Electric loop chain tightener

Abstract

The invention 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 invention belongs to the technical field of wire tensioners, and in particular relates to an electric chain wire tensioner. Background Art

[0002] The electric chain tensioner is a mechanical tool that uses electric drive to achieve chain tensioning or pulling. It is mainly used for efficient and accurate tension adjustment or lifting operations of cables, ropes or chains in the power, communication, construction and other industries. Early tensioners relied on manpower (such as manual wrenches) or hydraulic drive, which was inefficient and labor-intensive, especially in high-voltage transmission lines and large-scale projects. It is difficult to meet the high-intensity and high-precision operation requirements. With the development of industrial automation, electric tools are gradually replacing traditional tools. The electric chain tensioner combines motor drive and chain transmission technology to achieve higher load capacity, controllability and ease of operation. It is mainly used for conductor tensioning and replacement of insulators during the installation of high-voltage transmission lines in power projects, overhead wiring and tension adjustment of optical fibers and cables in communication construction, steel structure hoisting, cableway installation or bridge cable tensioning in buildings and bridges, and large-scale equipment positioning and cargo bundling and fixing in ships and heavy industries.

[0003] Existing electric chain tensioners generally include an electric drive system, a chain transmission mechanism, and a control system. The built-in motor (usually a DC or AC motor) in the electric drive system outputs high torque through a reduction mechanism to drive the chain to move. The chain transmission mechanism uses a high-strength alloy steel chain, which achieves linear traction through sprocket engagement, and has both flexibility and load-bearing capacity (common load range 1-20 tons). The control system is equipped with electronic controllers, overload protection, wireless remote control and other functions, supporting precise tension adjustment (such as setting a preset tension value) and emergency braking. The existing electric chain tensioner has manual and automatic integrated operation functions, with the characteristics of quick chain extraction in neutral position and manual gear operation function.

[0004] The application announcement number is 118487166A, and the name of the patent application is an electric chain tensioner. It discloses an electric chain tensioner for solving the problem that the tensioner is easily contaminated. The description of the patent application document in paragraph

[0104] records: "In this embodiment, by pulling the second transmission shaft 154 and sliding the limiting protrusion 27 on the second transmission shaft 154 through the limiting groove 261 on the positioning member 26, and rotating the second transmission shaft 154, the second transmission shaft 154 is locked in a position. In this process, the third transmission tooth 156 will be disengaged from the first transmission member 157 and the second transmission member 158, and the return spring 23 will be compressed. At the same time, the ratchet 18 will also be disengaged from the first thorn member 19 and the second thorn member 20. At this time, the rotation direction of the driving disk 113 and the third transmission member 159 is no longer restricted, and the length of the chain 16 can be adjusted as needed." When the electric chain tensioner is in the neutral position, the second transmission shaft 154 of the electric chain tensioner pushes and pulls the third transmission tooth 156 to engage or disengage with the first transmission member 157 and the second transmission member 158. Although the rotation direction of the driving plate 113 and the third transmission member 159 can be ensured to be unrestricted, the gap between the third transmission tooth 156 and the first transmission member 157 and the second transmission member 158 is relatively large, which will affect the service life of the gear; at the same time, when the third transmission tooth 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 tooth 156 is engaged with the first transmission member 157 and the second transmission member 158, the gear teeth of the third transmission tooth 156 are easily against the gear teeth of the first transmission member 157 and the second transmission member 158 at the same time, which is not convenient for the third transmission tooth 156 to engage with the first transmission member 157 and the second transmission member 158, so it is necessary to constantly adjust to engage.

[0005] In summary, after the existing electric chain tensioner uses the neutral position to pull the chain to the appropriate position, the meshing teeth will also rotate to random positions accordingly during the process of pulling the chain, resulting in misalignment of the reset teeth. The existing structure requires turning on the reset switch or knob, manually adjusting the chain or rotating the gears for manual alignment, which is inconvenient to operate and reduces the user experience. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide an electric chain tensioner which is easy to use and has a longer service life, especially when the neutral position is switched automatically or manually, so that the gear teeth are easily aligned and meshed with each other and the wear of the gear teeth is reduced.

[0007] To achieve the above object, the technical solution of the present invention is as follows: An electric chain tensioner, comprising an upper hook assembly, a lower hook assembly, a chain and a tensioner body; the chain is wound between the upper hook assembly and the lower hook assembly and passes through the tensioner body, and the tensioner body is arranged on the upper hook assembly; the tensioner body comprises a transmission system, a driving mechanism for driving the chain, a switching mechanism for switching the electric chain tensioner to a neutral position, an electric control box and a housing; The housing comprises a first wall panel and a second wall panel fixed on both sides of the upper hook assembly, and a front cover arranged on the outside of the first wall panel and a rear cover arranged on the outside of the second wall panel; The driving mechanism is arranged below between the second wall panel and the first wall panel; The transmission system includes a motor disposed outside the second wall panel, a first gear shaft connected to the output shaft of the motor, a second gear shaft engaged with the first gear shaft, and a transmission mechanism engaged with the second gear shaft and driving the drive mechanism to drive the endless chain; the first gear shaft includes a first transmission tooth shaft and a first transmission gear, and the second gear shaft includes a second transmission tooth shaft parallel to the first transmission tooth shaft, a second driving gear, and a second driven gear; The switching mechanism includes a fork limiting rod disposed parallel to the second transmission tooth shaft, a compression spring and a fork sleeved on the fork limiting rod, an adjusting handwheel disposed at one end of the fork limiting rod and an adjusting mechanism at the other end; the adjusting mechanism includes a first adjusting gear, a sleeve rotatably disposed on the central axis of the first adjusting gear, a push rod disposed in the sleeve, and a return spring below the push rod; the adjusting mechanism is disposed between the second wall panel and the first wall panel, and the first adjusting gear is disposed on the side close to the first wall panel; the fork limiting rod passes through the front cover and the first wall panel and abuts against the end of the push rod and is coaxially disposed with the push rod in the sleeve, a groove is provided on the front cover, and the end of the fork limiting rod extends out from the groove, the adjusting handwheel is movably sleeved and limited on the part of the fork limiting rod extending out of the front cover, the adjusting handwheel is disposed in the groove and is in threaded cooperation with the groove; the fork is disposed on the fork limiting rod in the first wall panel and the front cover, a limiting seat is provided on the fork limiting rod on the side close to the first wall panel, the compression spring is disposed between the adjusting handwheel and the fork, and the fork abuts against the limiting seat through the compression spring; The second gear shaft further includes a second adjusting gear, the second adjusting gear is disposed between the second wall panel and the first wall panel and meshes with the first adjusting gear; the second driving gear and the second driven gear are disposed in the first wall panel and the front cover, the second driven gear is engaged with the transmission mechanism, the second driving gear is sleeved on the second transmission tooth shaft, an external spline is provided on the second transmission tooth shaft on the side close to the first wall panel, and an internal spline is provided on the second driving gear and is engaged with the second transmission tooth shaft; An annular groove coaxial with the second transmission tooth shaft is provided on the side of the second driving gear away from the first wall panel, and the opening of the annular groove is disposed along the radial direction of the second driving gear; the fork includes a fork body sleeved on the fork limiting rod and a fork head disposed along the radial direction of the fork fixing rod, the fork body is limited on the limiting seat, the fork head extends into the annular groove and is slidably connected with the annular groove; the first transmission gear is disposed on the side close to the first wall panel and is engaged with the second driving gear; A positioning pin is provided on the push rod along its radial direction, and an arc-shaped waist hole through which the positioning pin passes is provided on the side wall of the sleeve; the arc-shaped waist hole forms an angle with the radial plane of the sleeve; By rotating the adjusting handwheel to drive the fork limiting rod to move, the fork limiting rod abuts against the ejector rod to move axially along the sleeve in the sleeve, thereby forcing the first adjusting gear to rotate through the positioning pin; the second driving gear is pressed by the adjusting handwheel to compress the compression spring, and the second driving gear is semi-engaged with the second transmission tooth shaft through the spline. At the same time, the second driving gear is rotated through the second adjusting gear to align with the first transmission gear to the meshing position and then engage; by adjusting the handwheel, the fork limiting rod is adjusted to move outwards of the front cover, so that the fork drives the second driving gear to separate from the first transmission gear.

[0008] Preferably, balls sliding along the annular groove are respectively arranged on both sides of the fork head, and a ball groove for limiting the balls is arranged on the fork head.

[0009] Furthermore, the adjusting handwheel includes an adjusting nut and an adjusting screw, and the adjusting screw is in threaded fit with the groove; an annular step is provided on the periphery of the end of the fork limiting rod extending out of the front cover, and a limiting portion for limiting the adjusting handwheel on the fork limiting rod is formed from the step surface of the annular step to the free end of the fork limiting rod. An annular limiting groove is provided on the limiting portion, and a limiting retaining ring is arranged in the annular limiting groove. The limiting retaining ring is arranged outside the adjusting nut, and the adjusting screw is arranged on one side of the step surface of the annular step. The adjusting handwheel is movably sleeved on the limiting portion 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 surface of the adjusting screw.

[0010] Furthermore, the length of the adjusting screw is greater than the depth of the groove.

[0011] Furthermore, the first transmission tooth shaft is respectively limited on the first wallboard and the front cover through bearings; the second transmission tooth shaft is respectively limited on the first wallboard and the front cover through bearings; the sleeve is limited between the second wallboard and the first wallboard through bearings.

[0012] Preferably, a microswitch for switching the total power supply of the electric chain tightener is arranged on the front cover. The contact of the microswitch is arranged on one side close to the fork body. A contact sliding surface for cooperating with the contact is arranged along the axis of the fork limiting rod on one side of the fork body close to the contact. The contact sliding surface includes an inclined surface close to the first wallboard and a plane connected to the inclined surface; when the contact slides on the inclined surface or is not in contact with the contact sliding surface, the total power supply of the electric chain tightener is cut off; when the contact slides or stays on the plane, the total power supply of the electric chain tightener is energized.

[0013] Furthermore, the second transmission tooth shaft penetrates through the front cover on one side of the front cover, and the part penetrating through the front cover constitutes a manual operation part for manually controlling the chain.

[0014] Further, the transmission mechanism includes a third gear shaft, a fourth gear shaft engaged with the third gear shaft, and a sprocket shaft engaged 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 engaged with the second driven gear, and a third driven gear engaged 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 engaged with the third driven gear, and a fourth driven gear engaged with the sprocket shaft; the third transmission gear shaft passes through the second wall panel and the first wall panel, the third driving gear is arranged outside the first wall panel and meshes with the second driven gear, and the third driven gear is arranged outside the second wall panel and meshes with the fourth driving gear; there are two sets of the fourth gear shafts, which are respectively arranged on both sides of the third driven gear and are both arranged outside the second wall panel; the sprocket shaft is sleeved on the third transmission gear shaft, and a shaft gear is arranged at the end of the sprocket shaft extending outside the second wall panel, and the shaft gear meshes with the fourth driven gears on both sides.

[0015] Further, the driving mechanism includes a chain guide box arranged below between the second wall panel and the first wall panel and a sprocket arranged in the chain guide box; the sprocket is fixedly connected with the sprocket shaft, and both the sprocket and the sprocket shaft are sleeved on the third transmission gear shaft; the endless chain is wound around the sprocket, and its outside is restricted by the chain guide box.

[0016] Further, a ratchet structure for braking is also sleeved on the third transmission gear shaft, and the ratchet mechanism is arranged outside the first wall panel.

[0017] The working principle of the electric endless chain tightener of the present invention: When the endless chain of the electric endless chain tightener is too long and needs to quickly retract the endless chain, or when the battery runs out of power, or when the motor has problems, it is necessary to manually control the electric endless chain tightener. By adjusting the cooperation between the handwheel and the groove on the front cover, the fork limit rod is pulled outwards, the fork limit rod drives the fork to move, the fork drives the second driving gear to separate from the first transmission gear, the motor idles, and by manually controlling the rotation of the second transmission gear shaft, the third transmission gear shaft, the fourth transmission gear shaft, the sprocket shaft and the sprocket are driven to rotate in sequence, so as to manually control the winding and unwinding of the endless chain; to control the rotation of the second transmission gear shaft, a socket wrench or a hand drill combined with a socket wrench and a manual operation part can be used; at this time, the positioning pin on the ejector rod is at the end of the arc-shaped waist hole far from the return spring.

[0018] When it is necessary to switch to the automatic drive of the motor to retract and release the chain, the hand wheel is adjusted to screw into the groove on the front cover to drive the shift fork limit rod to press the push rod in the sleeve, and the positioning pin on the push rod cooperates with the arc waist hole on the sleeve, and the arc waist hole is set at an angle to the radial end surface of the sleeve. During the movement of the push rod, the positioning pin moves from the end of the arc waist hole away from the return spring to the end close to the return spring, thereby forcing the sleeve and the first adjusting gear to rotate, and the first adjusting gear drives the second adjusting gear to rotate; during the movement of the shift fork limit rod, the shift fork drives the second driving gear to approach and abut the first transmission gear under the action of the compression spring; when the second driving gear abuts the first transmission gear, it does not affect the continued movement of the shift fork limit rod, and the movement process of the shift fork limit rod controls the rotation of the second driving gear. When the second driving gear is in the meshing position with the first transmission gear, the second driving gear continues to move and meshes with the first transmission gear, and then the electric chain tensioner is controlled by the motor.

[0019] The electric chain tensioner of the present invention has the following beneficial effects: 1. Improved operational convenience: The automatic / manual switching between neutral and engaged states is achieved by setting an adjustment hand wheel in conjunction with the shift fork limit rod. Users do not need to manually align the gear position, which greatly simplifies the operating process and improves ease of use.

[0020] 2. Accurate gear meshing: The second driving gear adopts a spline connection and a double-adjustable gear transmission structure, which can realize automatic alignment of the second driving gear and the first transmission gear, avoid gear misalignment and interference, and improve meshing accuracy.

[0021] 3. Extend service life: Reasonable gear meshing mechanism reduces abnormal friction and wear between gear teeth, enhances the durability of gears, and extends the overall service life of the equipment.

[0022] 3. Flexible switching between electric and manual: supports manual operation without power in scenarios such as power failure, motor failure, or the need for quick chain withdrawal, improving the adaptability and reliability of the tensioner.

[0023] 4. Enhanced safety: By setting the micro switch in conjunction with the fork position, the main power supply can be automatically turned on and off to ensure that the power is disconnected when the gears are not fully engaged, preventing misoperation and damage and improving safety.

[0024] 5. Compact structure and high integration: The overall structure is reasonably designed, the components are compactly arranged, and the drive system, transmission system, and control system are integrated, which is conducive to industrial production and later maintenance.

[0025] 6. Improve user experience: During the adjustment process, the fork head slides with the annular groove and is assisted by a ball structure to reduce friction resistance, making the switching process smoother and easier to operate.

[0026] 7. High load adaptability: The transmission system adopts a multi-stage gear structure and high-strength endless chain, with a large load capacity, suitable for a variety of high-intensity working environments. Brief Description of the Drawings

[0027] Briefly describe the content expressed in each drawing of the specification and the marks in the drawings: Figure 1 It is a perspective view of the electric chain tightener for the embodiment; Figure 2 It is Figure 1 A schematic structural diagram of the electric chain tightener after removing the front cover and the first wallboard; Figure 3 It is Figure 2 A perspective view of the electric chain tightener; Figure 4 It is Figure 3 A perspective view of the electric chain tightener after rotation; Figure 5 It is a perspective view of the electric chain tightener for the embodiment after removing the housing; Figure 6 It is the front view of the electric chain tightener for the embodiment; Figure 7 It is Figure 6 A sectional view taken along line A-A in Figure 8 It is Figure 6 A sectional view taken along line B-B in Figure 9 It is Figure 8 An enlarged view at D in Figure 10 It is Figure 8 An enlarged view at E in Figure 11 It is Figure 6 A sectional view taken along line C-C in Figure 12 It is a schematic structural diagram of the second driving gear and the first transmission gear of the chain electric tightener in a separated state; Figure 13 It is a schematic structural diagram of the adjusting mechanism; Figure 14 It is a schematic diagram of the meshing process of the second driving gear and the first transmission gear for the embodiment; In the figure: 1 is the upper hook assembly; 2 is the lower hook assembly; 3 is the endless chain; 4 is the housing; 4-1 is the first wallboard; 4-2 is the second wallboard; 4-3 is the front cover; 4-4 is the rear cover; 5 is the motor; 6 is the first gear shaft; 6-1 is the first transmission gear shaft; 6-2 is the first transmission gear; 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; 8 is the fork limiting rod; 8-1 is the limiting seat; 8-2 is the annular step; 8-3 is the annular limiting groove; 8-4 is the limiting retaining ring; 9 is the compression spring; 10 is the fork; 10-1 is the fork body; 10-2 is the fork head; 10-3 is the ball; 10-4 is the inclined plane; 10-5 is the flat plane; 11 is the adjusting handwheel; 11-1 is the adjusting nut; 11-2 is the adjusting screw; 12 is the adjusting mechanism; 12-1 is the first adjusting gear; 12-2 is the sleeve; 12-3 is the ejector rod; 12-4 is the return spring; 12-5 is the positioning pin; 12-6 is the arc-shaped waist hole; 13 is the micro switch; 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; 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; 16 is the sprocket shaft; 16-1 is the shaft gear; 17 is the chain guide box; 18 is the sprocket; 19 is the ratchet structure. Specific embodiments

[0028] The following gives a non-limiting embodiment in conjunction with the accompanying drawings to further illustrate the present invention. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the descriptions of well-known structures and technologies are omitted to avoid unnecessarily confusing the concepts of the present invention. Embodiment

[0029] As Figure 1 、 6 shown, an electric chain tightener includes an upper hook assembly 1, a lower hook assembly 2, a chain 3 and a tightener main body; the chain 3 is wound between the upper hook assembly 1 and the lower hook assembly 2 and passes through the tightener main body, and the tightener main body is arranged on the upper hook assembly 1; the tightener main body includes a transmission system, a driving mechanism for driving the chain 3, a switching mechanism for switching the electric chain tightener to the neutral gear, an electric control box and a housing 4; the housing 4 includes a second wallboard 4-2 and a first wallboard 4-1 fixed on both sides of the upper hook assembly 1, as well as a rear cover 4-4 arranged outside the first wallboard 4-1 and a front cover 4-3 arranged outside the second wallboard 4-2.

[0030] As shown Figure 2 , 3 , 4, and 5, the transmission system includes a motor 5 disposed outside 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 engaged with the first gear shaft 6, and a transmission mechanism engaged with the second gear shaft 7 and driving the drive mechanism to drive the endless chain 3; the second transmission gear shaft 7-1 penetrates through the front cover 4-3 on one side of the front cover 4-3, and the portion thereof penetrating through the front cover 4-3 constitutes a manual operation portion 7-6 for manually controlling the endless 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.

[0031] As shown Figure 3 , 4 , 5, and 8, the switching mechanism includes a fork limiting rod 8 disposed parallel to the second transmission gear shaft 7-1, a compression spring 9 and a fork 10 sleeved on the fork limiting rod 8, an adjusting handwheel 11 disposed at one end of the 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 rotatably disposed on the central axis of the first adjusting gear 12-1, a push rod 12-3 disposed in 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 panel 4-2 and the first wall panel 4-1, and the first adjusting gear 12-1 is disposed on the side close to the first wall panel 4-1; the fork limiting rod 8 passes through the front cover 4-3 and the first wall panel 4-1 and abuts against the end of the push rod 12-3 and is coaxially disposed with the push rod 12-3 in the sleeve 12-2. A groove is provided on the front cover 4-3, and the end of the fork limiting rod 8 extends out of the groove. The adjusting handwheel 11 is movably sleeved and limited on the portion of the fork limiting rod 8 extending out of the front cover 4-3. The adjusting handwheel 11 is disposed in the groove and is in threaded cooperation with the groove; the fork 10 is disposed on the fork limiting rod 8 in the first wall panel 4-1 and the front cover 4-3. A limiting seat 8-1 is provided on the fork limiting rod 8 on the side close to the first wall panel 4-1. The compression spring 9 is disposed between the adjusting handwheel 11 and the fork 10, and the fork 10 abuts against the limiting seat 8-1 through the compression spring 9.

[0032] As shown Figure 8 , 9As shown, the adjusting handwheel 11 includes an adjusting nut 11-1 and an adjusting screw rod 11-2. The adjusting screw rod 11-2 is in threaded fit with the groove, and the length of the adjusting screw rod 11-2 is greater than the depth of the groove. An annular step 8-2 is provided on the periphery of the end of the fork limiting rod 8 extending out of the front cover 4-3. From the step surface of the annular step 8-2 to the free end of the fork limiting rod 8 forms a limiting portion for limiting the adjusting handwheel 11 on the fork limiting rod 8. An annular limiting groove 8-3 is provided on this limiting portion, and a limiting retaining ring 8-4 is arranged in the annular limiting groove 8-3. The limiting retaining ring 8-4 is a C-shaped snap ring. The limiting retaining ring 8-4 is arranged on the outside of the adjusting nut 11-1, and the adjusting screw rod 11-2 is arranged on one side of the step surface of the annular step 8-2. The adjusting handwheel 11 is movably sleeved on the limiting portion 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 rod 11-2.

[0033] As Figure 5 , 7 , 8, 12 shown, the second gear shaft 7 further includes a second adjusting gear 7-4. The second adjusting gear 7-4 is arranged between the second wallboard 4-2 and the first wallboard 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 arranged in the first wallboard 4-1 and the front cover 4-3. The second driven gear 7-3 is matched with the transmission mechanism. The second driving gear 7-2 is sleeved on the second transmission tooth shaft 7-1. An external spline is provided on the side of the second transmission tooth shaft 7-1 close to the first wallboard 4-1. The second driving gear 7-2 is provided with an internal spline and is matched with the second transmission tooth shaft 7-1. An annular groove 7-5 coaxial with the second transmission tooth shaft 7-1 is provided on the side of the second driving gear 7-2 far from the first wallboard 4-1. The opening of the annular groove 7-5 is arranged along the radial direction of the second driving gear 7-2. The fork 10 includes a fork body 10-1 sleeved on the fork limiting rod 8 and a fork head 10-2 arranged along the radial direction of the fixed rod of the fork 10. The fork body 10-1 is limited on the limiting seat 8-1. The fork head 10-2 extends into the annular groove 7-5 and is slidably connected with the annular groove 7-5. As Figure 10 shown, ball bearings 10-3 sliding along the annular groove 7-5 are respectively arranged on both sides of the fork head 10-2, and a ball bearing 10-3 groove for limiting the ball bearings 10-3 is arranged on the fork head 10-2. The first transmission gear 6-2 is arranged on the side close to the first wallboard 4-1 and is matched with the second driving gear 7-2. As Figure 13 shown, a positioning pin 12-5 is arranged along the radial direction of the ejector rod 12-3, and an arc-shaped waist hole 12-6 through which the positioning pin 12-5 passes is arranged on the side wall of the sleeve 12-2. The arc-shaped waist hole 12-6 forms an angle with the radial plane of the sleeve 12-2.

[0034] As Figure 5 , 7As shown in Fig. 11, the transmission mechanism includes a third gear shaft 14, a fourth gear shaft 15 engaged with the third gear shaft 14, and a sprocket shaft 16 engaged 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 engaged with the second driven gear 7-3, and a third driven gear 14-3 engaged 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 engaged with the third driven gear 14-3, and a fourth driven gear 15-3 engaged with the sprocket shaft 16. The third transmission gear shaft 14-1 passes through the second wall panel 4-2 and the first wall panel 4-1. The third driving gear 14-2 is arranged outside the first wall panel 4-1 and meshes with the second driven gear 7-3. The third driven gear 14-3 is arranged outside the second wall panel 4-2 and meshes with the fourth driving gear 15-2. There are two sets of fourth gear shafts 15, which are respectively arranged on both sides of the third driven gear 14-3 and are both arranged outside the second wall panel 4-2. The sprocket shaft 16 is sleeved on the third transmission gear shaft 14-1. An axle gear 16-1 is arranged at the end of the sprocket shaft 16 extending outside the second wall panel 4-2, and the axle gear 16-1 meshes with the fourth driven gears 15-3 on both sides.

[0035] As Figure 7 shown, the driving mechanism is arranged below between the second wall panel 4-2 and the first wall panel 4-1. The driving mechanism includes a chain guide box 17 arranged below between the second wall panel 4-2 and the first wall panel 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 both the sprocket 18 and the sprocket shaft 16 are sleeved on the third transmission gear shaft 14-1. The endless chain 3 is wound around the sprocket 18, and its outer side is restricted by the chain guide box 17.

[0036] As Figure 8 、 12 shown, a micro switch 13 for switching the main power supply of the electric endless chain tightener is arranged on the front cover 4-3. The contact of the micro switch 13 is arranged close to one side of the fork body 10-1. A contact sliding surface matched with the contact is arranged along the axis of the fork limiting rod 8 on the side of the fork body 10-1 close to the contact. The contact sliding surface includes an inclined surface 10-4 close to the first wall panel 4-1 and a flat surface 10-5 connected with the inclined surface 10-4. When the contact slides on the inclined surface 10-4 or is not in contact with the contact sliding surface, the main power supply of the electric endless chain tightener is cut off. When the contact slides or stays on the flat surface 10-5, the main power supply of the electric endless chain tightener is powered on.

[0037] As Figure 7 、 8As shown in FIGS. 11 and 12, the first transmission gear shaft 6-1 is respectively defined on the first wallboard 4-1 and the front cover 4-3 through bearings; the second transmission gear shaft 7-1 is respectively defined on the first wallboard 4-1 and the front cover 4-3 through bearings; the sleeve 12-2 is defined between the second wallboard 4-2 and the first wallboard 4-1 through a bearing. A ratchet structure 19 for braking is also sleeved on the third transmission gear shaft 14-1, and the ratchet structure 19 is arranged on the outer side of the first wallboard 4-1.

[0038] When the electric chain tightener of this embodiment is used under normal electric control, as Figure 8 、 9 shown, the second driving gear 7-2 is engaged with the first transmission gear 6-2 by spline fitting with the second transmission gear shaft 7-1. The motor 5 drives the first transmission gear shaft 6-1 to rotate, 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, so as to drive the sprocket 18 to rotate, and thus the chain 3 is wound and unwound.

[0039] When the electric chain tightener needs to quickly wind up the chain 3, or the battery runs out of power, or the motor 5 has problems, the electric chain tightener needs to be set to the neutral state, and the winding and unwinding of the chain 3 are controlled manually. As Figure 12 shown, rotate the adjusting handwheel 11 counterclockwise, the adjusting handwheel 11 screws out towards the outside of the groove, drives the fork limiting rod 8 to move towards the outside of the front cover 4-3, the limiting seat 8-1 on the fork limiting rod 8 drives the fork 10 away from the first wallboard 4-1, the fork 10 drives the second driving gear 7-2 to move along the second transmission gear shaft 7-1, and separates 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 spline-connected and can slide axially freely, realizing the disconnection of the transmission chain; at this time, the microswitch 13 acts, and the contact of the microswitch 13 enters from the plane 10-5 on the fork 10 to the inclined surface 10-4 of the fork 10, cutting off the power supply to the motor 5. At this time, the operating handle cannot control the rotation of the motor 5 to prevent misoperation; the manual operation part 7-6 of the second transmission gear shaft 7-1 protruding from the front cover 4-3 is generally an external hexagonal structure, and can be matched with the manual operation part 7-6 through a socket wrench with an internal hexagon or a socket drill with an internal hexagon, so as to drive the second transmission gear shaft 7-1 to rotate, and thus control the sprocket 18 to quickly pull the chain 3 to a proper position.

[0040] When the electric chain tightener of this embodiment needs to be switched to the automatic drive of the motor 5 to wind and unwind the chain 3, in this state, turn the adjusting handwheel 11 clockwise. The adjusting nut 11-1 on the adjusting handwheel 11 is tightened against the groove on the front cover 4-3. The adjusting screw 11-2 presses the fork limiting rod 8 through the annular step 8-2 on the fork limiting rod 8 and moves the fork limiting rod 8 into the front cover 4-3. At the same time, the adjusting screw 11-2 presses the compression spring 9 and the fork 10 and moves them towards the first wallboard 4-1. As shown in state A in Figure 14 , the fork 10 drives the second driving gear 7-2 to move towards the first transmission gear 6-2. However, the meshing teeth of the first driving gear and the first transmission gear 6-2 are in random positions. There is a high probability that the teeth of the first driving gear and the first transmission gear 6-2 are not exactly in the facing meshing positions. As shown in Figure 12 , the teeth of the second driving gear 7-2 abut against the teeth of the first transmission gear 6-2. At this time, they cannot enter the meshing state; as shown in Figure 13 , while the fork limiting rod 8 is moving, it abuts against the ejector rod 12-3 of the adjusting mechanism 12 and compresses the return spring 12-4 in the sleeve 12-2. During the movement of the ejector rod 12-3, the positioning pin 12-5 on the ejector 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. Among them, the positioning pin 12-5 moves in a straight line. During the movement of the positioning pin 12-5, the positioning pin 12-5 and the arc-shaped waist hole 12-6 cooperate with each other to force the sleeve 12-2 to rotate. Since the sleeve 12-2 is fixedly arranged coaxially with the first adjusting gear 12-1, the first adjusting gear 12-1 drives the second adjusting gear 7-4 to rotate. The second adjusting gear 7-4 drives the second driving gear 7-2 to rotate. And the first driving gear is slidably connected to the fork 10, so it does not affect the rotation of the second driving gear 7-2. Therefore, when the second driving gear 7-2 moves towards and contacts the first driving gear, the second driving gear 7-2 is in a rotating state. At the same time, during the movement of the fork limiting rod 8, the contact of the microswitch 13 is on the inclined surface 10-4 of the fork 10, and the electric chain tightener is in a power-off state.

[0041] After the second driving gear 7-2 abuts against the first transmission gear 6-2, at this time, the positioning pin 12-5 in the sleeve 12-2 is at the middle of the arc-shaped waist hole 12-6 of the sleeve 12-2. Since the second driving gear 7-2 is controlled by the adjusting screw 11-2, the compression spring 9 and the fork 10, it does not affect the movement of the fork limiting rod 8. The adjusting handwheel 11 continues to rotate clockwise, driving the fork limiting rod 8 to continue to move. The fork limiting rod 8 drives the ejector rod 12-3 to continue to move. The positioning pin 12-5 on the ejector 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 to rotate, and at the same time drives the second driving gear 7-2 to continue to rotate; as shown in Figure 14As shown in state B in [description], when the second driving gear 7-2 and the first transmission gear 6-2 are in the meshing position corresponding to each other, the second driving gear 7-2 quickly meshes with the first gear under the action of the compression spring 9 and the 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 rotating the adjusting handwheel 11 can achieve the meshing of the second driving gear 7-2 and the first transmission gear 6-2. At this time, the contact of the microswitch 13 also slides from the inclined surface 10-4 of the fork 10 to the flat surface 10-5 of the fork 10. At this time, the electric ring chain tightener is in the energized state, and the motor 5 can be controlled to rotate by the handle or the infinite controller.

[0042] After the motor 5 is powered on and controlled, as Figure 8 shown, the 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 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, and then drives the fourth transmission gear shaft 15-1 to rotate. The fourth driven gear 15-3 meshes with the shaft gear 16-1, and finally drives the sprocket shaft 16 to rotate. The sprocket shaft 16 is fixedly connected to the sprocket 18, and the rotation of the sprocket 18 drives the movement of the chain 3.

[0043] In the description of the present invention, it should be understood that if terms such as "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are used to indicate the orientation or position relationship, it is based on the orientation or position relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation of the present invention. In addition, if terms such as "first", "second", etc. are used, they are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0044] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, if the terms "installed", "connected", "coupled" are used, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific circumstances.

Claims

1. An electric chain tightener, comprising an upper hook assembly (1), a lower hook assembly (2), a chain (3) and a tightener body; the chain (3) is wound between the upper hook assembly (1) and the lower hook assembly (2) and passes through the tightener body, and the tightener body is arranged on the upper hook assembly (1); characterized in that, The main body of the wire tightener includes a transmission system, a driving mechanism for driving the driving chain (3), a switching mechanism for switching the electric chain wire tightener to the neutral gear position, an electric 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) arranged outside the first wall panel (4-1) and a rear cover (4-4) arranged outside the second wall panel (4-2). The driving mechanism is arranged below between the second wall panel (4-2) and the first wall panel (4-1). The transmission system includes a motor (5) arranged outside 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) engaged with the first gear shaft (6), and a transmission mechanism engaged with the second gear shaft (7) and driving the driving mechanism to drive the chain (3); the first gear shaft (6) includes a first transmission tooth shaft (6-1) and a first transmission gear (6-2), and the second gear shaft (7) includes a second transmission tooth shaft (7-1) parallel to the first transmission tooth shaft (6-1), a second driving gear (7-2), and a second driven gear (7-3). The switching mechanism includes a fork limiting rod (8) arranged parallel to the second transmission tooth shaft (7-1), a compression spring (9) and a fork (10) sleeved on the fork limiting rod (8), an adjusting handwheel (11) arranged at one end of the fork limiting rod (8), and an adjusting mechanism (12) arranged at the other end; the adjusting mechanism (12) includes a first adjusting gear (12-1), a sleeve (12-2) rotatably arranged on the central axis of the first adjusting gear (12-1), a push rod (12-3) arranged in the sleeve (12-2), and a return spring (12-4) arranged below the push rod (12-3); the adjusting mechanism (12) is arranged between the second wall panel (4-2) and the first wall panel (4-1), and the first adjusting gear (12-1) is arranged on the side close to the first wall panel (4-1); the fork limiting rod (8) passes through the front cover (4-3) and the first wall panel (4-1) and abuts against the end of the push rod (12-3) and is coaxially arranged with the push rod (12-3) in the sleeve (12-2), a groove is arranged on the front cover (4-3), and the end of the fork limiting rod (8) extends out of the groove, the adjusting handwheel (11) is movably sleeved and limited on the part of the fork limiting rod (8) extending out of the front cover (4-3), the adjusting handwheel (11) is arranged in the groove and is in threaded cooperation with the groove; the fork (10) is arranged on the fork limiting rod (8) in the first wall panel (4-1) and the front cover (4-3), a limiting seat (8-1) is arranged on the fork limiting rod (8) on the side close to the first wall panel (4-1), the compression spring (9) is arranged between the adjusting handwheel (11) and the fork (10), and the 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). The second adjusting gear (7-4) is arranged between the second wallboard (4-2) and the first wallboard (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 arranged in the first wallboard (4-1) and the front cover (4-3). The second driven gear (7-3) cooperates with a transmission mechanism. The second driving gear (7-2) is sleeved on the second transmission tooth shaft (7-1). An external spline is arranged on one side of the second transmission tooth shaft (7-1) close to the first wallboard (4-1). The second driving gear (7-2) is provided with an internal spline and cooperates with the second transmission tooth shaft (7-1). An annular groove (7-5) coaxial with the second transmission tooth shaft (7-1) is arranged on one side of the second driving gear (7-2) away from the first wallboard (4-1). The opening of the annular groove (7-5) is arranged radially along the second driving gear (7-2). The fork (10) includes a fork body (10-1) sleeved on the fork limiting rod (8) and a fork head (10-2) arranged radially along the fixed rod of the fork (10). The fork body (10-1) is limited on the limiting seat (8-1). The fork head (10-2) extends into the annular groove (7-5) and is slidably connected with the annular groove (7-5). The first transmission gear (6-2) is arranged on one side close to the first wallboard (4-1) and cooperates with the second driving gear (7-2). A positioning pin (12-5) is arranged radially along the ejector rod (12-3). An arc-shaped waist hole (12-6) through which the positioning pin (12-5) passes is arranged on the side wall of the sleeve (12-2). The arc-shaped waist hole (12-6) forms an angle with the radial plane of the sleeve (12-2). By rotating the adjusting handwheel (11) to drive the fork limiting rod (8) to move, the fork limiting rod (8) abuts against the ejector rod (12-3) to move axially along the sleeve (12-2) in the sleeve (12-2), so as to force the first adjusting gear (12-1) to rotate through the positioning pin (12-5). Under the action of the compression spring (9) compressed by the adjusting handwheel (11), the second driving gear (7-2) presses down to make the second driving gear (7-2) semi-engage with the second transmission tooth shaft (7-1) through splines. At the same time, the second adjusting gear (7-4) rotates to adjust the second driving gear (7-2) and the first transmission gear (6-2) to be aligned with each other to the meshing position and then engage. By adjusting the adjusting handwheel (11) to move the fork limiting rod (8) out of the front cover (4-3), the fork (10) drives the second driving gear (7-2) to be separated from the first transmission gear (6-2).

2. The electric chain tightener according to claim 1, wherein, Ball bearings (10-3) sliding along the annular groove (7-5) are respectively arranged on both sides of the fork head (10-2). A ball bearing (10-3) groove for limiting the ball bearings (10-3) is arranged on the fork head (10-2).

3. The electric chain tightener according to claim 1, characterized in that The adjusting handwheel (11) includes an adjusting nut (11-1) and an adjusting screw rod (11-2), and the adjusting screw rod (11-2) is in threaded fit with the groove; an annular step (8-2) is provided on the outer periphery of the end of the fork limiting rod (8) protruding from the front cover (4-3). The limiting part of the adjusting handwheel (11) on the fork limiting rod (8) is formed from the step surface of the annular step (8-2) to the free end of the fork limiting rod (8). An annular limiting groove (8-3) is provided on the limiting part, and a limiting retaining ring (8-4) is arranged in the annular limiting groove (8-3). The limiting retaining ring (8-4) is arranged outside the adjusting nut (11-1), and the adjusting screw rod (11-2) is arranged 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 rod (11-2).

4. The electric chain tightener according to claim 3, characterized in that, The length of the adjusting screw rod (11-2) is greater than the depth of the groove.

5. The electric chain tightener according to claim 1, characterized in that, The first transmission gear shaft (6-1) is respectively limited on the first wallboard (4-1) and the front cover (4-3) through bearings; the second transmission gear shaft (7-1) is respectively limited on the first wallboard (4-1) and the front cover (4-3) through bearings; the sleeve (12-2) is limited between the second wallboard (4-2) and the first wallboard (4-1) through a bearing.

6. The electric chain tightener according to claim 1, wherein, A microswitch (13) for switching the main power supply of the electric chain tightener is provided on the front cover (4-3). The contact of the microswitch (13) is arranged on the side close to the fork body (10-1). A contact sliding surface for cooperating with the contact is arranged on the fork body (10-1) along the axis of the fork limiting rod (8) on the side close to the contact. The contact sliding surface includes an inclined surface (10-4) close to the first wallboard (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 is not in contact with the contact sliding surface, the main power supply of the electric chain tightener is powered off; when the contact slides or stays on the plane (10-5), the main power supply of the electric chain tightener is powered on.

7. An electric chain tightener according to claim 1, characterized in that, The second transmission gear shaft (7-1) penetrates through the front cover (4-3) on one side of the front cover (4-3), and the part penetrating through the front cover (4-3) constitutes the manual operation part (7-6) of the manual control loop chain (3).

8. An electric chain tightener according to claim 1, characterized in that, The transmission mechanism includes a third gear shaft (14), a fourth gear shaft (15) engaged with the third gear shaft (14), and a sprocket shaft (16) engaged 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) engaged with the second driven gear (7-3), and a third driven gear (14-3) engaged 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) engaged with the third driven gear (14-3), and a fourth driven gear (15-3) engaged with the sprocket shaft (16); the third transmission gear shaft (14-1) passes through the second wall panel (4-2) and the first wall panel (4-1), the third driving gear (14-2) is arranged outside the first wall panel (4-1) and meshes with the second driven gear (7-3), and the third driven gear (14-3) is arranged outside the second wall panel (4-2) and meshes with the fourth driving gear (15-2); there are two sets of the fourth gear shafts (15), which are respectively arranged on both sides of the third driven gear (14-3) and are both arranged outside the second wall panel (4-2); the sprocket shaft (16) is sleeved on the third transmission gear shaft (14-1), and a shaft gear (16-1) is arranged at the end of the sprocket shaft (16) extending outside the second wall panel (4-2), and the shaft gear (16-1) meshes with the fourth driven gears (15-3) on both sides.

9. The electric chain tightener according to claim 8, wherein, The driving mechanism includes a chain guide box (17) arranged below between the second wall panel (4-2) and the first wall panel (4-1), and a sprocket (18) arranged in 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 endless chain (3) is wound around the sprocket (18), and its outer side is restricted by the chain guide box (17).

10. The electric chain tightener according to claim 8, characterized in that, A ratchet structure (19) for braking is also sleeved on the third transmission gear shaft (14-1), and the ratchet structure (19) is arranged outside the first wall panel (4-1).

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