Electric loop chain tightener

Abstract

The utility model discloses an electric loop chain tightener, which is suitable for the fields of electric power, communication, construction and the like and is used for realizing efficient and accurate tensioning and traction of a loop chain. The tightener comprises an upper lifting hook assembly, a lower lifting hook assembly, a loop chain and a tightener body, wherein a transmission system, an electric driving mechanism, a neutral gear switching mechanism, an electric cabinet and a shell are arranged in the tightener body. The automatic aligning and meshing device is characterized in that the shifting fork limiting rod and the adjusting mechanism are controlled through the adjusting hand wheel, automatic aligning and meshing between the second driving gear and the first transmission gear are achieved, and operation convenience and meshing precision are improved. The system has an electric and manual flexible switching function, and a microswitch is arranged to realize power supply on-off linkage control, so that misoperation is prevented. And a multi-stage gear structure, a high-strength loop chain and an optimized sliding connection design are adopted, so that the load capacity, durability and safety of the whole machine are enhanced. The system is compact in structure, high in integration level, capable of remarkably improving user operation experience and equipment reliability, and suitable for various complex construction scenes.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of wire strainer, especially relates to an electric ring chain wire strainer. BACKGROUND

[0002] The electric ring chain wire strainer is a mechanical tool for realizing ring chain tensioning or traction through electric drive, mainly used for efficient and accurate tension adjustment or lifting operation of cable, rope or ring chain in power, communication, construction and other industries. Early wire strainers rely on manpower (such as manual wrench) or hydraulic drive, which is low in efficiency and high in labor intensity, especially difficult to meet the operation demand of high strength and high precision in high-voltage transmission line and large-scale engineering. With the development of industrial automation, electric tools gradually replace traditional tools. The electric ring chain wire strainer combines motor drive and ring chain transmission technology, realizing higher load capacity, controllability and operation convenience. It is mainly used for wire tensioning, replacement of insulators, overhead wiring and tension adjustment of optical fibers and cables in communication construction, hoisting of steel structures, installation of cableways or tensioning of bridge cables in construction and bridge, positioning of large equipment, cargo binding and fixing in shipbuilding and heavy industry.

[0003] The existing electric ring chain wire strainer generally includes an electric drive system, a ring chain transmission mechanism and a control system, wherein the electric drive system is internally provided with a motor (usually a DC or AC motor) which outputs high torque through a reduction mechanism to drive the ring chain to move. The ring chain transmission mechanism adopts high-strength alloy steel ring chain, realizes linear traction through sprocket meshing, and has flexibility and load capacity (common load range 1-20 tons). The control system is equipped with an electronic controller, overload protection and wireless remote control functions, supporting precise tension adjustment (such as setting a preset tension value) and emergency braking. The existing electric ring chain wire strainer has manual and automatic integrated operation functions, and has the characteristics of fast ring chain extraction in neutral position and manual operation function.

[0004] The patent application with the application publication number 118487166A and the patent application name Electric Ring Chain Wire Strainer discloses an electric ring chain wire strainer to solve the problem of easy pollution of the wire strainer. The patent application file specification sheet paragraph

[0104] records: "In this embodiment, by pulling the second transmission shaft 154 and sliding the limiting block 27 on the second transmission shaft 154 through the limiting slot 261 on the positioning piece 26, and rotating the second transmission shaft 154, the second transmission shaft 154 is locked in a position, and in this process, the third transmission gear 156 will be separated from the first transmission piece 157 and the second transmission piece 158, and the return spring 23 will be compressed, and at the same time the ratchet 18 will be separated from the first ratchet piece 19 and the second ratchet piece 20, at this time the rotation direction of the driving disc 113 and the third transmission piece 159 is not limited, and the length of the ring chain 16 can be adjusted at will according to the need."

[0005] In the above electric ring chain tightener, the second transmission shaft 154 of the electric ring chain tightener pushes and pulls the third transmission gear 156 to engage or disengage with the first transmission member 157 and the second transmission member 158. Although it can ensure that the rotation direction of the driving plate 113 and the third transmission member 159 is not limited, the gap between the third transmission gear 156 and the first transmission member 157 and the second transmission member 158 is relatively large, which affects the service life of the gear; at the same time, when the third transmission gear 156 is pushed and pulled by the second transmission shaft 154, the second transmission shaft 154 needs to be locked, which is quite inconvenient to operate, especially when the third transmission gear 156 is engaged with the first transmission member 157 and the second transmission member 158, the teeth of the third transmission gear 156 are easily resisted by the teeth of the first transmission member 157 and the second transmission member 158, which is not convenient for the engagement of the third transmission gear 156 with the first transmission member 157 and the second transmission member 158, so that it needs to be adjusted constantly to engage.

[0006] In summary, after the existing electric ring chain tightener is used to pull the ring chain to the appropriate position in the neutral position, the meshing teeth will also rotate to a random position during the pulling process, resulting in misalignment of the reset teeth. The existing structure needs to be rotated to open the reset switch or knob, and the ring chain or rotating gear is manually adjusted to align, which is inconvenient to operate and reduces the user experience. Utility model content

[0007] The utility model solves the technical problem of the existing electric ring chain tightener, provides an electric ring chain tightener which is convenient to use, prolongs the service life, and is especially convenient for the teeth of gears to align and engage each other and reduces the wear of the teeth when switching automatically or manually in the neutral position.

[0008] To achieve the above purpose, the technical scheme of the utility model is as follows:

[0009] An electric ring chain tightener, comprising an upper hook assembly, a lower hook assembly, a ring chain and a tightener main body, the ring chain is arranged between the upper hook assembly and the lower hook assembly and passes through the tightener main body, and the tightener main body is arranged on the upper hook assembly, characterized in that the tightener main body comprises a transmission system, a driving mechanism for driving the ring chain, a switching mechanism for switching the electric ring chain tightener to the neutral position, an electric control box and a shell.

[0010] The shell comprises a first wall plate and a second wall plate fixed on both sides of the upper hook assembly, a front cover arranged outside the first wall plate and a rear cover arranged outside the second wall plate.

[0011] The driving mechanism is arranged below the second wall plate and the first wall plate.

[0012] The transmission system comprises a motor arranged outside the second wallboard, a first gear shaft connected with the output shaft of the motor, a second gear shaft matched with the first gear shaft, and a transmission mechanism matched with the second gear shaft and driving the driving ring chain of the driving mechanism; the first gear shaft comprises a first transmission gear shaft and a first transmission gear, and the second gear shaft comprises a second transmission gear shaft parallel to the first transmission gear shaft, a second driving gear and a second driven gear;

[0013] The switching mechanism comprises a shift lever limiting rod arranged in parallel with the second transmission gear shaft, a compression spring sleeved on the shift lever limiting rod and a shift fork, an adjusting hand wheel arranged at one end of the shift lever limiting rod and an adjusting mechanism arranged at the other end of the shift lever limiting rod; the adjusting mechanism comprises a first adjusting gear, a sleeve rotatably arranged on the central axis of the first adjusting gear, a top rod arranged in the sleeve and a return spring below the top rod; the adjusting mechanism is arranged between the second wallboard and the first wallboard, and the first adjusting gear is arranged on the side close to the first wallboard; the shift lever limiting rod penetrates through the front cover and the first wallboard and is in abutment with the end of the top rod and is arranged coaxially with the top rod in the sleeve, a recess is arranged on the front cover, the end of the shift lever limiting rod extends out of the recess, the adjusting hand wheel is movably sleeved on the part of the shift lever limiting rod extending out of the front cover and is limited by the part, the adjusting hand wheel is arranged in the recess and is threadedly matched with the recess; the shift fork is arranged on the shift lever limiting rod in the first wallboard and the front cover, a limiting seat is arranged on the shift lever limiting rod on the side close to the first wallboard, the compression spring is arranged between the adjusting hand wheel and the shift fork, and the shift fork is in abutment with the limiting seat through the compression spring;

[0014] The second gear shaft further comprises a second adjusting gear, the second adjusting gear is arranged between the second wallboard and the first wallboard and is in mesh with the first adjusting gear; the second driving gear and the second driven gear are arranged in the first wallboard and the front cover, the second driven gear is matched with the transmission mechanism, the second driving gear is sleeved on the second transmission gear shaft, the second transmission gear shaft is provided with external splines on the side close to the first wallboard, and the second driving gear is provided with internal splines and is matched with the second transmission gear shaft;

[0015] The second driving gear is provided with an annular groove coaxial with the second transmission gear shaft on the side away from the first wallboard, and the opening of the annular groove is arranged in the radial direction of the second driving gear; the shift fork comprises a shift fork body sleeved on the shift lever limiting rod and a shift fork head arranged in the radial direction of the shift fork fixing rod, the shift fork body is limited by the limiting seat, the shift fork head is deeply arranged in the annular groove and is in sliding connection with the annular groove; the first transmission gear is arranged on the side close to the first wallboard and is matched with the second driving gear;

[0016] A positioning pin is arranged on the top rod in the radial direction thereof, and an arc-shaped waist hole through which the positioning pin passes is arranged on the side wall of the sleeve; the arc-shaped waist hole and the radial surface of the sleeve form an included angle;

[0017] By rotating the adjusting handwheel, the shift fork limit rod is moved, and the shift fork limit rod abuts against the top rod, moving along the sleeve axially. This forces the first adjusting gear to rotate through the positioning pin. Under the action of the compression spring of the adjusting handwheel, the second driving gear is pressed and partially engaged with the second transmission gear shaft through the spline. At the same time, the second driving gear is adjusted by rotating the second adjusting gear to align with the first transmission gear until they are engaged. By adjusting the handwheel, the shift fork limit rod moves forward and outward, thereby causing the shift fork to drive the second driving gear to separate from the first transmission gear.

[0018] Preferably, balls that slide along an annular groove are provided on both sides of the shift fork head, and a ball groove that limits the balls is provided on the shift fork head.

[0019] Furthermore, the adjusting handwheel includes an adjusting nut and an adjusting screw, the adjusting screw being threaded into the groove; an annular step is formed on the periphery of the end of the shift fork limiting rod extending out of the front cover, and a limiting part is formed from the step surface of the annular step to the free end of the shift fork limiting rod, limiting the adjusting handwheel on the shift fork limiting rod; an annular limiting groove is formed on the limiting part, and a limiting retaining ring is provided in the annular limiting groove, the limiting retaining ring being provided on the outside of the adjusting nut; the adjusting screw is provided on one side of the step surface of the annular step, and the adjusting handwheel is movably sleeved on the limiting part between the limiting retaining ring and the step surface of the annular step; the compression spring passes through the front cover and abuts against the end face of the adjusting screw.

[0020] Furthermore, the length of the adjusting screw is greater than the depth of the groove.

[0021] Furthermore, the first transmission gear shaft is respectively limited to the first wall plate and the front cover by bearings; the second transmission gear shaft is respectively limited to the first wall plate and the front cover by bearings; the sleeve is limited between the second wall plate and the first wall plate by bearings.

[0022] Preferably, a micro switch for switching the main power supply of the electric chain tensioner is provided on the front cover. The contact of the micro switch is located near the side of the shift fork body. A contact sliding surface that cooperates with the contact is provided along the axis of the shift fork limit rod on the side of the shift fork body near the contact. The contact sliding surface includes an inclined surface near the first wall plate and a plane connected to the inclined surface. When the contact slides on the inclined surface or does not contact the contact sliding surface, the main power supply of the electric chain tensioner is de-energized. When the contact slides or stays on the plane, the main power supply of the electric chain tensioner is energized.

[0023] Furthermore, the second transmission gear shaft extends out of the front cover on one side of the front cover, and the portion extending out of the front cover constitutes the manual operation part of the manual control chain.

[0024] Furthermore, the transmission mechanism includes a third gear shaft, a fourth gear shaft cooperating with the third gear shaft, and a sprocket shaft cooperating with the fourth gear shaft; the third gear shaft includes a third transmission gear shaft parallel to the second transmission gear shaft, a third driving gear cooperating with the second driven gear, and a third driven gear 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 located outside the first wall plate and meshes with the second driven gear, and the third driven gear is located outside the second wall plate and meshes with the fourth driving gear; there are two sets of fourth gear shafts, respectively located on both sides of the third driven gear, both located outside the second wall plate; the sprocket shaft is sleeved on the third transmission gear shaft, and a shaft gear is provided on the end of the sprocket shaft extending outside the second wall plate, the shaft gear meshing with the fourth driven gears on both sides.

[0025] Furthermore, 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 the sprocket shaft, and both the sprocket and the sprocket shaft are sleeved on the third transmission gear shaft; the ring chain is wound around the sprocket, and its outer side is restricted by the chain guide box.

[0026] Furthermore, a ratchet structure for braking is also fitted on the third transmission gear shaft, and the ratchet mechanism is located on the outside of the first wall plate.

[0027] Working principle of this electric chain tensioner:

[0028] 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. By adjusting the handwheel and engaging the groove on the front cover, the shift fork limit rod is pulled outward. The shift fork limit rod drives the shift fork to move, which in turn drives the second drive gear to separate from the first transmission gear. The motor idles, and the second transmission gear shaft is manually controlled to rotate, thereby sequentially driving the third transmission gear shaft, the fourth transmission gear shaft, the sprocket shaft, and the sprocket to rotate. This allows for manual control of chain tightening and loosening. The rotation of the second transmission gear shaft can be controlled using a socket wrench or a hand drill combined with a socket wrench and the manual operating mechanism. At this time, the locating pin on the top rod is at the end of the arc-shaped waist hole away from the return spring.

[0029] When switching to automatic motor-driven chain tensioning, the handwheel is screwed into the groove on the front cover, causing the fork limit rod to press against the push rod inside the sleeve. The positioning pin on the push rod engages with the arc-shaped waist hole on the sleeve, which is angled to the radial end face of the sleeve. During the push rod's movement, the positioning pin moves from the end of the arc-shaped waist hole away from the return spring to the end closer to the return spring, thus forcing the sleeve and the first adjusting gear to rotate. The first adjusting gear drives the second adjusting gear to rotate. During the movement of the fork limit rod, the fork, under the action of the compression spring, drives the second drive gear to approach and abut against the first transmission gear. The contact between the second drive gear and the first transmission gear does not affect the continued movement of the fork limit rod. The movement of the fork limit rod controls the rotation of the second drive gear. When the second drive gear and the first transmission gear are in the meshing position, the second drive gear continues to move and mesh with the first transmission gear, thereby controlling the electric chain tensioner via the motor.

[0030] The beneficial effects of this electric chain tensioner are:

[0031] 1. Improved ease of operation: The automatic / manual switching between neutral and engaged states is achieved by setting an adjustment handwheel in conjunction with the shift fork limit lever. Users do not need to manually align the gear position, which greatly simplifies the operation process and improves ease of use.

[0032] 2. Precise gear meshing: The second drive gear adopts a spline connection and a double-adjustable gear transmission structure, which can realize the automatic alignment of the second drive gear and the first transmission gear, avoid gear misalignment and interference, and improve meshing accuracy.

[0033] 3. Extend service life: A reasonable gear meshing mechanism reduces abnormal friction and wear between gear teeth, enhances gear durability, and extends the overall service life of the equipment.

[0034] 3. Flexible switching between electric and manual operation: Supports manual operation in situations where there is no power, such as power failure, motor failure, or the need for rapid chain pulling, improving the adaptability and reliability of the tensioner.

[0035] 4. Enhanced safety: By setting a micro switch in conjunction with the position of the shift fork, the main power supply can be automatically switched on and off, ensuring that the power is disconnected when the gears are not fully engaged, preventing misoperation and damage, and improving safety during use.

[0036] 5. Compact structure and high integration: The overall structure is reasonably designed, the layout of each component is compact, and the drive system, transmission system and control system are integrated, which is conducive to industrial production and later maintenance.

[0037] 6. Enhanced user experience: During adjustment, the shift fork head slides into the annular groove and is supplemented by a ball bearing structure to reduce frictional resistance, making the switching process smoother and the operation easier.

[0038] 7. High load adaptability: The transmission system adopts a multi-stage gear structure and a high-strength ring chain, which has a large load capacity and can adapt to a variety of high-intensity working environments. Attached Figure Description

[0039] A brief explanation of the contents of each figure in the instruction manual and the markings in the figures is provided:

[0040] Figure 1 A perspective view of the electric chain tensioner as an example;

[0041] Figure 2 for Figure 1 A schematic diagram of the electric chain tensioner after removing the front cover and the first wall panel;

[0042] Figure 3 for Figure 2 3D view of an electric chain tensioner;

[0043] Figure 4 for Figure 3 A 3D view of the electric chain tensioner after it has rotated;

[0044] Figure 5 This is a perspective view of the electric chain tensioner after removing the housing, as shown in the embodiment.

[0045] Figure 6 This is a front view of the electric chain tensioner in an embodiment.

[0046] Figure 7 for Figure 6 Sectional view at point AA;

[0047] Figure 8 for Figure 6 Sectional view at point BB;

[0048] Figure 9 for Figure 8 Enlarged view at point D;

[0049] Figure 10 for Figure 8 Enlarged view at point E in the middle;

[0050] Figure 11 for Figure 6 Sectional view at CC;

[0051] Figure 12 This is a schematic diagram of the electric chain tensioner with the second drive gear and the first transmission gear in a separated state.

[0052] Figure 13 This is a schematic diagram of the adjustment mechanism;

[0053] Figure 14This is a schematic diagram illustrating the meshing process between the second driving gear and the first transmission gear in an embodiment.

[0054] In the picture:

[0055] 1 is the upper hook assembly;

[0056] 2 is the lower hook assembly;

[0057] 3 represents a ring chain;

[0058] 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;

[0059] 5 represents the motor;

[0060] 6 is the first gear shaft; 6-1 is the first transmission gear shaft; 6-2 is the first transmission gear;

[0061] 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 second adjusting gear; 7-5 is the annular groove; 7-6 is the manual operation part;

[0062] 8 is the shift fork limit rod; 8-1 is the limit seat; 8-2 is the annular step; 8-3 is the annular limit groove; 8-4 is the limit retaining ring;

[0063] 9 represents a compression spring;

[0064] 10 is the shift fork; 10-1 is the shift fork body; 10-2 is the shift fork head; 10-3 is the ball bearing; 10-4 is the inclined plane; 10-5 is the flat plane;

[0065] 11 is the adjusting handwheel; 11-1 is the adjusting nut; 11-2 is the adjusting screw;

[0066] 12 is the adjusting mechanism; 12-1 is the first adjusting gear; 12-2 is the sleeve; 12-3 is the push rod; 12-4 is the return spring; 12-5 is the positioning pin; 12-6 is the arc-shaped waist hole;

[0067] 13 is a micro switch;

[0068] 14 is the third gear shaft; 14-1 is the third transmission gear shaft; 14-2 is the third driving gear; 14-3 is the third driven gear;

[0069] 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;

[0070] 16 is the sprocket shaft; 16-1 is the shaft gear;

[0071] 17 is the chain guide box;

[0072] 18 represents a sprocket;

[0073] 19 is a ratchet structure. Detailed Implementation

[0074] 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. Example

[0075] like Figure 1 , 6 As shown, an electric chain tensioner includes an upper hook assembly 1, a lower hook assembly 2, a chain 3, and a tensioner body. The chain 3 is wound between the upper hook assembly 1 and the lower hook assembly 2 and passes through the tensioner body, which is mounted on the upper hook assembly 1. The tensioner body includes a transmission system, a drive mechanism for driving the chain 3, a switching mechanism for switching the electric chain tensioner to neutral, an electrical control box, and a housing 4. The housing 4 includes a second wall plate 4-2 and a first wall plate 4-1 fixed on both sides of the upper hook assembly 1, and a rear cover 4-4 disposed on the outside of the first wall plate 4-1 and a front cover 4-3 disposed on the outside of the second wall plate 4-2.

[0076] like Figure 2 , 3 As shown in Figures 4 and 5, the transmission system 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, and a transmission mechanism cooperating with the second gear shaft 7 and driving the drive mechanism to drive the chain 3; the second transmission gear shaft 7-1 extends out of the front cover 4-3 on one side of the front cover 4-3, and the part extending out of the front cover 4-3 constitutes the manual operation part 7-6 of the manual control chain 3; the first gear shaft 6 includes a first transmission gear shaft 6-1 and a first transmission gear 6-2, and 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.

[0077] like Figure 3 , 4As shown in Figures 5 and 8, the switching mechanism includes a shift fork limiting rod 8 arranged parallel to the second transmission gear shaft 7-1, a compression spring 9 and a shift fork 10 sleeved on the shift fork limiting rod 8, an adjusting handwheel 11 at one end of the shift fork limiting rod 8, and an adjusting mechanism 12 at the other end; the adjusting mechanism 12 includes a first adjusting gear 12-1, a sleeve 12-2 rotatable on the central axis of the first adjusting gear 12-1, a push rod 12-3 disposed inside the sleeve 12-2, and a return spring 12-4 below the push rod 12-3; the adjusting mechanism 12 is disposed between the second wall plate 4-2 and the first wall plate 4-1, and the first adjusting gear 12-1 is disposed on the side closer to the first wall plate 4-1; the shift fork limiting rod 8 passes through the front The cover 4-3 and the first wall plate 4-1 abut against the end of the top rod 12-3 and are coaxially arranged with the top rod 12-3 inside the sleeve 12-2. A groove is provided on the front cover 4-3, and the end of the shift fork limiting rod 8 extends out of the groove. The adjusting handwheel 11 is movably sleeved and limited on the part of the shift fork limiting rod 8 that extends out of the front cover 4-3. The adjusting handwheel 11 is set in the groove and threadedly engaged with the groove. The shift fork 10 is set on the shift fork limiting rod 8 inside the first wall plate 4-1 and the front cover 4-3. A limiting seat 8-1 is provided on the shift fork limiting rod 8 on the side near the first wall plate 4-1. A compression spring 9 is set between the adjusting handwheel 11 and the shift fork 10. The shift fork 10 abuts against the limiting seat 8-1 through the compression spring 9.

[0078] like Figure 8 , 9 As shown, the adjusting handwheel 11 includes an adjusting nut 11-1 and an adjusting screw 11-2. The adjusting screw 11-2 is threaded into the groove, and the length of the adjusting screw 11-2 is greater than the depth of the groove. An annular step 8-2 is provided on the outer periphery of the end of the shift fork limiting rod 8 that extends out of the front cover 4-3. The step surface of the annular step 8-2 to the free end of the shift fork limiting rod 8 constitutes a limiting part that limits the adjusting handwheel 11 on the shift fork limiting rod 8. An annular step 8-2 is provided on the limiting part. The limiting groove 8-3 has a limiting retaining ring 8-4 inside it. The limiting retaining ring 8-4 is a C-shaped retaining ring. The limiting retaining ring 8-4 is located on the outside of the adjusting nut 11-1. The adjusting screw 11-2 is located on one side of the step surface of the annular step 8-2. The adjusting handwheel 11 is movably sleeved on the limiting part between the limiting retaining ring 8-4 and the step surface of the annular step 8-2. The compression spring 9 passes through the front cover 4-3 and abuts against the end face of the adjusting screw 11-2.

[0079] like Figure 5 , 7As shown in Figures 8 and 12, the second gear shaft 7 also includes a second adjusting gear 7-4, which is disposed between the second wall plate 4-2 and the first wall plate 4-1 and meshes with the first adjusting gear 12-1; the second driving gear 7-2 and the second driven gear 7-3 are disposed within the first wall plate 4-1 and the front cover 4-3, the second driven gear 7-3 cooperates with the transmission mechanism, and the second driving gear 7-2 is sleeved on the second transmission gear shaft 7-1. The second transmission gear shaft 7-1 has an external spline on the side near the first wall plate 4-1. 2. An internal spline is provided and engages with the second transmission gear shaft 7-1; the second drive gear 7-2 has an annular groove 7-5 coaxial with the second transmission gear shaft 7-1 on the side away from the first wall plate 4-1, and the opening of the annular groove 7-5 is radially arranged along the second drive gear 7-2; the shift fork 10 includes a shift fork body 10-1 sleeved on the shift fork limiting rod 8 and a shift fork head 10-2 radially arranged along the shift fork 10 fixing rod, the shift fork body 10-1 is limited on the limiting seat 8-1, and the shift fork head 10-2 extends into the annular groove 7-5 and is slidably connected to the annular groove 7-5, such as... Figure 10 As shown, ball bearings 10-3 are respectively provided on both sides of the shift fork head 10-2, sliding along the annular groove 7-5, and a ball bearing groove 10-3 is provided on the shift fork head 10-2 to limit the ball bearings 10-3; the first transmission gear 6-2 is provided on the side near the first wall plate 4-1 and cooperates with the second drive gear 7-2; as shown Figure 13 As shown, a locating pin 12-5 is provided on the top rod 12-3 along its radial direction, and an arc-shaped waist hole 12-6 through which the locating pin 12-5 passes is provided on the side wall of the sleeve 12-2; the arc-shaped waist hole 12-6 forms an angle with the radial surface of the sleeve 12-2.

[0080] like Figure 5 , 7As shown in Figure 11, the transmission mechanism includes a third gear shaft 14, a fourth gear shaft 15 cooperating with the third gear shaft 14, and a sprocket shaft 16 cooperating with the fourth gear shaft 15; the third gear shaft 14 includes a third transmission gear shaft 14-1 parallel to the second transmission gear shaft 7-1, a third driving gear 14-2 cooperating with the second driven gear 7-3, and a third driven gear 14-3 cooperating 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 14-1, a fourth driving gear 15-2 cooperating with the third driven gear 14-3, and a sprocket shaft 16 cooperating with the sprocket shaft 16. The fourth driven gear 15-3 is engaged; the third transmission gear shaft 14-1 passes through the second wall plate 4-2 and the first wall plate 4-1, the third driving gear 14-2 is located outside the first wall plate 4-1 and meshes with the second driven gear 7-3, the third driven gear 14-3 is located outside the second wall plate 4-2 and meshes with the fourth driving gear 15-2; the fourth gear shaft 15 consists of two sets, respectively located on both sides of the third driven gear 14-3, both located outside the second wall plate 4-2; the sprocket shaft 16 is sleeved on the third transmission gear shaft 14-1, and a shaft gear 16-1 is provided on the end of the sprocket shaft 16 extending outside the second wall plate 4-2, the shaft gear 16-1 meshes with the fourth driven gears 15-3 on both sides.

[0081] like Figure 7 As shown, the drive mechanism is located below the second wall panel 4-2 and the first wall panel 4-1; the drive mechanism includes a chain guide box 17 located below the second wall panel 4-2 and the first wall panel 4-1 and a sprocket 18 located inside 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 14-1; the ring chain 3 is wound around the sprocket 18, and its outer side is restricted by the chain guide box 17.

[0082] like Figure 8 , 12 As shown, a micro switch 13 for switching the main power supply of the electric chain tensioner is provided on the front cover 4-3. The contact of the micro switch 13 is located near the side of the shift fork body 10-1. A contact sliding surface that cooperates with the contact is provided on the side of the shift fork body 10-1 near the contact along the axis of the shift fork limiting rod 8. The contact sliding surface includes an inclined surface 10-4 near the first wall plate 4-1 and a plane 10-5 connected to the inclined surface 10-4. When the contact slides on the inclined surface 10-4 or does not contact the contact sliding surface, the main power supply of the electric chain tensioner is de-energized. When the contact slides or stays on the plane 10-5, the main power supply of the electric chain tensioner is energized.

[0083] like Figure 7 , 8As shown in Figures 11 and 12, the first transmission gear shaft 6-1 is respectively fixed on the first wall plate 4-1 and the front cover 4-3 by bearings; the second transmission gear shaft 7-1 is respectively fixed on the first wall plate 4-1 and the front cover 4-3 by bearings; the sleeve 12-2 is fixed between the second wall plate 4-2 and the first wall plate 4-1 by bearings. A ratchet structure 19 for braking is also sleeved on the third transmission gear shaft 14-1, and the ratchet structure 19 is located on the outside of the first wall plate 4-1.

[0084] When the electric chain tensioner of this embodiment is used under normal electric control, such as Figure 8 , 9 As shown, the second drive gear 7-2 is engaged with the second transmission gear shaft 7-1 via a spline and meshes with the first transmission gear 6-2. The motor 5 drives the first transmission gear shaft 6-1 to rotate, and the first transmission gear shaft 6-1 drives the second transmission gear shaft 7-1 to rotate. The second transmission gear shaft 7-1 sequentially drives the third transmission gear shaft 14-1, the fourth transmission gear shaft 15-1 and the sprocket shaft 16 to rotate, thereby driving the sprocket 18 to rotate, thus winding and unwinding the ring chain 3.

[0085] When the electric chain tensioner needs to quickly retract chain 3, or when the battery is dead, or when motor 5 malfunctions, the electric chain tensioner should be set to neutral, and the retraction and extension of chain 3 should be manually controlled. Figure 12 As shown, rotating the adjusting handwheel 11 counterclockwise causes it to rotate outward from the groove, moving the fork limiting rod 8 outward from the front cover 4-3. The limiting seat 8-1 on the fork limiting rod 8 moves the fork 10 away from the first wall plate 4-1. The fork 10 then drives the second driving gear 7-2 to move along the second transmission gear shaft 7-1, separating the second driving gear 7-2 from the first transmission gear 6-2. The second driving gear 7-2 and the second transmission gear shaft 7-1 are splined and can slide freely axially, thus breaking the transmission chain. At this time, the micro switch 13... When activated, the contact of the micro switch 13 enters from the plane 10-5 on the shift fork 10 to the inclined surface 10-4 of the shift fork 10, cutting off power to the motor 5. At this time, the operating handle cannot control the rotation of the motor 5 to prevent misoperation. The manual operating part 7-6 extending from the front cover 4-3 on the second transmission gear shaft 7-1 is generally an external hexagonal structure. It can be driven to rotate by a socket wrench with an internal hexagonal socket or a socket drill with an internal hexagonal socket, thereby controlling the sprocket 18 to quickly pull the ring chain 3 to the appropriate position.

[0086] When the electric chain tensioner of this embodiment needs to be switched to automatic drive of the motor 5 to wind up and unwind the chain 3, in this state, the adjusting handwheel 11 is rotated clockwise. The adjusting nut 11-1 on the adjusting handwheel 11 is tightened into the groove on the front cover 4-3. The adjusting screw 11-2, through the annular step 8-2 on the fork limiting rod 8, presses the fork limiting rod 8 to move inward into the front cover 4-3. Simultaneously, the adjusting screw 11-2 compresses the compression spring 9 and the fork 10, causing them to move towards the first wall plate 4-1. Figure 14 As shown in state A, the shift fork 10 drives the second drive gear 7-2 to move towards the first transmission gear 6-2. However, the meshing teeth of the first drive gear and the first transmission gear 6-2 are in random positions. There is a high probability that the teeth of the first drive gear and the first transmission gear 6-2 are not exactly in the opposite meshing position. Figure 12 As shown, the teeth of the second driving gear 7-2 abut against the teeth of the first transmission gear 6-2, but they cannot engage at this time; Figure 13 As shown, while the shift fork limiting rod 8 moves, it abuts against the top rod 12-3 of the adjusting mechanism 12, compressing the return spring 12-4 inside the sleeve 12-2. During the movement of the top rod 12-3, the positioning pin 12-5 on the top rod 12-3 moves from the top of the arc-shaped waist hole 12-6 to the bottom of the arc-shaped waist hole 12-6. The positioning pin 12-5 moves linearly. During the movement of the positioning pin 12-5, the positioning pin 12-5 and the arc-shaped waist hole 12-6 cooperate to force the sleeve 12-2 to rotate. Since the sleeve 12-2 and the first adjusting gear 12-1 are coaxially fixed, the first adjusting gear 12-1 drives the second adjusting gear 7-4 to rotate, and the second adjusting gear 7-4 drives the second driving gear 7-2 to rotate. The first driving gear and the shift fork 10 are slidably connected, so the rotation of the second driving gear 7-2 is not affected. Therefore, when the second driving gear 7-2 moves toward contact with the first driving gear, including when it contacts it, the second driving gear 7-2 is in a rotating state. Meanwhile, during the movement of the fork limit rod 8, the contact of the micro switch 13 is on the inclined surface 10-4 of the fork 10, and the electric chain tensioner is in a de-energized state.

[0087] After the second drive gear 7-2 abuts against the first transmission gear 6-2, the locating pin 12-5 inside the sleeve 12-2 is located in the middle of the arc-shaped waist hole 12-6 of the sleeve 12-2. Since the second drive gear 7-2 is controlled by the adjusting screw 11-2, the compression spring 9, and the shift fork 10, it does not affect the movement of the shift fork limiting rod 8. The adjusting handwheel 11 continues to rotate clockwise, driving the shift fork limiting rod 8 to continue moving. The shift fork limiting rod 8 drives the push rod 12-3 to continue moving, and the locating pin 12-5 on the push rod 12-3 continues to move towards the bottom of the arc-shaped waist hole 12-6 on the sleeve 12-2. The first adjusting gear 12-1 drives the second adjusting gear 7-4 to continue rotating, simultaneously driving the second drive gear 7-2 to continue rotating. Figure 14As shown in state B, when the second drive gear 7-2 and the first transmission gear 6-2 are in the meshing position, the second drive gear 7-2 quickly meshes with the first gear under the action of the compression spring 9 and the shift fork 10. At this time, the positioning pin 12-5 reaches the bottom of the arc-shaped waist hole 12-6, and the adjusting screw 11-2 of the adjusting handwheel 11 also reaches the bottom of the groove on the front cover 4-3. Stopping the rotation of the adjusting handwheel 11 will achieve the meshing of the second drive gear 7-2 and the first transmission gear 6-2. At this time, the contact of the micro switch 13 also slides from the inclined surface 10-4 of the shift fork 10 to the flat surface 10-5 of the shift fork 10. At this time, the electric chain tensioner is energized, and the motor 5 can be rotated by controlling the handle or the wireless controller.

[0088] After controlling the motor 5 to be energized, as Figure 8 As shown, motor 5 drives the first transmission gear shaft 6-1 to rotate, and the first transmission gear shaft 6-1 drives the second gear shaft to rotate, as... Figure 5 , 7 As shown, the second driven gear 7-3 meshes with the third driving gear 14-2, thereby driving the third transmission gear shaft 14-1 to rotate. The third driven gear 14-3 meshes with the fourth driving gear 15-2, thereby driving the fourth transmission gear shaft 15-1 to rotate. The fourth driven gear 15-3 meshes with the shaft gear 16-1, ultimately driving the sprocket shaft 16 to rotate. The sprocket shaft 16 is fixedly connected to the sprocket 18. The rotation of the sprocket 18 drives the movement of the ring chain 3.

[0089] 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.

[0090] 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 chain tensioner, comprising an upper hook assembly (1), a lower hook assembly (2), a chain (3), and a tensioner body; the chain (3) is wound between the upper hook assembly (1) and the lower hook assembly (2) and passes through the tensioner body, the tensioner body being disposed on the upper hook assembly (1); characterized in that, The main body of the tensioner includes a transmission system, a drive mechanism for the drive chain (3), a switching mechanism for switching the electric chain tensioner to the neutral position, an electrical control box, and a housing (4). The housing (4) includes a first wall panel (4-1) and a second wall panel (4-2) fixed on both sides of the upper hook assembly (1), and a front cover (4-3) disposed on the outside of the first wall panel (4-1) and a rear cover (4-4) disposed on the outside of the second wall panel (4-2). The drive mechanism is located below the second wall panel (4-2) and the first wall panel (4-1); The transmission system 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), and a transmission mechanism cooperating with the second gear shaft (7) and driving the drive mechanism to drive the chain (3); the first gear shaft (6) includes a first transmission gear shaft (6-1) and a first transmission gear (6-2), and 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 switching mechanism includes a shift fork limiting rod (8) arranged parallel to the second transmission gear shaft (7-1), a compression spring (9) sleeved on the shift fork limiting rod (8), a shift fork (10), an adjusting handwheel (11) at one end of the shift fork limiting rod (8), and an adjusting mechanism (12) at the other end; the adjusting mechanism (12) includes a first adjusting gear (12-1), a sleeve (12-2) rotatable on the central axis of the first adjusting gear (12-1), a push rod (12-3) inside the sleeve (12-2), and a return spring (12-4) below the push rod (12-3); the adjusting mechanism (12) is located between the second wall plate (4-2) and the first wall plate (4-1), and the first adjusting gear (12-1) is located on the side closer to the first wall plate (4-1); the shift fork limiting rod (8) passes through the front cover (4-3) and The first wall plate (4-1) abuts against the end of the top rod (12-3) and is coaxially arranged with the top rod (12-3) inside the sleeve (12-2). A groove is provided on the front cover (4-3). The end of the shift fork limiting rod (8) extends out from the groove. The adjusting handwheel (11) is movably sleeved and limited on the part of the shift fork limiting rod (8) that extends out of the front cover (4-3). The adjusting handwheel (11) is arranged in the groove and threadedly engaged with the groove. The shift fork (10) is arranged on the shift fork limiting rod (8) inside the first wall plate (4-1) and the front cover (4-3). A limiting seat (8-1) is provided on the shift fork limiting rod (8) on the side close to the first wall plate (4-1). The compression spring (9) is arranged between the adjusting handwheel (11) and the shift fork (10). The shift fork (10) abuts against the limiting seat (8-1) through the compression spring (9). The second gear shaft (7) further includes a second adjusting gear (7-4), which is disposed between the second wall plate (4-2) and the first wall plate (4-1) and meshes with the first adjusting gear (12-1); the second driving gear (7-2) and the second driven gear (7-3) are disposed inside the first wall plate (4-1) and the front cover (4-3), the second driven gear (7-3) cooperates with the transmission mechanism, the second driving gear (7-2) is sleeved on the second transmission gear shaft (7-1), the second transmission gear shaft (7-1) is provided with an external spline on the side of the second transmission gear shaft (7-1) near the first wall plate (4-1), and the second driving gear (7-2) is provided with an internal spline and cooperates with the second transmission gear shaft (7-1); The second drive gear (7-2) is provided with an annular groove (7-5) coaxial with the second transmission gear shaft (7-1) on the side away from the first wall plate (4-1). The opening of the annular groove (7-5) is arranged radially along the second drive gear (7-2). The shift fork (10) includes a shift fork body (10-1) sleeved on the shift fork limiting rod (8) and a shift fork head (10-2) arranged radially along the shift fork (10) fixing rod. The shift fork body (10-1) is limited on the limiting seat (8-1). The shift fork head (10-2) extends into the annular groove (7-5) and is slidably connected to the annular groove (7-5). The first transmission gear (6-2) is arranged on the side close to the first wall plate (4-1) and cooperates with the second drive gear (7-2). The top rod (12-3) is provided with a positioning pin (12-5) along its radial direction, and the sleeve (12-2) is provided with an arc-shaped waist hole (12-6) through which the positioning pin (12-5) passes; the arc-shaped waist hole (12-6) forms an angle with the radial surface of the sleeve (12-2); By rotating the adjusting handwheel (11), the shift fork limit rod (8) is driven to move. The shift fork limit rod (8) abuts against the top rod (12-3) and moves along the axial direction of the sleeve (12-2) in the sleeve (12-2), thereby forcing the first adjusting gear (12-1) to rotate through the positioning pin (12-5). The second drive gear (7-2) is pressed by the compression spring (9) under the action of the adjusting handwheel (11) to partially mesh with the second transmission gear shaft (7-1) through the spline. At the same time, the second drive gear (7-2) is adjusted to be aligned with the first transmission gear (6-2) by the rotation of the second adjusting gear (7-4) until they are engaged. The fork limit rod (8) is adjusted by the adjusting handwheel (11) to move outward of the front cover (4-3), so that the fork (10) drives the second drive gear (7-2) to separate from the first transmission gear (6-2).

2. The electric chain tensioner as described in claim 1, characterized in that, On both sides of the shift fork head (10-2), there are balls (10-3) that slide along the annular groove (7-5), and on the shift fork head (10-2), there is a ball (10-3) groove that limits the balls (10-3).

3. The electric chain tensioner as described in claim 1, characterized in that, The adjusting handwheel (11) includes an adjusting nut (11-1) and an adjusting screw (11-2). The adjusting screw (11-2) is threaded into the groove. An annular step (8-2) is provided on the periphery of the end of the shift fork limiting rod (8) that extends out of the front cover (4-3). The step surface of the annular step (8-2) to the free end of the shift fork limiting rod (8) constitutes a limiting part that limits the adjusting handwheel (11) on the shift fork limiting rod (8). An annular limiting groove (8-3) is provided on the limiting part. A limiting ring (8-4) is provided in the annular limiting groove (8-3). The limiting ring (8-4) is located on the outside of the adjusting nut (11-1). The adjusting screw (11-2) is located on one side of the step surface of the annular step (8-2). The adjusting handwheel (11) is movably sleeved on the limiting part between the limiting ring (8-4) and the step surface of the annular step (8-2). The compression spring (9) passes through the front cover (4-3) and abuts against the end face of the adjusting screw (11-2).

4. An electric chain tensioner as described in claim 3, characterized in that, The length of the adjusting screw (11-2) is greater than the depth of the groove.

5. An electric chain tensioner as described in claim 1, characterized in that, The first transmission gear shaft (6-1) is respectively fixed on the first wall plate (4-1) and the front cover (4-3) by bearings; the second transmission gear shaft (7-1) is respectively fixed on the first wall plate (4-1) and the front cover (4-3) by bearings; the sleeve (12-2) is fixed between the second wall plate (4-2) and the first wall plate (4-1) by bearings.

6. An electric chain tensioner as described in claim 1, characterized in that, A micro switch (13) for switching the main power supply of the electric chain tensioner is provided on the front cover (4-3). The contact of the micro switch (13) is located near the side of the shift fork body (10-1). A contact sliding surface that cooperates with the contact is provided on the side of the shift fork body (10-1) near the contact along the axis of the shift fork limiting rod (8). The contact sliding surface includes an inclined surface (10-4) near the first wall plate (4-1) and a plane (10-5) connected to the inclined surface (10-4). When the contact slides on the inclined surface (10-4) or does not contact the contact sliding surface, the main power supply of the electric chain tensioner is de-energized. When the contact slides or stays on the plane (10-5), the main power supply of the electric chain tensioner is energized.

7. An electric chain tensioner as described in claim 1, characterized in that, The second transmission gear shaft (7-1) extends out of the front cover (4-3) on one side of the front cover (4-3), and the part extending out of the front cover (4-3) constitutes the manual operation part (7-6) of the manual control chain (3).

8. An electric chain tensioner as described in claim 1, characterized in that, The transmission mechanism includes a third gear shaft (14), a fourth gear shaft (15) cooperating with the third gear shaft (14), and a sprocket shaft (16) cooperating with the fourth gear shaft (15); the third gear shaft (14) includes a third transmission gear shaft (14-1) parallel to the second transmission gear shaft (7-1), a third driving gear (14-2) cooperating with the second driven gear (7-3), and a third driven gear (14-3) cooperating 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 (14-1), a fourth driving gear (15-2) cooperating with the third driven gear (14-3), and a fourth driven gear (15-3) cooperating with the sprocket shaft (16); the third transmission gear shaft (14-1) includes a third ... second transmission gear shaft (7-1), a fourth driving gear (15-2) cooperating with the third driven gear (14-3), and a fourth driven gear (15-3) cooperating with the sprocket shaft (16); the third transmission gear shaft (14-1) includes a third transmission gear shaft (15-1) parallel to the second transmission gear shaft (7-1), a fourth driving gear (15 The shaft (14-1) passes through the second wall plate (4-2) and the first wall plate (4-1). The third driving gear (14-2) is located on the outside of the first wall plate (4-1) and meshes with the second driven gear (7-3). The third driven gear (14-3) is located on the outside of the second wall plate (4-2) and meshes with the fourth driving gear (15-2). There are two sets of the fourth gear shaft (15), which are located on both sides of the third driven gear (14-3) and are located on the outside of the second wall plate (4-2). The sprocket shaft (16) is sleeved on the third transmission gear shaft (14-1). A shaft gear (16-1) is provided on the end of the sprocket shaft (16) that extends out of the second wall plate (4-2). The shaft gear (16-1) meshes with the fourth driven gears (15-3) on both sides.

9. An electric chain tensioner as described in claim 8, characterized in that, The drive mechanism includes a chain guide box (17) located below the second wall panel (4-2) and the first wall panel (4-1), and a sprocket (18) located inside 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 (14-1). The ring chain (3) is wound around the sprocket (18), and its outer side is restricted by the chain guide box (17).

10. An electric chain tensioner as described in claim 8, characterized in that, A ratchet structure (19) for braking is also fitted on the third transmission gear shaft (14-1), and the ratchet structure (19) is located on the outside of the first wall plate (4-1).

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