of the weeder, and its installation stability and accuracy are crucial to the operating efficiency and service life of the whole machine. Inside the engine, the piston is one of the core moving parts, and its assembly accuracy and efficiency directly affect the engine's performance, reliability and fuel economy.

[0003] At present, when assembling an engine, it is necessary to assemble the piston assembly inside the engine first. The piston assembly includes a piston body, piston rings (usually including air rings and oil rings), a piston pin and possible other accessories; in the process of installing the piston, the installation of the piston ring is the most troublesome, and the piston ring needs to be pried open, and then the piston ring is stuck into the groove, and then the piston ring is rotated manually to ensure that the opening of the piston ring is staggered at a certain angle as required to avoid the opening of the piston ring being in the same straight line, thereby causing leakage; however, the piston ring is easily damaged in the process of manually prying open the piston ring, resulting in material waste, and manually prying open and rotating the piston ring is not only troublesome to operate, but also inefficient. Summary of the invention

[0004] In view of this, the present invention provides an adjustable clamp for installing a lawn mower engine assembly, which can solve the shortcomings of manually breaking and rotating the piston ring during the installation of the piston, resulting in troublesome operation, low efficiency, and easy damage to the piston ring.

[0005] The technical implementation scheme of the present invention is: an adjustable clamp for installing a lawn mower engine component, including a workbench, and also including a control panel, an arc-shaped fixed clamp, an arc-shaped movable clamp, an arc-shaped rotating block, an arc-shaped rubber plate, a cylinder I, a connecting plate I, a sleeve, an electric push rod, a connecting plate II, a pressure ring, a pre-pressing mechanism, an opening and closing mechanism and a rotating mechanism. The control panel is installed on the workbench, the arc-shaped fixed clamp is installed on the workbench, the arc-shaped movable clamp is rotatably installed on the workbench, the arc-shaped fixed clamp and the arc-shaped movable clamp are both rotatably provided with an arc-shaped rotating block, and the arc-shaped rubber plate is connected to the arc-shaped rotating block. On the rotating block, the arc-shaped rubber plate is used to clamp the piston body, the cylinder I is installed on the workbench, the connecting plate I is connected to the telescopic rod of the cylinder I, the sleeve is connected to the connecting plate I, and the sleeve is used to feed the piston ring, the electric push rod is installed on the workbench, the connecting plate II is connected to the telescopic rod of the electric push rod, the pressure ring is connected to the connecting plate II, and the pressure ring is used to press the piston ring into the groove of the piston body, the pre-pressing mechanism is used to press one end of the piston ring in advance, the opening and closing mechanism is used to drive the arc-shaped movable clamp to rotate, and the rotating mechanism is used to drive the arc-shaped rotating block to rotate.

[0006] Further explanation: the pre-stressing mechanism includes a stopper, a pressure block and a spring I. The stopper is connected to the connecting plate I. The pressure block is slidably installed on the pressure ring. The pressure block contacts the stopper when it moves, and the pressure block is used to press down one end of the piston ring in advance. The two ends of the spring I are respectively connected to the pressure block and the pressure ring. A groove is opened on the pressure block, and the groove is used for the stopper to be inserted.

[0007] Further explanation: the opening and closing mechanism includes a cylinder II and an elliptical block. The cylinder II is installed on a workbench. The elliptical block is connected to the telescopic rod of the cylinder II. An elliptical hole is opened on the elliptical block. The arc-shaped movable clamp moves in the elliptical hole.

[0008] Further explanation: the rotating mechanism includes a connecting rod, a round rod and an arc-shaped rack. The connecting rod is connected to the pressure ring. Round rods are arranged at intervals on the connecting rod. Arc-shaped racks are rotatably arranged in the arc-shaped fixed clamp and the arc-shaped movable clamp. When the round rod moves, it contacts the arc-shaped rack.

[0009] Further description, the rotating mechanism also includes a tooth block, a torsion spring and a limit block. The tooth block is rotatably arranged on the arc-shaped rotating block on one side, the tooth block is meshed with the arc-shaped rack, and the two ends of the torsion spring are respectively connected to the tooth block and the arc-shaped rotating block on one side. The limit block is installed on the arc-shaped rotating block on the same side as the tooth block, and the limit block is used to limit the tooth block.

[0010] Further description, it also includes a supporting block, which is connected to the bottom end of the arc-shaped rotating block on the arc-shaped fixing clamp, and is used to support the piston body.

[0011] Further description, it also includes a resistance increasing mechanism, which includes a friction plate and a spring II. The friction plate is slidably arranged on the workbench, and the friction plate contacts the arc-shaped rotating block on the arc-shaped fixing clamp. The two ends of the spring II are respectively connected to the friction plate and the workbench.

[0012] Further description, it also includes a sensing mechanism, which includes a connecting plate III and a distance sensor. The connecting plate III is installed on the workbench, and the distance sensor is installed on the connecting plate III. The distance sensor is used to sense the distance between the connecting plate II.

[0013] The beneficial effects of the present invention are as follows: 1. The present invention can clamp and fix the piston body through the cooperation of the arc-shaped fixing clamp, the arc-shaped movable clamp, the arc-shaped rotating block, the arc-shaped rubber plate, the sleeve, the pressure ring, the pre-pressing mechanism, the opening and closing mechanism and the rotating mechanism, and then the piston ring can be pressed down into the groove of the piston body so that the piston ring is stuck in the groove of the piston body, thereby automatically completing the installation of the piston ring, and the opening direction of the piston ring can be automatically changed by rotation to prevent the opening of the piston ring from leaking in the same straight line. It is not only simple to operate, but also time-saving and labor-saving, and can prevent the piston ring from being damaged and avoid material waste.

[0014] 2. The present invention provides a resistance increasing mechanism, which enables the friction plate to use friction to hinder the arc-shaped rotating block from rotating, thereby preventing the arc-shaped rack from using friction to drive the tooth block and the arc-shaped rotating block to reverse, preventing the opening direction of the piston ring from changing, and preventing the opening of the piston ring from returning to the same straight line.

[0015] 3. The present invention can use the distance sensor to sense the distance between the connecting plate II by setting a sensing mechanism, so as to realize automatic control of the cylinder I to drive the connecting plate I and the sleeve to move upward for a certain distance, so that the bottom end of the sleeve is flush with the position where the piston ring needs to be installed in the groove of the piston body. In this way, there is no need for manual control, which is convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the invention.

[0017] Figure 2 The invention is a three-dimensional structural schematic diagram of an arc-shaped fixed clamp, an arc-shaped movable clamp and an arc-shaped rotating block.

[0018] Figure 3 This is a three-dimensional structural schematic diagram of loading the piston ring and the piston body according to the present invention.

[0019] Figure 4 It is a three-dimensional structural schematic diagram of the cylinder I, sleeve and electric push rod of the present invention.

[0020] Figure 5 It is a three-dimensional structural schematic diagram of the pre-pressing mechanism of the present invention.

[0021] Figure 6 It is a schematic diagram of the three-dimensional structure of the pressing block, spring I and groove of the present invention.

[0022] Figure 7 It is a three-dimensional structural schematic diagram of the opening and closing mechanism and the rotating mechanism of the present invention.

[0023] Figure 8 It is a three-dimensional structural schematic diagram of the arc-shaped rack, tooth block and limit block of the present invention.

[0024] Fig. 9 It is a schematic diagram of the three-dimensional structure of the tooth block, torsion spring and limit block of the present invention.

[0025] Fig.10 It is a schematic diagram of the three-dimensional structure of the supporting block and the resistance increasing mechanism of the present invention.

[0026] Fig.11 It is a schematic diagram of the three-dimensional structure of the connecting plate II, the pressure ring and the connecting plate III of the present invention.

[0027] Fig.12 It is a schematic diagram of the three-dimensional structure of the sensing mechanism of the present invention.

[0028] Markings in the accompanying drawings: 1: workbench, 101: piston ring, 102: piston body, 2: control panel, 3: arc-shaped fixing clamp, 4: arc-shaped movable clamp, 5: arc-shaped rotating block, 6: arc-shaped rubber plate, 7: cylinder I, 8: connecting plate I, 9: sleeve, 10: electric push rod, 11: connecting plate II, 12: pressure ring, 13: stopper, 14: pressure block, 15: spring I, 16: groove, 17: cylinder II, 18: elliptical block, 181: elliptical hole, 19: connecting rod, 20: round rod, 21: arc-shaped rack, 22: tooth block, 23: torsion spring, 24: limit block, 25: support block, 26: friction plate, 27: spring II, 28: connecting plate III, 29: distance sensor. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with specific embodiments. The illustrative embodiments and descriptions of the present invention are used to explain the present invention but are not intended to limit the present invention.

[0030] Embodiment: An adjustable clamp for mounting a lawn mower engine assembly, see Figure 1-Figure 9As shown, it includes a workbench 1; it also includes a control panel 2, an arc-shaped fixed clamp 3, an arc-shaped movable clamp 4, an arc-shaped rotating block 5, an arc-shaped rubber plate 6, a cylinder Ⅰ7, a connecting plate Ⅰ8, a sleeve 9, an electric push rod 10, a connecting plate Ⅱ11, a pressure ring 12, a pre-pressing mechanism, an opening and closing mechanism and a rotating mechanism; the control panel 2 is installed on the left front side of the workbench 1; two arc-shaped fixed clamps 3 are installed in the middle of the upper right side of the workbench 1, and the two arc-shaped fixed clamps 3 are distributed up and down; the arc-shaped movable clamp 4 is rotatably installed on the rear right side of the upper part of the workbench 1; arc-shaped rotating blocks 5 are rotatably arranged between the arc-shaped fixed clamps 3 and on the arc-shaped movable clamp 4, and the two arc-shaped rotating blocks 5 are in contact with each other; the two blocks The arc-shaped rubber plates 6 are respectively connected to the sides of the two arc-shaped rotating blocks 5 that are close to each other. The arc-shaped rubber plates 6 are used to clamp the piston body 102 to fix the piston body 102; the cylinder Ⅰ7 is installed at the front left side of the workbench 1, and the cylinder Ⅰ7 is electrically connected to the control panel 2; the connecting plate Ⅰ8 is connected to the telescopic rod of the cylinder Ⅰ7; the sleeve 9 is connected to the connecting plate Ⅰ8, and the sleeve 9 is divided into two parts, the upper part is truncated cone-shaped, and the lower part is cylindrical. By sleeve the piston ring 101 on the truncated cone-shaped outer wall of the upper part of the sleeve 9, the piston ring 101 can be loaded; the electric push rod 10 is installed at the rear left side of the workbench 1, and the electric push rod 10 is connected to the control panel 2 electrical connection; the connecting plate II 11 is connected to the telescopic rod of the electric push rod 10; the pressing ring 12 is connected to the connecting plate II 11, the inner diameter of the pressing ring 12 is larger than the outer diameter of the sleeve 9, so that the pressing ring 12 can pass through the outer wall of the sleeve 9 when it moves downward, and the outer diameter of the pressing ring 12 is smaller than the outer diameter of the piston ring 101, so that the pressing ring 12 can contact the piston ring 101 on the sleeve 9 when it moves downward, and the pressing ring 12 is used to press the piston ring 101 into the groove 16 of the piston body 102, so as to complete the installation of the piston ring 101; the pre-pressing mechanism is used to press one end of the piston ring 101 in advance, so that the piston ring 101 can be deformed when the piston ring 101 is expanded. The force applied is distributed to the entire piston ring 101, so as to prevent the piston ring 101 from applying the force applied to the entire deformation only to the middle position of the piston ring 101 when the piston ring 101 is deformed, causing the middle position of the piston ring 101 to be over-pressurized and unable to recover, thereby avoiding damage to the piston ring 101; the opening and closing mechanism is used to drive the arc-shaped movable clamp 4 to rotate, so that the arc-shaped movable clamp 4 drives the arc-shaped rubber plate 6 to clamp or release the piston body 102; the rotating mechanism is used to drive the arc-shaped rotating block 5 to rotate, thereby driving the piston ring 101 installed on the piston body 102 to rotate, thereby adjusting the direction of the opening of the piston ring 101 to avoid the opening of the piston ring 101 being in the same straight line.

[0031] See also Figure 5 and Figure 6As shown, the pre-stressing mechanism includes a stopper 13, a pressure block 14 and a spring Ⅰ15; the stopper 13 is connected to the connecting plate Ⅰ8, and the bottom end of the stopper 13 is flush with the bottom end of the sleeve 9; the pressure block 14 is slidably installed on the pressure ring 12, and the pressure block 14 will contact the stopper 13 when it moves downward, and the pressure block 14 is used to press down one end of the piston ring 101 in advance; the two ends of the spring Ⅰ15 are respectively connected to the pressure block 14 and the pressure ring 12; a groove 16 is opened on the pressure block 14, and the groove 16 is used for the stopper 13 to be clamped, and the height of the groove 16 is consistent with the height of the stopper 13. After the stopper 13 is clamped into the groove 16, the bottom end of the stopper 13 can be flush with the bottom end of the pressure block 14.

[0032] See also Figure 7 As shown, the opening and closing mechanism includes a cylinder II 17 and an elliptical block 18; the cylinder II 17 is installed on the upper rear side of the workbench 1, and the cylinder II 17 is electrically connected to the control panel 2; the elliptical block 18 is connected to the telescopic rod of the cylinder II 17, and an elliptical hole 181 is opened on the elliptical block 18. The arc-shaped movable clamp 4 moves in the elliptical hole 181. By moving the elliptical block 18 left and right, the elliptical block 18 can squeeze the arc-shaped movable clamp 4 to rotate forward and backward.

[0033] See also Figure 7-Figure 9 As shown, the rotating mechanism includes a connecting rod 19, a round rod 20, an arc-shaped rack 21, a tooth block 22, a torsion spring 23 and a limit block 24; the connecting rod 19 is connected to the pressure ring 12; three round rods 20 are arranged at intervals on the connecting rod 19; arc-shaped fixed clamps 3 and arc-shaped movable clamps 4 are both rotatably provided with arc-shaped racks 21, and the two arc-shaped racks 21 form an annular rack by contact, and the inner and outer sides of the arc-shaped rack 21 are provided with teeth, and the number of teeth on the outer side of the arc-shaped rack 21 is fifteen. When the round rod 20 moves downward, it contacts the teeth on the outer side of the arc-shaped rack 21; the tooth block 22 is rotatably arranged on the arc-shaped rotating block 5 in the arc-shaped movable clamp 4, and the tooth block 22 is engaged with the teeth on the inner side of the arc-shaped rack 21; the two ends of the torsion spring 23 are respectively connected to the tooth block 22 and the arc-shaped rotating block 5 in the arc-shaped movable clamp 4; the limit block 24 is installed on the arc-shaped rotating block 5 in the arc-shaped movable clamp 4, and the limit block 24 is used to limit the tooth block 22 so that the tooth block 22 can only rotate in one direction.

[0034] When in use, the control panel 2 controls the cylinder II 17 to drive the elliptical block 18 to move to the left, so that the elliptical block 18 squeezes the arc-shaped movable clamp 4 to rotate and open, thereby driving the arc-shaped rotating block 5 and the arc-shaped rubber plate 6 on the arc-shaped movable clamp 4 to rotate and open, and then the piston body 102 is placed in the arc-shaped rubber plate 6 on the arc-shaped fixed clamp 3, and then the control panel 2 controls the cylinder II 17 to drive the elliptical block 18 to move right and reset, so that the elliptical block 18 squeezes the arc-shaped movable clamp 4 to reverse and close, thereby driving the arc-shaped rotating block 5 and the arc-shaped rubber plate 6 on the arc-shaped movable clamp 4 to reverse and close, so that the two arc-shaped rubber plates 6 clamp the piston body 102, thereby the piston body 102 is After fixing, control cylinder Ⅰ7 is controlled by control panel 2 to drive connecting plate Ⅰ8 and sleeve 9 to move downward, so that the bottom end of sleeve 9 is flush with the position where piston ring 101 needs to be installed in the groove of piston body 102, and then a piston ring 101 is sleeved on sleeve 9 (when selecting piston ring 101 to be placed, it is necessary to select according to the installation order of piston ring 101 on piston body 102, and select according to the installation order from bottom to top, usually three oil rings are selected first, and then two gas rings are selected, and the five piston rings 101 are placed one at a time in sequence for installation), so that the loading of piston ring 101 and piston body 102 is completed (such as Figure 3 shown);

[0035] Then, the control panel 2 is used to control the electric push rod 10 to drive the connecting plate II 11 to move downward, thereby driving the pressure ring 12 and the pressure block 14 to move downward. When the pressure block 14 contacts the piston ring 101 on the sleeve 9, the pressure block 14 will squeeze one end of the piston ring 101, thereby pre-pressing one end of the piston ring 101 in advance. When the pressure ring 12 contacts the entire piston ring 101 on the sleeve 9, the pressure ring 12 will squeeze the entire piston ring 101 downward, so that the piston ring 101 gradually moves downward on the outer wall of the sleeve 9 (period). The piston ring 101 is squeezed by the outer wall of the sleeve 9, and the piston ring 101 will gradually expand and deform. At this time, because the pressure block 14 is used to pre-press one end of the piston ring 101 in advance, the piston ring 101 can distribute the force of the entire deformation to the entire piston ring 101 when expanding and deforming, so as to prevent the piston ring 101 from applying the force of the entire deformation only to the middle position of the piston ring 101 when expanding and deforming, causing the middle position of the piston ring 101 to be over-pressed and unable to recover, thereby avoiding damage to the piston ring 101 ), when the stopper 13 is inserted into the groove 16 in the pressure block 14, the bottom end of the pressure block 14 will gradually be flush with the bottom end of the stopper 13 and the bottom end of the sleeve 9, until the stopper 13 is completely inserted into the groove 16 in the pressure block 14, so that the bottom end of the pressure block 14 is flush with the bottom end of the stopper 13 and the bottom end of the sleeve 9. At this time, the pressure block 14 just presses one end of the piston ring 101 down to separate from the sleeve 9, so that one end of the piston ring 101 is restored and inserted into the groove of the piston body 102 (after the piston ring 101 after the expansion deformation is separated from the sleeve 9, the piston ring 101 will be restored), and then the stopper 13 will stop the pressing block 14 from moving downward, so that the pressing block 14 no longer presses one end of the piston ring 101 to move downward, and then when the pressing ring 12 continues to move downward, the spring I 15 is compressed until the pressing ring 12 presses the entire piston ring 101 down to be separated from the sleeve 9, so that the entire piston ring 101 is restored and stuck in the groove of the piston body 102, and then the piston ring 101 is installed in the groove of the piston body 102, so that the installation of the piston ring 101 can be automatically completed;

[0036] Then, the control panel 2 controls the electric push rod 10 to drive the connecting plate Ⅱ11 to move upward and reset, thereby driving the pressure ring 12 to move upward and reset. During this period, the spring Ⅰ15 gradually returns to its original state. When the spring Ⅰ15 returns to its original state, the pressure ring 12 will use the spring Ⅰ15 to pull the pressure block 14 to move upward and reset, so that the stopper 13 leaves the groove 16 of the pressure block 14. Then, the control panel 2 controls the cylinder Ⅰ7 to drive the connecting plate Ⅰ8 and the sleeve 9 to move upward for a distance, so that the bottom end of the sleeve 9 is flush with the position where the piston ring 101 needs to be installed in the groove of the piston body 102, and then the next piston ring 101 is installed. Put it on the sleeve 9, and repeat the above-mentioned piston ring 101 installation operation. In this way, the next piston ring 101 can be automatically installed. During the repetition of the above-mentioned operation; when the pressure ring 12 moves downward, the pressure ring 12 will drive the connecting rod 19 and the round rod 20 to move downward. When the three round rods 20 contact the outer teeth of the arc-shaped rack 21 in turn, the three round rods 20 will drive the arc-shaped rack 21 to rotate 72 degrees in total. At this time, the arc-shaped rack 21 will squeeze the tooth block 22 (during this period, the tooth block 22 cannot rotate because the limit block 24 limits the tooth block 22, so that the arc-shaped rack 21 can drive the tooth block 22 is rotated), so that the arc-shaped rack 21 drives the tooth block 22, the arc-shaped rotating block 5 and the arc-shaped rubber plate 6 to rotate 72 degrees, thereby driving the piston body 102 and the piston ring 101 thereon to rotate 72 degrees synchronously, thereby adjusting the opening direction of the piston ring 101; when the pressure ring 12 moves upward to reset, the pressure ring 12 will drive the connecting rod 19 and the round rod 20 to move upward to reset, and when the three round rods 20 contact the outer teeth of the arc-shaped rack 21 in turn, the three round rods 20 will drive the arc-shaped rack 21 to reverse 72 degrees in total, and at this time the arc-shaped rack 21 will squeeze the tooth block 22, causing the tooth block 22 to reverse , the torsion spring 23 is deformed, so that the arc-shaped rack 21 cannot drive the tooth block 22, the arc-shaped rotating block 5 and the arc-shaped rubber plate 6 to reverse by 72 degrees, so that the arc-shaped rotating block 5, the arc-shaped rubber plate 6, the piston body 102 and the piston ring 101 thereon will not reverse, thereby maintaining the opening direction of the piston ring 101. When the arc-shaped rack 21 stops squeezing the tooth block 22, the torsion spring 23 returns to its original state, and the torsion spring 23 drives the tooth block 22 to rotate and reset; in this way, the piston body 102 and the piston ring 101 thereon can be rotated by 72 degrees by resetting the pressure ring 12 upward each time after moving downward;

[0037] Then repeat the above operation again, and all five piston rings 101 can be automatically installed in the grooves of the piston body 102, and the openings of the five piston rings 101 are different (the angle between the openings of two adjacent piston rings 101 is exactly 72 degrees). After all five piston rings 101 are installed on the piston body 102, the cylinder I7 is controlled by the control panel 2 to drive the connecting plate I8 and the sleeve 9 to move upward and reset, and then the piston body 102 is held, and the cylinder II 17 is controlled by the control panel 2 again to drive the elliptical block 18 to move left, so that The elliptical block 18 squeezes the arc-shaped movable clamp 4 to rotate and open, thereby driving the arc-shaped rotating block 5 and the arc-shaped rubber plate 6 on the arc-shaped movable clamp 4 to rotate and open, and then the two arc-shaped rubber plates 6 loosen the piston body 102, and then the piston body 102 is taken out, and the cylinder II 17 is controlled by the control panel 2 again to drive the elliptical block 18 to move right and reset, so that the elliptical block 18 squeezes the arc-shaped movable clamp 4 to reverse and close, thereby driving the arc-shaped rotating block 5 and the arc-shaped rubber plate 6 on the arc-shaped movable clamp 4 to reverse and close, so that the unloading of the piston body 102 can be completed.

[0038] See also Fig.10 As shown, a supporting block 25 is also included; the supporting block 25 is connected to the bottom end of the arc-shaped rotating block 5 on the arc-shaped fixing clamp 3, and the supporting block 25 is used to support the piston body 102.

[0039] By providing the supporting block 25 , the supporting block 25 can support the piston body 102 clamped by the arc-shaped rubber plate 6 , thereby providing support for the piston body 102 to prevent the piston body 102 from falling.

[0040] See also Fig.10 As shown, a resistance increasing mechanism is also included, which includes a friction plate 26 and a spring II 27; the friction plate 26 is slidably arranged in the middle of the upper right side of the workbench 1, the friction plate 26 is located directly below the arc-shaped fixing clamp 3, and the friction plate 26 contacts the arc-shaped rotating block 5 between the arc-shaped fixing clamp 3, so that the friction plate 26 uses friction force to hinder the rotation of the arc-shaped rotating block 5; the two ends of the spring II 27 are respectively connected to the friction plate 26 and the workbench 1.

[0041] In the initial state, the arc-shaped rotating block 5 between the arc-shaped fixing clamps 3 squeezes the friction plate 26, so that the spring II 27 is in a compressed state; through the compression of the spring II 27, the spring II 27 can use the elastic force to squeeze the friction plate 26, so that the friction plate 26 is tightly attached to the arc-shaped rotating block 5 between the arc-shaped fixing clamps 3, thereby increasing the friction force between the arc-shaped rotating block 5, so that the friction plate 26 uses the friction force to hinder the arc-shaped rotating block 5 from reversing; when the arc-shaped rack 21 reverses, the arc-shaped rack 21 will squeeze the tooth block 22. At this time, the friction force between the friction plate 26 and the arc-shaped rotating block 5 is greater than the friction force between the arc-shaped rack 21 and the arc-shaped rotating block 5. In this way, the arc-shaped rack 21 can be prevented from using the friction force to drive the tooth block 22 and the arc-shaped rotating block 5 to reverse, so as to prevent the opening direction of the piston ring 101 from changing.

[0042] See also Fig.11 and Fig.12 As shown, a sensing mechanism is also included, which includes a connecting plate III 28 and a distance sensor 29; the connecting plate III 28 is installed on the left rear side of the workbench 1; the distance sensor 29 is installed on the upper front side of the connecting plate III 28, and the distance sensor 29 is used to sense the distance between the connecting plate II 11, and the distance sensor 29 is electrically connected to the control panel 2.

[0043] When the connecting plate II 11 moves downward, the connecting plate II 11 will leave the sensing range of the distance sensor 29; when the connecting plate II 11 moves upward to reset, the connecting plate II 11 will gradually enter the sensing range of the distance sensor 29. When the distance sensor 29 senses the connecting plate II 11, the distance sensor 29 will sense that the distance between itself and the connecting plate II 11 is less than a preset value. At this time, the distance sensor 29 will send a signal. After receiving the signal, the control panel 2 will automatically control the cylinder I 7 to drive the connecting plate I 8 and the sleeve 9 to move upward for a certain distance, so that the bottom end of the sleeve 9 is flush with the position in the groove of the piston body 102 where the piston ring 101 needs to be installed. In this way, there is no need for manual control for easy use.

[0044] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An adjustable fixture for mounting a lawn mower engine assembly, comprising a workbench (1), characterized in that: It also includes a control panel (2), an arc-shaped fixed clamp (3), an arc-shaped movable clamp (4), an arc-shaped rotating block (5), an arc-shaped rubber plate (6), a cylinder I (7), a connecting plate I (8), a sleeve (9), an electric push rod (10), a connecting plate II (11), a pressure ring (12), a pre-pressing mechanism, an opening and closing mechanism and a rotating mechanism. The control panel (2) is installed on the workbench (1), the arc-shaped fixed clamp (3) is installed on the workbench (1), and the arc-shaped movable clamp (4) is rotatably installed on the workbench (1). The arc-shaped fixed clamp (3) and the arc-shaped movable clamp (4) are both rotatably provided with an arc-shaped rotating block (5), the arc-shaped rubber plate (6) is connected to the arc-shaped rotating block (5), and the arc-shaped rubber plate (6) is used to clamp the piston body (102), the cylinder I (7) is installed on the workbench (1), the connecting plate I (8) is connected to the telescopic rod of the cylinder I (7), the sleeve (9) is connected to the connecting plate I (8), and the sleeve (9) is used to load the piston ring (101), and the electric push rod (10) is installed on the workbench (1), a connecting plate II (11) is connected to the telescopic rod of the electric push rod (10), a pressure ring (12) is connected to the connecting plate II (11), and the pressure ring (12) is used to press the piston ring (101) into the groove (16) of the piston body (102), the pre-pressing mechanism is used to press one end of the piston ring (101) downward in advance, the opening and closing mechanism is used to drive the arc-shaped movable clamp (4) to rotate, and the rotating mechanism is used to drive the arc-shaped rotating block (5) to rotate; the pre-pressing mechanism includes a stopper (1 3), a pressure block (14) and a spring I (15), the stopper (13) is connected to the connecting plate I (8), the pressure block (14) is slidably mounted on the pressure ring (12), the pressure block (14) contacts the stopper (13) when moving, and the pressure block (14) is used to press down one end of the piston ring (101) in advance, the two ends of the spring I (15) are respectively connected to the pressure block (14) and the pressure ring (12), the pressure block (14) is provided with a groove (16), and the groove (16) is used for the stopper (13) to be clamped.

2. An adjustable clamp for mounting a lawn mower engine assembly according to claim 1, characterized in that: The opening and closing mechanism comprises a cylinder II (17) and an elliptical block (18). The cylinder II (17) is mounted on a workbench (1). The elliptical block (18) is connected to a telescopic rod of the cylinder II (17). An elliptical hole (181) is formed on the elliptical block (18). The arc-shaped movable clamp (4) moves in the elliptical hole (181).

3. An adjustable clamp for mounting a lawn mower engine assembly according to claim 2, characterized in that: The rotating mechanism comprises a connecting rod (19), a round rod (20) and an arc-shaped rack (21); the connecting rod (19) is connected to the pressure ring (12); the round rods (20) are arranged at intervals on the connecting rod (19); the arc-shaped fixed clamp (3) and the arc-shaped movable clamp (4) are both rotatably arranged with the arc-shaped rack (21); when the round rod (20) moves, it contacts the arc-shaped rack (21).

4. The adjustable clamp for mounting a lawn mower engine assembly according to claim 3, characterized in that: The rotating mechanism further comprises a tooth block (22), a torsion spring (23) and a limit block (24); the tooth block (22) is rotatably arranged on the arc-shaped rotating block (5) on one side; the tooth block (22) is meshed with the arc-shaped rack (21); two ends of the torsion spring (23) are respectively connected to the tooth block (22) and the arc-shaped rotating block (5) on one side; the limit block (24) is installed on the arc-shaped rotating block (5) on the same side as the tooth block (22); and the limit block (24) is used to limit the tooth block (22).

5. An adjustable clamp for mounting a lawn mower engine assembly according to claim 4, characterized in that: It also includes a supporting block (25), which is connected to the bottom end of the arc-shaped rotating block (5) on the arc-shaped fixing clamp (3), and the supporting block (25) is used to support the piston body (102).

6. An adjustable clamp for mounting a lawn mower engine assembly according to claim 5, characterized in that: The invention also includes a resistance increasing mechanism, which includes a friction plate (26) and a spring II (27). The friction plate (26) is slidably arranged on the workbench (1), and the friction plate (26) is in contact with the arc-shaped rotating block (5) on the arc-shaped fixing clamp (3). The two ends of the spring II (27) are respectively connected to the friction plate (26) and the workbench (1).

7. An adjustable clamp for mounting a lawn mower engine assembly according to claim 6, characterized in that: The invention also comprises a sensing mechanism, which comprises a connecting plate III (28) and a distance sensor (29). The connecting plate III (28) is mounted on the workbench (1), and the distance sensor (29) is mounted on the connecting plate III (28). The distance sensor (29) is used to sense the distance between the connecting plate III and the connecting plate II (11).

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