Electric loop chain tightener

Abstract

The utility model discloses an electric loop chain tightener. Comprising an upper lifting hook assembly, a lower lifting hook assembly, a loop chain and a wire tightening body fixedly connected to the upper lifting hook assembly. A transmission system, a driving mechanism, a manual operation structure for switching to a neutral gear, an electric cabinet and a shell are arranged in the wire tightening main body, and the shell is composed of a first wall plate, a second wall plate, a front cover and a rear cover. The transmission system is composed of a motor, a first gear shaft, a second gear shaft, a third gear shaft and a transmission mechanism. The switching structure is provided with a positioning locking block, a movable pull rod and a reset spring, a heart-shaped locking sliding way with a step structure is utilized, locking and releasing of a second transmission gear shaft at different positions are achieved, and then the meshing state of a second driven gear and a third driving gear is switched. The manual mode can be rapidly switched to the neutral gear manual mode when motor driving fails or a battery is insufficient or a switching state is needed, rapid closing of the loop chain is achieved, the operation process is simplified, and the safety, durability and use efficiency of the whole machine are improved.

Description

Technical Field

[0001] This utility model belongs to the field of wire tensioner technology, and specifically relates to an electric chain wire tensioner. Background Technology

[0002] An electric chain tensioner is a mechanical tool that uses electricity to tension or pull chains. It is mainly used in the power, telecommunications, and construction industries for efficient and precise tension adjustment or lifting of cables, ropes, or chains. Early tensioners relied on manual labor (such as hand wrenches) or hydraulic drives, resulting in low efficiency and high labor intensity, especially in high-voltage transmission lines and large-scale projects where they could not meet the high-intensity, high-precision operational requirements. With the development of industrial automation, electric tools have gradually replaced traditional tools. The electric chain tensioner combines motor drive and chain transmission technology, achieving higher load capacity, controllability, and ease of operation. It is mainly used in power engineering for conductor tensioning and insulator replacement during high-voltage transmission line erection; in telecommunications construction for overhead fiber optic and cable laying and tension adjustment; in building and bridge construction for steel structure hoisting, cableway installation, or bridge cable tensioning; and in shipbuilding and heavy industry for positioning large equipment and securing cargo.

[0003] Existing electric chain tensioning machines generally include an electric drive system, a chain transmission mechanism, and a control system. The electric drive system incorporates a built-in motor (usually a DC or AC motor) that outputs high torque through a reduction gear to drive the chain. The chain transmission mechanism uses a high-strength alloy steel chain, achieving linear traction through sprocket engagement, combining flexibility with load-bearing capacity (common load range 1-20 tons). The control system is equipped with an electronic controller, overload protection, wireless remote control, and supports precise tension adjustment (such as setting a preset tension value) and emergency braking. Existing electric chain tensioning machines offer integrated manual and automatic operation, featuring rapid chain retraction in neutral and manual operation.

[0004] like Figure 1 The image shown is a perspective view of the tensioning body of a prior art electric chain tensioning machine. The tensioning body has a locking structure with an elastic clip P1. A first annular groove P3 and a second annular groove P4 are provided at the end of the second transmission gear shaft P2 extending from the front cover. When the second transmission gear shaft P2 meshes with the gear on the third transmission gear shaft, as shown... Figure 1As shown, the elastic clip P1 engages in the second annular groove P4. When the second and third transmission gear shafts need to be disengaged and in neutral, one person moves the elastic clip P1 away from the second annular groove P4, presses down the second transmission gear shaft P2, and then inserts the elastic clip P1 into the first annular groove P3. When the gears on the second and third transmission gear shafts need to mesh again, two people are required. One person moves the elastic clip P1 away from the first annular groove P3 and simultaneously lifts the second transmission gear shaft P2, while the other person pulls the chain to adjust the alignment of the gears on the second and third transmission gear shafts. Once they are accurately aligned, they mesh, and then the elastic clip P1 is inserted into the first annular groove P3. This method is relatively cumbersome, requiring two people to manually adjust the chain for alignment, increasing the cost of use, inconvenience, and reducing the user experience. Utility Model Content

[0005] The technical problem to be solved by this utility model is to address the shortcomings of existing electric chain tensioning machines by providing an electric chain tensioning machine that is easy to operate, has a simple overall appearance, and reduces the cost of use.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] An electric chain tensioning machine includes an upper hook assembly, a lower hook assembly, a chain, and a tensioning body. The chain is wound around the tensioning body, which is fixedly connected to the upper hook assembly. The lower hook assembly is located at one end of the chain. The tensioning body includes a transmission system, a drive mechanism for driving the chain, a switching structure for switching the electric chain tensioning machine to neutral, an electrical control box, and a housing. The housing includes a first wall plate and a second wall plate fixed to both sides of the upper hook assembly, and a front cover and a rear cover located on the outer sides of the first and second wall plates. The transmission system includes a motor located on the outer side of the second wall plate, a first gear shaft connected to the motor output shaft, a second gear shaft cooperating with the first gear shaft, a third gear shaft, and a transmission mechanism cooperating with the third gear shaft and driving the drive mechanism. The first gear shaft includes a first transmission gear shaft and a first transmission gear. The second gear shaft includes a second transmission gear shaft parallel to the first transmission gear shaft, a second driving gear, and a second driven gear. The third gear shaft includes a third transmission gear shaft parallel to the second transmission gear shaft, a third driving gear, and a third driving gear. The transmission mechanism comprises a drive gear and a third driven gear; the first transmission gear meshes with the second drive gear, and the second driven gear engages with the third drive gear; the switching structure includes a positioning lock block, a pull rod movably sleeved on the second transmission gear shaft, and a return spring disposed between the positioning lock block and the second transmission shaft; the positioning lock block is fixedly disposed on the second wall plate and is positioned opposite to the end of the second transmission gear shaft; one end of the pull rod is an annular limiting ring, and the other end is a positioning hook; the positioning lock block is provided with a locking slide that engages with the positioning hook; the second transmission gear shaft is disposed on the first wall plate and the front cover, one end of which extends out of the front cover to form the manual operation part of the manual control chain, and the other end of which passes through the first wall plate and abuts against the return spring; the second transmission gear shaft has an annular groove at the end that extends out of the first wall plate, and the limiting ring is movably sleeved in the annular groove; by pressing the second transmission gear shaft, the positioning hook on the pull rod engages with the locking slide, so that the second transmission gear shaft is locked in different positions after being pressed, thereby realizing the separation or engagement of the second driven gear and the third drive gear.

[0008] Furthermore, the locking slide forms a heart-shaped closed path, which is sequentially formed by a first slide, a second slide, a third slide, and a fourth slide connected counterclockwise. The starting position of the first slide connects to the ending position of the fourth slide, the ending position of the first slide connects to the starting position of the second slide, the ending position of the second slide connects to the starting position of the third slide, and the ending position of the third slide connects to the starting position of the fourth slide. The connection between the starting position of the first slide and the ending position of the fourth slide is a concave structure, forming a gear-like meshing positioning point. The ending position of the second slide... The connection between the first and second slides and the starting position of the third slide is a concave structure, forming a separation positioning point for gear separation; the engagement positioning point is located at the near end of the second gear shaft, and the separation positioning point is located at the far end of the second gear shaft; steps are provided at the end positions of the first, second, third, and fourth slides, wherein the starting position of the first slide is lower than the ending position of the fourth slide, the starting position of the second slide is lower than the ending position of the first slide, the starting position of the third slide is lower than the ending position of the second slide, and the starting position of the fourth slide is lower than the ending position of the third slide.

[0009] By setting a stepped structure within the locking slide, the accurate sliding path of the positioning rod can be ensured, guaranteeing the accuracy of gear separation and engagement.

[0010] Furthermore, the first, second, third, and fourth slides all have a slope with guide and positioning hooks.

[0011] Furthermore, the second transmission gear shaft has a groove on its end face that protrudes from the first wall plate, and a spring seat that limits one end of the reset spring is provided in the groove, with the other end of the reset spring abutting against the positioning lock block.

[0012] Furthermore, the pull rod is perpendicular to the radial surface of the limiting ring and fixed on the ring line of the limiting ring; the positioning hook elastically abuts against the locking slide.

[0013] Preferably, a micro switch for switching the main power supply of the electric chain tensioner is also provided between the first wall panel and the second wall panel; the contact of the micro switch is engaged with the end of the second transmission gear shaft that passes through the first wall panel, and the end has a chamfered surface formed by a right angle. When the contact slides from the chamfered surface to the side of the second transmission gear shaft, the main power supply of the electric chain tensioner is de-energized.

[0014] Preferably, the transmission mechanism includes a fourth gear shaft cooperating with the third gear shaft and a sprocket shaft cooperating with the fourth gear shaft; the fourth gear shaft includes a fourth transmission gear shaft parallel to the third transmission gear shaft, a fourth driving gear cooperating with the third driven gear, and a fourth driven gear cooperating with the sprocket shaft; the third transmission gear shaft passes through the second wall plate and the first wall plate, the third driving gear is disposed on the outside of the first wall plate and cooperates with the second driven gear, and the third driven gear is disposed on the outside of the second wall plate and meshes with the fourth driving gear; there are two sets of fourth gear shafts, respectively disposed on both sides of the third driven gear, both disposed on the outside of the second wall plate; the sprocket shaft is sleeved on the third transmission gear shaft, and a shaft gear is disposed on the end of the sprocket shaft extending out of the second wall plate, the shaft gear meshing with the fourth driven gears on both sides.

[0015] Preferably, the drive mechanism includes a chain guide box disposed below the second wall panel and the first wall panel, and a sprocket disposed within the chain guide box; the sprocket is fixedly connected to a sprocket shaft, and both the sprocket and the sprocket shaft are sleeved on a third transmission gear shaft; the ring chain is wound around the sprocket, and its outer side is restricted by the chain guide box.

[0016] Working principle of this electric chain tensioning machine:

[0017] When the chain of the electric chain tensioner is too long and needs to be quickly tightened, or when the battery is dead, or when the motor malfunctions, manual control of the electric chain tensioner is required. The electric chain tensioner should be adjusted to neutral, and the chain should be manually pulled. This process only requires pressing the manual operating part of the second transmission gear shaft. The second driven gear on the second transmission gear shaft separates from the third driving gear on the third transmission gear shaft. The positioning hook at the end of the lever slides along the first slide to the starting position of the second slide and then falls into the separation positioning point formed by the connection between the second and third slides. The positioning hook also falls into the starting position of the third slide. At this time, the second transmission gear shaft compresses the return spring, and the hook overcomes the spring force of the return spring to fix the second transmission gear shaft, thereby separating the second driven gear from the third driving gear. Simultaneously, through the interaction of the second transmission gear shaft and the contacts on the micro switch, the main power supply to the electric chain tensioner is cut off to prevent accidental operation.

[0018] When switching to automatic motor-driven chain winding and unwinding, press the manual operating part of the second transmission gear shaft again. The positioning hook at the end of the lever slides in the third slide to the starting position of the fourth slide. Under the action of the return spring, the positioning hook slides along the fourth slide to the starting position of the first slide, which is the engagement positioning point, thereby driving the second driven gear to mesh with the third driving gear. If the teeth of the second driven gear and the third driving gear fail to align to the engagement position during the engagement process, after releasing the manual operating part, the position of the chain can be finely adjusted to align and mesh the second driven gear and the third driving gear. This process can be completed by one person and only requires pressing the manual operating part, saving operating procedures.

[0019] The beneficial effects of this electric chain tensioning machine are as follows:

[0020] By employing a positioning lock block and a locking slide structure consisting of first, second, third, and fourth slides, the operator can quickly switch from automatic motor drive mode to manual neutral mode simply by pressing the manual operation part of the second transmission gear shaft. This avoids the cumbersome operation of two people coordinating the adjustment in the original system, greatly simplifying the operation process and control program.

[0021] When switching to manual control mode, the positioning hook moves along the slide to the separation positioning point and fixes the second transmission gear shaft, thereby separating the second driven gear from the third driving gear. At the same time, the design of the linkage micro switch at the end of the second transmission gear shaft ensures that the main power supply of the electric chain tensioner is cut off, preventing misoperation and accidental start-up, and effectively preventing safety risks caused by improper operation.

[0022] When the chain is too long, the battery is low, or the motor malfunctions, the operator can quickly switch to manual neutral mode and pull the chain directly to quickly retract it, meeting the rapid adjustment requirements for emergency situations or specific working conditions on the construction site and ensuring that the project progress is not affected.

[0023] The stepped, height-difference configuration of multiple slides in the positioning lock block not only ensures the precise transition between locked and unlocked states, but also helps to balance the force on the transmission gear shaft, prevent local structural overload and front cover deformation, thereby extending the service life of the whole machine and improving the overall stability of the equipment.

[0024] In summary, this utility model of electric chain tensioning machine, through optimization of the locking structure and transmission system, not only simplifies the operation process and enables single-person control, but also significantly improves safety, structural durability, and emergency adaptability, thus possessing significant practical value and market competitive advantages. Attached Figure Description

[0025] A brief explanation of the contents of each figure in the instruction manual and the markings in the figures is provided:

[0026] Figure 1 This is a schematic diagram of the structure of the tensioning body in the prior art.

[0027] Figure 2 This is a three-dimensional view of the electric chain tensioning machine as an example.

[0028] Figure 3 This is a schematic diagram of the structure of the electric chain tensioning machine after the front cover has been removed, as shown in the example.

[0029] Figure 4 for Figure 2 Plan view of electric chain tensioning machine;

[0030] Figure 5 for Figure 4 A schematic diagram of the structure after being cut at point AA;

[0031] Figure 6 for Figure 4 Sectional view at point BB;

[0032] Figure 7 for Figure 4 A partial sectional view of the main body of the center line after rotation;

[0033] Figure 8 This is a schematic diagram of the structure of the positioning lock block, the locking slide, and the positioning hook in the embodiment;

[0034] Figure 9 This is a diagram showing the state of engagement and disengagement between the second driven gear and the third driving gear in the embodiment.

[0035] In the picture:

[0036] P1 is an elastic clip, P2 is the second transmission gear shaft, P3 is the first annular groove, and P4 is the second annular groove.

[0037] 1 is the upper hook assembly;

[0038] 2 is the lower hook assembly;

[0039] 3 represents a ring chain;

[0040] 4 represents the shell; 4-1 represents the first wall panel; 4-2 represents the second wall panel; 4-3 represents the front cover; 4-4 represents the rear cover;

[0041] 5 represents the motor;

[0042] 6 is the first gear shaft; 6-1 is the first transmission gear shaft; 6-2 is the first transmission gear;

[0043] 7 is the second gear shaft; 7-1 is the second transmission gear shaft; 7-2 is the second driving gear; 7-3 is the second driven gear; 7-4 is the manual operation part; 7-5 is the annular groove; 7-6 is the inclined surface;

[0044] 8 is the third gear shaft; 8-1 is the third transmission gear shaft; 8-2 is the third driving gear; 8-3 is the third driven gear;

[0045] 9 is the positioning lock block; 9-1 is the first slide rail; 9-2 is the second slide rail; 9-3 is the third slide rail; 9-4 is the fourth slide rail; 9-5 is the engagement positioning point; 9-6 is the disengagement positioning point;

[0046] 10 is a pull rod;

[0047] 11 is the return spring;

[0048] 12 is a limit ring;

[0049] 13 is a positioning hook;

[0050] 14 is a spring seat;

[0051] 15 is the fourth gear shaft; 15-1 is the fourth transmission gear shaft; 15-2 is the fourth driving gear; 15-3 is the fourth driven gear;

[0052] 16 is the sprocket shaft; 16-1 is the shaft gear;

[0053] 17 is the chain guide box;

[0054] 18 represents a sprocket;

[0055] 19 is a micro switch. Detailed Implementation

[0056] The present invention will be further described below with reference to the accompanying drawings, providing a non-limiting embodiment. However, it should be understood that these descriptions are merely illustrative and not intended to limit the scope of the present invention. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the present invention.

[0057] Example

[0058] like Figure 2 , 3As shown in Figure 4, an electric chain tensioning machine includes an upper hook assembly 1, a lower hook assembly 2, a chain 3, and a tensioning body. The chain 3 is wound around the tensioning body, which is fixedly connected to the upper hook assembly 1. The lower hook assembly 2 is located at one end of the chain 3. The tensioning body includes a transmission system, a drive mechanism for driving the chain 3, a switching structure for switching the electric chain tensioning machine to neutral, an electrical control box, and a housing 4. The housing 4 includes a first wall plate 4-1 and a second wall plate 4-2 fixed on both sides of the upper hook assembly 1, and a front cover 4-3 located on the outside of the first wall plate 4-1 and a rear cover 4-4 located on the outside of the second wall plate 4-2. The transmission system includes... It includes a motor 5 disposed on the outside of the second wall panel 4-2, a first gear shaft 6 connected to the output shaft of the motor 5, a second gear shaft 7 cooperating with the first gear shaft 6, a third gear shaft 8 cooperating with the third gear shaft 8 and a transmission mechanism that drives the drive mechanism; the first gear shaft 6 includes a first transmission gear shaft 6-1 and a first transmission gear 6-2, the second gear shaft 7 includes a second transmission gear shaft 7-1 parallel to the first transmission gear shaft 6-1, a second driving gear 7-2 and a second driven gear 7-3; the third gear shaft 8 includes a third transmission gear shaft 8-1 parallel to the second transmission gear shaft 7-1, a third driving gear 8-2 and a third driven gear 8-3.

[0059] like Figure 5 , 6 As shown, the transmission mechanism includes a fourth gear shaft 15 that mates with the third gear shaft 8 and a sprocket shaft 16 that mates with the fourth gear shaft 15; the fourth gear shaft 15 includes a fourth transmission gear shaft 15-1 parallel to the third transmission gear shaft 8-1, a fourth driving gear 15-2 mates with the third driven gear 8-3, and a fourth driven gear 15-3 mates with the sprocket shaft 16; the third transmission gear shaft 8-1 passes through the second wall plate 4-2 and the first wall plate 4-1, and the third driving gear 8-2 is disposed on the first wall plate 4-2. The outer side of the first wall plate 4-2 engages with the second driven gear 7-3, and the third driven gear 8-3 is located on the outer side of the second wall plate 4-2 and meshes with the fourth driving gear 15-2. The fourth gear shaft 15 consists of two sets, located on both sides of the third driven gear 8-3, both on the outer side of the second wall plate 4-2. The sprocket shaft 16 is sleeved on the third transmission gear shaft 8-1, and a shaft gear 16-1 is provided on the end of the sprocket shaft 16 extending outward from the second wall plate 4-2. The shaft gear 16-1 meshes with the fourth driven gears 15-3 on both sides. The drive mechanism includes a chain guide box 17 located below the second wall plate 4-2 and the first wall plate 4-1, and a sprocket 18 located within the chain guide box 17. The sprocket 18 is fixedly connected to the sprocket shaft 16, and both the sprocket 18 and the sprocket shaft 16 are sleeved on the third transmission gear shaft 8-1. The ring chain 3 is wound around the sprocket 18, and its outer side is restricted by the chain guide box 17.

[0060] like Figure 6 , 7As shown, the first transmission gear 6-2 meshes with the second driving gear 7-2, and the second driven gear 7-3 engages with the third driving gear 8-2; the switching structure includes a positioning lock block 9, a pull rod 10 movably sleeved on the second transmission gear shaft 7-1, and a return spring 11 disposed between the positioning lock block 9 and the second transmission shaft; the positioning lock block 9 is fixedly disposed on the second wall plate 4-2 and is disposed opposite to the end of the second transmission gear shaft 7-1; one end of the pull rod 10 is an annular limiting ring 12, and the other end is a positioning hook 13; the positioning lock block 9 is provided with a locking slide that engages with the positioning hook 13; the second transmission gear shaft 7-1 is provided with The first drive gear 7-1 is placed on the first wall plate 4-1 and the front cover 4-3. One end of the drive gear 7-1 extends out of the front cover 4-3 to form the manual operation part 7-4 of the manual control chain 3. The other end of the drive gear 7-1 passes through the first wall plate 4-1 and abuts against the return spring 11. The second drive gear 7-1 has an annular groove 7-5 at the end that extends out of the first wall plate 4-1. The limiting ring 12 is movably fitted in the annular groove 7-5. By pressing the second drive gear 7-1, the positioning hook 13 on the pull rod 10 is engaged with the locking slide, so that the second drive gear 7-1 is locked in different positions after being pressed, thereby realizing the separation or engagement of the second driven gear 7-3 and the third driving gear 8-2.

[0061] like Figure 7 , 8As shown, the locking slide forms a heart-shaped closed path, consisting of a first slide 9-1, a second slide 9-2, a third slide 9-3, and a fourth slide 9-4 connected counterclockwise. The starting position of the first slide 9-1 connects to the ending position of the fourth slide 9-4, the ending position of the first slide 9-1 connects to the starting position of the second slide 9-2, the ending position of the second slide 9-2 connects to the starting position of the third slide 9-3, and the ending position of the third slide 9-3 connects to the starting position of the fourth slide 9-4. The connection between the starting position of the first slide 9-1 and the ending position of the fourth slide 9-4 is a concave structure, forming a gear-like meshing positioning point 9-5. The second slide 9-2... The connection between the termination position and the starting position of the third slide 9-3 is a concave structure, forming a separation positioning point 9-6 for gear separation; the engagement positioning point 9-5 is located at the proximal end of the second gear shaft 7, and the separation positioning point 9-6 is located at the distal end of the second gear shaft 7; steps are provided at the termination positions of the first slide 9-1, the second slide 9-2, the third slide 9-3, and the fourth slide 9-4, wherein the starting position of the first slide 9-1 is lower than the termination position of the fourth slide 9-4, the starting position of the second slide 9-2 is lower than the termination position of the first slide 9-1, the starting position of the third slide 9-3 is lower than the termination position of the second slide 9-2, and the starting position of the fourth slide 9-4 is lower than the termination position of the third slide 9-3. The first slide 9-1, the second slide 9-2, the third slide 9-3, and the fourth slide 9-4 all have a slope of guide positioning hook 13. The second transmission gear shaft 7-1 has a groove on its end face that protrudes from the first wall plate 4-1. A spring seat 14 is provided in the groove to limit one end of the return spring 11. The other end of the return spring 11 abuts against the positioning lock block 9. The pull rod 10 is perpendicular to the radial surface of the limiting ring 12 and fixed on the ring line of the limiting ring 12; the positioning hook 13 elastically abuts against the locking slide.

[0062] like Figure 9 As shown, a micro switch 19 for switching the main power supply of the electric chain tensioner is also provided between the first wall plate 4-1 and the second wall plate 4-2; the contact of the micro switch 19 engages with the end of the second transmission gear shaft 7-1 that passes through the first wall plate 4-1, and the end has a chamfered surface 7-6 formed by a right angle. When the contact slides from the chamfered surface 7-6 to the side of the second transmission gear shaft 7-1, the main power supply of the electric chain tensioner is de-energized.

[0063] The following is a complete description of the basic process of switching modes of the electric chain tensioner in the embodiments of this utility model, and the steps and their interrelationships are explained in conjunction with the accompanying drawings.

[0064] [The process of switching to manual neutral mode]

[0065] Manual start

[0066] When abnormal conditions occur, such as excessive chain length, insufficient power supply, or motor 5 malfunction, the operator needs to switch the electric chain tensioner to neutral manual mode. At this time, the operator initiates the switching process by pressing the manual operation part 7-4 located at the extension of the front cover 4-3 of the second transmission gear shaft 7-1.

[0067] Gear separation and positioning hook 13 movement

[0068] like Figure 6 , 7 As shown, after pressing the manual operation unit 7-4, the second driven gear 7-3 on the second transmission gear shaft 7-1 begins to separate from the third driving gear 8-2 on the third transmission gear shaft 8-1. Simultaneously, as... Figure 7 , 8 As shown, the positioning hook 13 at the end of the movable pull rod 10 moves along the locking slide that forms a heart-shaped closed path on the positioning locking block 9. Figure 9 As shown, specifically, the positioning hook 13 is initially positioned at the starting position of the first slide 9-1 in the locking slide. When the operating part is pressed, the positioning hook 13 slides along the first slide 9-1 towards the starting position of the second slide 9-2 until it reaches the junction of the first slide 9-1 and the second slide 9-2. Then, the positioning hook 13 moves along the second slide 9-2 into the starting position of the third slide 9-3, which is the separation positioning point 9-6. At this time, the second transmission gear shaft 7-1 is compressed inward by the pressure of the operating part, compressing the return spring 11 and holding it in a predetermined position, thereby ensuring complete separation between the second driven gear 7-3 and the third driving gear 8-2.

[0069] Power disconnection protection

[0070] At the same time, such as Figure 9 As shown, the inclined surface 7-6 on the end of the second transmission gear shaft 7-1 that passes through the first wall plate 4-1 engages with the contact of the micro switch 19. When the second transmission gear shaft 7-1 is adjusted to the neutral position, the contact slides from the inclined surface 7-6 to the side of the gear shaft, triggering the micro switch 19 to disconnect the main power supply to the electrical control box and prevent accidental start-up.

[0071] The process of switching from manual to neutral mode back to automatic drive mode.

[0072] Trigger manual operation again

[0073] When it is necessary to restore the automatic drive state of motor 5 to retract chain 3, the operator presses the manual operation part 7-4 of the second transmission gear 7-1 again to release the previously fixed second transmission gear 7-1 from the compressed state.

[0074] Gear meshing and positioning hook 13 movement

[0075] like Figure 9As shown, after pressing the manual operation part 7-4, the positioning hook 13 on the movable lever 10 begins to slide along the locking slide from the starting position of the third slide 9-3 to the fourth slide 9-4. Then, the manual operation part 7-4 is gradually released, and the second transmission gear shaft 7-1, under the continuous action of the return spring 11, slides the positioning hook 13 from the fourth slide 9-4 along the preset slope to the starting position of the first slide 9-1, that is, the engagement positioning point 9-5, as shown. Figure 7 , 8 As shown, this achieves the reset of the second transmission gear shaft 7-1.

[0076] Gear re-meshing

[0077] After the positioning hook 13 falls into the engagement positioning point 9-5 of the first slide rail 9-1, the second driven gear 7-3 of the second transmission gear shaft 7-1 and the third driving gear 8-2 of the third transmission gear shaft 8-1 are accurately re-engaged. If the gear teeth are not fully aligned during the engagement process, the operator only needs to slightly adjust the position of the ring chain 3 until the gear teeth are correctly engaged. The entire switching process is thus completed. This process can be operated by a single person, greatly simplifying the usage steps.

[0078] The second driving gear 7-2 is thinner than the first transmission gear 6-2. Regardless of whether the second driven gear 7-3 is separated from or engaged with the third driving gear 8-2, the second driving gear 7-2 is always engaged with the first transmission gear 6-2 and can slide along the tooth groove of the first transmission gear 6-2.

[0079] Through the above steps, the electric chain tensioner achieves the process of switching from automatic drive mode to manual neutral mode, and then back to automatic drive mode. This switching process utilizes the heart-shaped locking slide on the positioning lock block 9 and the sliding movement of the positioning hook 13 on the pull rod 10 to ensure precise separation and engagement between gears. At the same time, the power is disconnected for protection through the micro switch 19, thereby improving the overall safety, convenience and reliability of operation.

[0080] In the description of this utility model, it should be understood that the use of terms such as "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, is merely for the convenience of describing this utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model. Furthermore, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0081] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. An electric endless chain tightener, comprising an upper hook assembly (1), a lower hook assembly (2), an endless chain (3) and a tightener body; the endless chain (3) is arranged on the tightener body, the tightener body is fixedly connected to the upper hook assembly (1), and the lower hook assembly (2) is arranged at one end of the endless chain (3); the tightener body comprises a transmission system, a driving mechanism for driving the endless chain (3), a switching structure for switching the electric endless chain tightener to an idle position, an electric control box and a shell (4); the shell (4) comprises first and second wall plates (4-1 and 4-2) fixed to both sides of the upper hook assembly (1), a front cover (4-3) arranged outside the first wall plate (4-1) and a rear cover (4-4) arranged outside the second wall plate (4-2); the transmission system comprises a motor (5) arranged outside the second wall plate (4-2), a first gear shaft (6) connected to an output shaft of the motor (5), a second gear shaft (7) matched with the first gear shaft (6), a third gear shaft (8) and a transmission mechanism matched with the third gear shaft (8) and driving the driving mechanism; the first gear shaft (6) comprises a first transmission gear shaft (6-1) and a first transmission gear (6-2), the second gear shaft (7) comprises a second transmission gear shaft (7-1) parallel to the first transmission gear shaft (6-1), a second driving gear (7-2) and a second driven gear (7-3); the third gear shaft (8) comprises a third transmission gear shaft (8-1) parallel to the second transmission gear shaft (7-1), a third driving gear (8-2) and a third driven gear (8-3). characterized in that The first transmission gear (6-2) is engaged with the second driving gear (7-2), and the second driven gear (7-3) is matched with the third driving gear (8-2); the switching structure comprises a positioning lock block (9), a pull rod (10) movably sleeved on the second transmission gear shaft (7-1), and a return spring (11) arranged between the positioning lock block (9) and the second transmission shaft; the positioning lock block (9) is fixedly arranged on the second wall plate (4-2) and is arranged opposite to the end of the second transmission gear shaft (7-1); one end of the pull rod (10) is a limiting ring (12), and the other end is a positioning pull hook (13); the positioning lock block (9) is provided with a locking slide way matched with the positioning pull hook (13); the second transmission gear shaft (7-1) is arranged on the first wall plate (4-1) and the front cover (4-3), one end of which extends out of the front cover (4-3) to form a manual operation part (7-4) of the manual control endless chain (3), and the other end thereof penetrates through the first wall plate (4-1) to abut against the return spring (11); the end of the second transmission gear shaft (7-1) penetrating through the first wall plate (4-1) is provided with an annular groove (7-5), and the limiting ring (12) is movably sleeved in the annular groove (7-5); by pressing the second transmission gear shaft (7-1), the positioning pull hook (13) on the pull rod (10) is matched with the locking slide way, so that the second transmission gear shaft (7-1) is locked at different positions after being pressed, thereby realizing the separation or engagement of the second driven gear (7-3) and the third driving gear (8-2).

2. A motorized round link tightener as defined in claim 1, wherein, The locking slide forms a closed path in the shape of a heart, and is sequentially closed by a first slide (9-1), a second slide (9-2), a third slide (9-3) and a fourth slide (9-4) connected in sequence counterclockwise; the starting position of the first slide (9-1) is connected with the ending position of the fourth slide (9-4), the ending position of the first slide (9-1) is connected with the starting position of the second slide (9-2), the ending position of the second slide (9-2) is connected with the starting position of the third slide (9-3), and the ending position of the third slide (9-3) is connected with the starting position of the fourth slide (9-4); wherein the connection between the starting position of the first slide (9-1) and the ending position of the fourth slide (9-4) is a concave structure and forms a meshing positioning point (9-5) of gear meshing, and the connection between the ending position of the second slide (9-2) and the starting position of the third slide (9-3) is a concave structure and forms a separation positioning point (9-6) of gear separation; the meshing positioning point (9-5) is arranged at the proximal end of the end portion of the second gear shaft (7), and the separation positioning point (9-6) is arranged at the distal end of the end portion of the second gear shaft (7); the ending positions of the first slide (9-1), the second slide (9-2), the third slide (9-3) and the fourth slide (9-4) are all provided with steps, wherein the starting position of the first slide (9-1) is lower than the ending position of the fourth slide (9-4), the starting position of the second slide (9-2) is lower than the ending position of the first slide (9-1), the starting position of the third slide (9-3) is lower than the ending position of the second slide (9-2), and the starting position of the fourth slide (9-4) is lower than the ending position of the third slide (9-3).

3. A motorized round link tightener as defined in claim 2 wherein, The first slide (9-1), the second slide (9-2), the third slide (9-3) and the fourth slide (9-4) all have slopes for guiding and positioning the hooks (13).

4. A motorized round link tightener as defined in claim 1 wherein, The second transmission gear shaft (7-1) is provided with a groove on the end face penetrating through the first wall plate (4-1), and a spring seat (14) for limiting one end of a reset spring (11) is arranged in the groove, and the other end of the reset spring (11) abuts against the positioning lock block (9).

5. A motorized round link tightener as defined in claim 1 wherein, The pull rod (10) is arranged perpendicularly to the radial surface of the limiting ring (12) and is fixed on the ring line of the limiting ring (12); the positioning hooks (13) elastically abut in the locking slide.

6. A motorized round link tightener as defined in claim 1 wherein, A micro switch (19) for switching the total power supply of the electric ring chain tightener is further arranged between the first wall plate (4-1) and the second wall plate (4-2); the contact of the micro switch (19) is matched with the end portion of the second transmission gear shaft (7-1) penetrating through the first wall plate (4-1), and the end portion has an inclined surface (7-6) formed by an inverted right angle; when the contact slides from the inclined surface (7-6) to the side surface of the second transmission gear shaft (7-1), the total power supply of the electric ring chain tightener is powered off.

7. A motorized round link tightener as defined in claim 1 wherein, The transmission mechanism comprises a fourth gear shaft (15) matched with the third gear shaft (8) and a sprocket shaft (16) matched with the fourth gear shaft (15); the fourth gear shaft (15) comprises a fourth transmission gear shaft (15-1) parallel to the third transmission gear shaft (8-1), a fourth driving gear (15-2) matched with the third driven gear (8-3) and a fourth driven gear (15-3) matched with the sprocket shaft (16); the third transmission gear shaft (8-1) passes through the second wall plate (4-2) and the first wall plate (4-1), the third driving gear (8-2) is arranged outside the first wall plate (4-1) and matched with the second driven gear (7-3), and the third driven gear (8-3) is arranged outside the second wall plate (4-2) and engaged with the fourth driving gear (15-2); the fourth gear shaft (15) is in two sets and arranged on both sides of the third driven gear (8-3) and outside the second wall plate (4-2); the sprocket shaft (16) is sleeved on the third transmission gear shaft (8-1), and an axle gear (16-1) is arranged on the end of the sprocket shaft (16) extending outside the second wall plate (4-2), and the axle gear (16-1) is engaged with the fourth driven gears (15-3) on both sides.

8. A motorized round link tightener as defined in claim 7 wherein, The driving mechanism comprises a chain guide box (17) arranged below the second wall plate (4-2) and the first wall plate (4-1) and a sprocket (18) arranged in the chain guide box (17); the sprocket (18) is fixedly connected with the sprocket shaft (16), and the sprocket (18) and the sprocket shaft (16) are both sleeved on the third transmission gear shaft (8-1); the endless chain (3) is arranged on the sprocket (18), and its outside is limited by the chain guide box (17).

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