Chain mast with screw drive

Abstract

The invention discloses a chain mast adopting a spiral transmission. The chain mast adopts a DC reduction motor through a worm, a worm wheel with a vertical rotation axis and a spiral groove, to push a pair of left and right chain links with a boss on the outside and a cylindrical shape that are meshed back to back to rise or fall, thereby realizing the task of erecting or withdrawing the mast. The structural type of the first and second chain links is similar to a part formed by a section of a cylinder with an external rectangular thread being split into left and right parts, and the internal structure thereof is adaptively adjusted, and the external thread feature of a chain link retains a convex cylinder. A threading waist-shaped through hole is arranged in the middle of the left and right chain links to meet the signal transmission requirements of the top and bottom of the mast, and no redundant wire-retracting and releasing mechanism is added. The meshing of the left and right chain links with their corresponding front and rear chain links and the meshing between them are all provided with a profile, so that the rigidity of the left and right chains after meshing is the same as that of the entire rigid cylinder, and the load-bearing capacity is greatly improved, and it is no longer necessary to carry and guide the additional sleeve required for the meshing of a single rigid chain, thereby avoiding the overlap requirement of the connection between the sleeves, so that the telescopic ratio of the chain mast is greatly improved, and the application range is wider.

Description

Technical Field

[0001] The invention relates to the technical field of chain masts, in particular to a chain mast adopting spiral transmission. Background Art

[0002] A chain with rigidity on one side is a special chain. One side of the chain is flexible like an ordinary chain, and the other side is rigid. Therefore, the actuator composed of a chain with rigidity on one side and a driver can replace hydraulic cylinders, pneumatic cylinders, electric push rods, etc., which are widely used in places where large stroke lifting loads are required to achieve rapid erection and withdrawal of equipment. Although it is used in many fields, it also has the following disadvantages:

[0003] Chain masts are usually driven by a drive device through a shaft to drive a sprocket or gear to move the chain links to achieve the rise or fall of the chain links. There are many transmission links. In addition, the space of the driving part is usually limited, so the load-bearing capacity of the sprocket or gear is limited, resulting in a smaller overall load-bearing capacity of the mast;

[0004] The single-sided chain type has rigidity in one direction, and usually uses sleeves to achieve loads in any direction. Since there needs to be a certain degree of overlap between the sleeves to withstand bending moment or torque, the mast's telescopic ability is relatively small, and the height is relatively high after retraction.

[0005] When active equipment is used at the top of the mast, an additional cable drive device is usually required to achieve the cable retraction and payout requirements. Summary of the invention

[0006] The object of the present invention is to provide a chain mast adopting screw transmission.

[0007] The technical solution for realizing the present invention is: a chain mast adopting a spiral transmission, comprising a housing, a worm wheel, a worm, a DC reduction motor, a motor gear, an upper tapered roller bearing, a guide flange, a flange plate, a first chain link, a second chain link, a control board group, a lower tapered roller bearing, a worm gear and an encoder;

[0008] The lower tapered roller bearing, the worm gear, the upper tapered roller bearing and the guide flange are coaxially arranged in sequence in the vertical axis direction inside the housing. The worm gear is connected to the housing in rotation in the vertical axis direction through the lower tapered roller bearing and the upper tapered roller bearing. A first chain consisting of a plurality of first chain links starts from one side of the housing, and a second chain consisting of a plurality of second chain links starts from the other side of the housing, and passes through the worm gear and the guide flange in sequence, and a flange is arranged on the top of the chain. A DC reduction motor and a worm are arranged in an upper cavity on one side of the housing. The shaft ends of the DC reduction motor and the worm are respectively provided with motor gears and worm gears, and the motor gears and the worm gears are meshed for transmission. An encoder is arranged at the other shaft end of the worm, and the worm and the worm wheel are meshed for transmission. A control board group is arranged in the upper cavity on the other side of the housing to receive the position signal fed back by the encoder and control the DC reduction motor. The DC reduction motor and the worm realize power and motion transmission through the meshing transmission of the motor gear and the worm gear, and the meshing transmission of the worm and the worm wheel transmits the rotation of the worm to the worm wheel.

[0009] The first chain link and the second chain link mesh to form a cylinder with a boss, and the boss is staggered and arranged on the outside of the cylinder; the subsequent first chain link and the second chain link together form the next cylinder, and the upper and lower cylinder segments are meshed through the profile to form a longer cylinder, until the first chain link and the second chain link and their adjacent chain links are meshed to achieve the load-bearing and erection requirements of the mast;

[0010] The worm wheel has a spiral groove built in, and the axis is vertical, coaxial with the cylinder with a boss formed by meshing with the first chain link and the second chain link; the output shaft of the DC reduction motor is parallel to the axis of the worm, and the motion and torque are transmitted through the motor gear on the motor output shaft meshing with the worm gear installed on the worm shaft end;

[0011] When the worm wheel rotates around the longitudinal axis, the cylinder formed by the meshing of the first link and the second link is pushed to move along its axis.

[0012] The first and second profiles meshing with the front and rear first links are respectively arranged on the upper and lower sides of the first link, the third profile meshing with the second link is arranged on the right side of the first link, two chain guide grooves are arranged on the profiles, the front and rear faces of the first link are part of the outer cylindrical surface, the first hinge hole and the second hinge hole connected with the front and rear first links are arranged on the upper and lower parts of the left side of the first link, a convex cylinder with a horizontal axis is arranged on the left side of the first link beyond the outer cylindrical surface, and two waist-shaped threading holes are arranged in the middle of the first link; the first link is hinged to the previous first link through a short link shaft inserted into the first hinge hole, and the first link is hinged to the next first link through a short link shaft inserted into the second hinge hole, so as to sequentially form the first chain.

[0013] The first and second profiles meshing with the front and rear second links are respectively arranged on the upper and lower sides of the second link, a third profile meshing with the first link is arranged on the left side of the second link, two chain guide grooves are arranged on the profiles, the front and rear faces of the second link are part of the outer cylindrical surface, the first hinge hole and the second hinge hole connected with the front and rear first links are arranged on the upper and lower parts of the left side of the second link, a convex cylinder with a horizontal axis is arranged on the right side of the second link beyond the outer cylindrical surface, and two waist-shaped threading holes are arranged in the middle of the second link; the second link is hinged to the previous second link through a short link shaft inserted into the first hinge hole, and the second link is hinged to the next second link through a short link shaft inserted into the second hinge hole, so as to sequentially form a second chain.

[0014] The waist-shaped threading holes of the first link and the second link are located at the four corners of the meshing cylinder formed by the first link and the second link. Cables are arranged in the waist-shaped holes of the first link and the second link for signal transmission between the top and the bottom of the chain mast.

[0015] The guide plate is in the shape of a human and is located in the internal cavity at the lower part of the shell; the guide flange, the guide plate and the internal spiral groove of the worm wheel jointly complete the guiding function of the engagement and disengagement of the first chain link and the second chain link.

[0016] The control board group controls the on and off of the DC reduction motor according to the rotation angle of the worm fed back by the encoder, thereby realizing closed-loop control of the chain mast stroke.

[0017] When the mast needs to be erected, the control board group determines whether it is erected in place according to the worm angle feedback from the encoder. If not, the DC reduction motor is driven through the worm to drive the meshing worm wheel to rotate around the vertical axis. The spiral groove of the worm wheel causes the meshing first chain link and the second chain link to rise together. Through the combined action of the guide plate and the spiral groove built into the worm wheel, the first chain and the second chain enter into meshing. When it is erected in place, that is, when the angle signal fed back by the encoder to the control board group reaches the target value, the control board group stops driving the DC reduction motor, and the mast is erected. When the mast needs to be retracted, the control board group determines whether it is retracted in place based on the worm angle feedback from the encoder. If not, the DC reduction motor is driven through the worm to drive the worm wheel meshing with it to rotate in the opposite direction around the vertical axis. The spiral groove of the worm wheel causes the meshing first chain link and the second chain link to drop together. Through the combined action of the guide plate and the spiral groove built into the worm wheel, the first chain and the second chain are disengaged. When the mast is retracted in place, that is, when the angle signal fed back by the encoder to the control board group reaches the target value, the control board group stops driving the DC reduction motor and the mast is retracted.

[0018] The withdrawal guide device of the first chain is located on one side of the shell, and is composed of a base plate, a guide plate, a long optical axis, a U-shaped guide plate, a short optical axis, and an upper cover plate; the base plate is fixed to the bottom of the shell by screws, and provides a mounting surface, on which the U-shaped guide plate, the long optical axis, and the guide plate are arranged in sequence; an upper cover plate is arranged on one side of the shell, and a short optical axis is arranged below the upper cover plate, and one end of the short optical axis is connected to the guiding end of the U-shaped guide plate; the half part of one side of the guide plate, the long optical axis, the U-shaped guide plate and the short optical axis form a "U"-shaped first chain withdrawal guide channel rotated 90° clockwise on one side of the shell.

[0019] The withdrawal guide device of the second chain composed of the second chain links is located on the other side of the shell, and is composed of a base plate, a guide plate, a long optical axis, a U-shaped guide plate, a short optical axis, and an upper cover plate; the base plate provides a mounting surface, on which the U-shaped guide plate, the long optical axis, and the guide plate are arranged in sequence; an upper cover plate is arranged on the other side of the shell, and a short optical axis is arranged below the upper cover plate, and one end of the short optical axis is connected to the guiding end of the U-shaped guide plate; the half part on the other side of the guide plate, the long optical axis, the U-shaped guide plate and the short optical axis form a "U"-shaped second chain withdrawal guide channel rotated 90° counterclockwise on the other side of the shell.

[0020] Compared with the prior art, the present invention has the following significant advantages: (1) The spiral groove built into the worm wheel is used to drive the left and right chain links to rise or fall, and the rotational motion of the worm wheel is directly transmitted to the left and right chains that are cylindrical after meshing through the spiral groove. It is no longer necessary to mesh sprockets or gears to achieve transmission, the transmission chain is shortened, and the stiffness of the left and right chains after meshing is the same as the stiffness performance of the entire rigid cylinder. Therefore, the overall load-bearing performance is greatly improved; (2) When a single chain is lifted or lowered, an auxiliary sleeve is required to carry the load, and the connection between the sleeves requires a certain degree of overlap to achieve the guidance and load-bearing requirements. The left and right chain links mesh with each other to form a cylinder, which can withstand loads in any direction. No auxiliary guide sleeve is required, and a larger telescopic ratio is achieved; (3) Waist-shaped threading holes are set inside the left and right chain links, and signal transmission channels at the top and bottom of the mast can be set as needed, without adding redundant winding or releasing mechanisms; (4) The worm and worm gear mechanism has the characteristic of self-locking. Even if the power is suddenly cut off, it cannot be driven in the reverse direction. Therefore, the chain mast does not need to be equipped with any braking device, and the erection requirements of any height within the stroke can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a main sectional view of the chain mast of the present invention in a retracted state.

[0022] Figure 2 It is a cross-sectional view of the guide device of the chain mast erection state of the present invention.

[0023] Figure 3 It is a cross-sectional view of the main transmission system of the chain mast of the present invention.

[0024] Figure 4It is a sectional view of the chain box guide of the present invention.

[0025] Figure 5 It is a diagram of the engagement of the first link and the second link of the present invention.

[0026] Figure 6 It is a three-dimensional diagram of the first chain link of the present invention.

[0027] Figure 7 It is a three-dimensional diagram of the second chain link of the present invention.

[0028] Figure 8 It is a cross-sectional view of the worm gear of the present invention.

[0029] Fig. 9 It is a cross-sectional view of the shell of the present invention.

[0030] Fig.10 It is a three-dimensional diagram of the chain mast of the present invention being withdrawn and retracted.

[0031] Fig.11 It is a three-dimensional diagram of the chain mast erection of the present invention. DETAILED DESCRIPTION

[0032] The present invention provides a chain mast adopting a spiral transmission. A DC reduction motor drives a worm through a pair of meshing gears, thereby driving a worm wheel with a vertical axis to rotate, and a spiral groove is arranged in the inner hole of the worm wheel, and a convex cylinder is staggered on the cylindrical surface formed by the meshing of the left and right chain links, so that the rotation of the worm wheel around the vertical axis causes the left and right chain links that are cylindrical after meshing to rise or fall, thereby realizing the task of erecting or withdrawing the chain mast.

[0033] The technical route of the present invention: The present invention adopts a chain mast with spiral transmission, which is mainly composed of a shell, a DC reduction motor, a motor gear, a worm gear, a worm, a worm wheel, an encoder, a left chain link (i.e., the first chain link), a right chain link (i.e., the second chain link), a guide flange, a flange, a chain link guide device, a control panel group, and a cable. Among them, the inner hole of the worm wheel has a spiral groove, and its axis is vertical; the structural type of the left and right chain links is similar to a section of a cylinder with an external rectangular thread, which is divided left and right through the axis, and its structure is adaptively adjusted, and its external rectangular thread is adaptively cut, and a number of bosses are maintained at appropriate positions; the upper and lower sides of the left chain link have a profile that meshes with the front and rear chain links, and the right side of the left chain link has a profile that meshes with the right chain link, and two chain guide grooves are arranged on the profile, the front and rear sides of the left chain link are part of the outer cylindrical surface, and the upper and lower sides of the left chain link are The left chain link has a hinge hole connected to the front and rear left chain links, the left side of the left chain link exceeds the outer cylindrical surface by a first convex cylinder 201 with an axis horizontal, and two waist-shaped threading holes are arranged in the middle of the left chain link; the upper and lower sides of the right chain link have profiles meshing with the front and rear right chain links, the left side of the right chain link has a profile meshing with the left chain link, and two chain guide grooves are arranged on the profiles, the front and rear of the right chain link are part of the outer cylindrical surface, the upper and lower parts of the right side of the right chain link have hinge holes connected to the front and rear right chain links, and the right side of the right chain link exceeds the outer cylindrical surface by a section of the axis horizontal The second convex cylinder 202 has two waist-shaped threading holes in the middle of the right chain link; the left and right chain links are meshed to form an outer cylinder with convex cylinders arranged in a staggered manner on the outside in the height direction; when the left and right chain links are meshed to form a section of cylinder with a boss, it is coaxial with the inner hole of the worm wheel; the output shaft of the DC reduction motor is parallel to the axis of the worm, and the motor gear on the motor output shaft is meshed with the worm gear installed on the end of the worm shaft to transmit motion and torque; the encoder is installed on the other end of the worm shaft; the worm is meshed with the worm wheel with the vertical axis, and the motion and Torque can only be transmitted to the worm wheel by the worm, and cannot be transmitted in the opposite direction. The left and right chain links that have been meshed are installed on the lower side of the flange at the top of the mast. The left and right chain links are followed by left and right chains composed of corresponding left and right chain links, and the chain length is determined by the mast stroke. In addition, the left and right chains are arranged with cables in the waist-shaped threading holes of the left and right chain links as needed. The guide flange and the left and right chain link guide devices jointly complete the guiding function of the engagement and disengagement of the left and right chain links. The control board group realizes closed-loop control of the stroke of the chain mast according to the worm angle fed back by the encoder.

[0034] Furthermore, when the worm wheel rotates around the longitudinal axis, it pushes the left and right chain links that are in the form of a cylinder with a boss and coaxial with the worm wheel to move up and down, thereby realizing the raising or lowering of the chain mast. The worm wheel directly pushes the left and right chain links that are in the form of a cylinder with a boss after meshing through the inner spiral groove to rise or fall, and no additional sprockets or gears are needed in the middle to move the links of the chain links, shortening the transmission chain, not only improving efficiency, but also the carrying capacity is no longer determined by the sprockets or gears whose size is limited by space, but depends on the shear strength of the outer bosses of the left and right chain links, and the carrying capacity is greatly improved.

[0035] Furthermore, when the chain mast needs to be erected, the control board group determines whether the worm angle fed back by the encoder is in place. If not, it drives the DC reduction motor to transmit the motion and torque to the worm through the motor gear and the worm gear, driving the worm wheel meshing with it to rotate around the vertical axis, and through the spiral groove of the worm wheel, the left and right chain links that are cylindrical with external bosses after meshing rise together, and the guide device guides the left and right chains to mesh in turn. When the mast is erected in place, that is, the encoder feeds back a signal of in-place to the control board group, the control board group stops driving the DC reduction motor, and the mast is erected; when the chain mast needs to be withdrawn, the control board group determines whether the worm angle fed back by the encoder is in place. If not, it drives the DC reduction motor The high-speed motor transmits the reverse rotation motion and torque to the worm through the motor gear and the worm gear, driving the meshing worm wheel to rotate in the opposite direction around the vertical axis, and the spiral groove of the worm wheel causes the meshing left and right chain links to drop together. The guide device guides the left and right chains to disengage and enter the corresponding chain boxes respectively. When the mast is withdrawn into place, the encoder feeds back the in-place signal to the control board group, the control board group stops driving the motor, and the mast is withdrawn. When the chain mast is erected or withdrawn, there is a sudden external interruption, and the control board group stops driving the motor. Since the chain and the load cannot rely on their own weight to reversely drive the worm wheel to drive the worm, the safety requirements of the chain mast can be met, and the erection requirements of any height can be achieved.

[0036] Furthermore, a single chain has unidirectional stiffness, that is, one side of the chain has ballast stiffness when the chain rises. The left chain composed of left links has ballast stiffness on the right side, and the right chain composed of right links has ballast stiffness on the left side. After the left and right chains are meshed to form a cylinder, the whole has ballast stiffness, and the profiles are set at the upper and lower positions of the left and right links to mesh with the corresponding front and rear links, which can achieve loads in various directions such as anti-overturning and torsion, and achieve performance similar to that of a whole rigid cylinder. Since the left and right chains are meshed to form a whole rigid cylinder, they can withstand loads in various directions. In order to solve the problem that the single chain only has unidirectional ballast stiffness, the additional sleeve is no longer required to guide and bear the eccentric load. By omitting the sleeve, the overlap requirement required for the connection between the sleeves can be avoided. It is only necessary to install a protective cover on the outside of the left and right chains after meshing, so that the total height of the chain mast can be relatively low when it is retracted, and a large telescopic ratio can be achieved.

[0037] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0038] Chain mast with screw drive Figure 1 , 2As shown in Figures 3, 4 and 5, it is mainly composed of the following parts: housing 1, base plate 2, worm wheel 3, worm 4, DC reduction motor 5, long optical axis 6, U-shaped guide plate 7, end cover plate 8, short chain link shaft 9, upper cover plate 10, short optical axis 11, chain link seat 12, cover plate 13, motor gear 14, motor worm seat 15, upper tapered roller bearing 16, guide flange 17, flange 18, left chain link 19, cable 20, right chain link 21, long chain link shaft 22, protective sleeve 23, clamp 24, control board group 25, electrical connector 26, cover 27, lower tapered roller shaft 28, connecting column 29, guide plate 30, worm gear 31, connecting rod 32, tapered roller bearing 33, encoder 34, pressure ring 35, screw 36, retaining ring 37, etc.

[0039] The structural features of the left link 19 (i.e., the first link 19) are as follows: Figure 6 As shown, the structural features of the right link 21 (i.e., the second link) are as follows Figure 7 As shown, the left link 19 mainly consists of the following features: a first convex cylinder 201, a guide boss 213, a lower hinge hole 211 and its axial positioning surface 212, an upper hinge shaft 203 and its axial positioning surface 204, two waist-shaped through holes 205, an upper profile 206, a withdrawal guide groove 207, a right profile 208, an outer cylindrical surface 209, and a lower profile 210. Among them, the first convex cylinder 201 is located outside the outer cylindrical surface 209, and the axis of the first convex cylinder 201 is perpendicular to the axis of the outer cylindrical surface 209 and perpendicular to the axes of the hinge holes 203 and 211; the axis of the waist-shaped through hole 205 is parallel to the axis of the outer cylindrical surface 209; the axes of the two withdrawal guide grooves 207 are parallel to the axis of the outer cylindrical surface 209, and are symmetrically located on the front and rear sides of the dividing surface in the guide boss. The main structural features of the right link 21 are basically the same as those of the left link 19 except that the first convex cylinder 201 is arranged in a staggered manner, and will not be described in detail here.

[0040] The meshing state of the left chain link 19 and the right chain link 21 and the adjacent chain links is as follows: Figure 5 For the sake of clarity and completeness, Figure 5In the rear isometric view, the left and right positions of the left link 19 and the right link 21 are swapped, and the previous link in the adjacent link is added with A, and the next link is added with B. The left links 19A and 19B are hinged by the short link shaft 9 and limited by the shaft retaining ring 37. Since the left link 19 has a positioning groove 212, the shaft end of the short link shaft 9 and the shaft retaining ring 37 do not affect the guiding function of the guide boss 213 when withdrawing. The lower profile 210 of the left link 19A and the upper profile 206 of the left link 19B form a profile meshing 102, through which the rigidity requirement of the right side of the left link 19 is achieved, and the mutual hinge on the left side realizes the rotation of 19B around 19A within a suitable range. The meshing of the right links 21A and 21B and the left links 19A and 19B is similar and will not be described in detail, but the rigid side formed by the meshing of the right links 21A and 21B is on the left side. The right profile of the left link 19A meshes with the left profile of the right link 21A 103, and the right profile of the left link 19B meshes with the left profile of the right link 21B 104, so that the left and right links will not be misaligned when rising or falling. The outer cylindrical surface 209A of the left link 19A and the outer cylindrical surface 219A of the right link 21A together form a section of cylinder, and the convex cylinders 201A and 202A are misaligned and arranged on the outside of the cylinder formed by the meshing of the left and right links, that is, a part of the external thread of the cylinder formed by the left and right links. As the rigid side of the left link is on the right and the rigid side of the right link is on the left, it can be seen that this section of cylinder can withstand axial and radial loads and torque. The outer cylindrical surface 209B of the left link 19B and the outer cylindrical surface 219B of the right link 21B together form the next section of the cylinder, and the upper and lower cylindrical sections form a longer cylinder through the profile meshing 101, 102, so that the left and right links and their adjacent links can realize the mast load-bearing and erection requirements through meshing, and the left and right links and their adjacent links can realize the mast withdrawal requirements through disengagement. The waist-shaped threading through holes 205 of the left and right links are located at the four corners of the formed meshing cylinder, and the cables 20 are arranged as needed to realize the requirements of built-in cables.

[0041] The structural features of the worm gear 3 are as follows: Figure 8 As shown, it is mainly composed of a meshing surface 221 with a worm wheel, an inner hole spiral groove 222, an upper positioning outer cylindrical surface 223, an upper positioning step 224, an inner cylindrical surface 225, a lower positioning step 226 and a lower positioning outer cylindrical surface 227. Figure 3 As shown, when the worm wheel 3 rotates clockwise around its axis, the inner circular hole surface 225 limits the radial movement of the outer cylindrical surface formed by the meshing of the left and right chain links, and the spiral groove pushes the convex cylinders 202A, 201B, 202B, and 201B arranged in a staggered manner on the outside of the outer cylindrical surface in turn, thereby realizing the rise of this section of the cylinder; when the worm wheel 3 rotates counterclockwise around its axis, the spiral groove pushes the convex cylinders 201B, 202B, 201B, and 202A arranged in a staggered manner on the outside of the outer cylindrical surface in turn, thereby realizing the descent of this section of the cylinder.

[0042] The structural features of the housing 1 are as follows: Fig. 9 As shown, it mainly consists of the axial positioning surface 231 of the lower tapered roller bearing 28, the radial positioning hole 232 of the outer circle of the outer ring of the tapered roller bearings 16 and 28, the chain guide profile 233, the mounting surface 234 of the motor worm seat 15, the axial positioning surface 235 of the guide flange 17, the radial positioning surface 236, the cover plate mounting surface 237, the mounting surface 238 of the chain seat 12, the mounting surface 239 of the bottom plate 2, etc. Among them, the mounting surface 234 of the motor worm seat 15 is opened with the radial positioning hole 232 to meet the space requirements for the meshing of the worm 4 and the worm wheel 3.

[0043] The main transmission system of the chain mast with screw drive is as follows Figure 1 and 3As shown, it is mainly composed of the following parts: DC reduction motor 5, motor gear 14, worm gear 31, worm 4, encoder 34, worm wheel 3, left chain link 19, and right chain link 21. Among them, the axis of the DC reduction motor 5 is parallel to the axis of the worm 4, and the distance between the two axes is the meshing center distance of the motor gear 14 and the worm gear 31. The center distance of the two axes is required to be guaranteed by the processing accuracy of the motor worm seat 15. The motor 5 and the worm 4 are both installed on the motor worm seat 15. The motor 5 is installed on the worm seat through shaft hole matching and end face positioning. The worm 4 is supported and positioned by a pair of tapered roller bearings 33 installed face to face on the motor worm seat 15. The tapered roller bearing 33 is positioned and fixed through the positioning hole and positioning surface and threaded surface on the motor worm seat, the positioning journal and step on the worm 4, and the pressure ring 35, and is prevented from loosening by the set screw; the motor gear 14 is located at the output shaft end of the motor 5, and the worm gear 31 is located at the shaft end of the worm 4. The encoder 34 is installed coaxially with the worm 4, located at the other end of the worm 4, and connected to the worm 4 by screws 36. The bracket of the encoder 34 is connected to the pressure ring 35 by screws. The worm wheel 3 is fixed to the housing 1 through the lower tapered roller bearing 28 and the upper tapered roller bearing 16 installed face to face. The axis of the worm wheel 3 is vertical and perpendicular to the axis of the worm 4. The meshing center distance and axis perpendicularity of the worm wheel 3 and the worm wheel 4 are achieved by the assembly of the housing 1 and the motor worm seat 15. The housing 1, the lower tapered roller bearing 28, the worm wheel 3, the upper tapered roller bearing 16, and the guide flange 17 are installed coaxially. The inner hole of the inner ring of the lower tapered roller bearing 28 cooperates with the axial hole of the outer cylindrical surface 227 of the worm wheel 3, the outer circle of the outer ring cooperates with the positioning hole 232 of the housing 1, the lower end face of the outer ring of the bearing 28 fits with the positioning surface 231 of the housing 1, and the upper end face of the inner ring fits with the positioning step 226 of the worm wheel 3; the inner hole of the inner ring of the upper tapered roller bearing 16 cooperates with the axial hole of the outer cylindrical surface 223 of the worm wheel 3, the outer circle of the outer ring cooperates with the positioning hole 232 of the housing 1, the upper end face of the outer ring of the bearing 16 is limited by the guide flange 17, and the lower end face of the inner ring fits with the positioning step 224 of the worm wheel 3; the worm wheel 3 relies on the housing 1, the lower tapered roller bearing 28, the upper tapered roller bearing 16, the guide flange 17 and its own geometric characteristics to achieve its axial and radial limitation.

[0044] The main transmission route of the chain mast with spiral transmission: the DC reduction motor 5 transmits the motion and torque to the worm 4 through the meshing between the motor gear 14 and the worm gear 31. The worm 4 converts the rotation around the horizontal axis into the rotation of the worm gear 3 around the vertical axis through the meshing with the worm wheel 3, and amplifies the torque. The self-locking feature of the worm and worm gear transmission is utilized so that the worm wheel 3 cannot reversely drive the worm 4, thereby achieving the safety requirements of the chain mast. The rotation of the inner hole 225 and the spiral groove 222 of the worm wheel 3 will lift or drop the left chain link 19 and the right chain link 21 meshed into a boss cylinder, thereby realizing the withdrawal and erection of the chain mast. The control panel group 25 automatically controls the withdrawal and erection of the chain mast through the rotation angle of the worm 4 detected by the encoder 34.

[0045] The guide device of the chain link is as follows Figure 2 and 4 As shown, it is mainly composed of a housing 1, a base plate 2, a worm wheel 3, a long optical axis 6, a U-shaped guide plate 7, an upper cover plate 10, a short optical axis 11, a chain link seat 12, a guide flange 17, a flange 18, a connecting column 29, a guide plate 30, etc. Among them, the housing 1 is connected to the base plate 2 through a positioning surface 239, and the guide devices of the left and right chains are arranged symmetrically about the center plane of the chain mast. The guide plate 30, the long optical axis 6, and the U-shaped guide plate 7 are installed on the positioning profile of the base plate 2. The short optical axis 11 is installed on the positioning profile of the upper cover plate 10. The upper cover plate 10 is fixedly connected to the base plate 2 and the housing 1 through the U-shaped guide plate 7, the chain link seat 12, and the connecting rod 32, and an end cover plate 8 and a cover 27 are provided on the outside for protection. A protective sleeve 23 is provided between the guide flange 17 and the flange 18 to protect the chain link, and is fixed by a clamp 24. The worm wheel 3 is used to radially limit the cylinder formed by the meshing of the left and right links; the guide flange 17 is used to circumferentially limit the guide boss 213 formed by the meshing of the left and right links; the flange 18 envelops the upper half of the meshed left and right links to achieve a fixed connection with the left and right links; the guide surface 233 of the housing 1 and the guide plate 30 together provide guidance for the left and right links 19 and 21 to enter and disengage from the meshing; the long optical axis 6, the U-shaped guide plate 7, and the short optical axis 11 form the retracting and extending guide of the left and right links. Figure 4 As shown, the two guide grooves 207 on the left link 19 are in sliding contact with the guide plate 30, the long optical axis 6, and the short optical axis 11 to achieve guidance. The withdrawal guidance of the right link 21 is the same as that of the left link 19, and will not be repeated.

[0046] The control panel group 25 and the motor worm seat 15 are located on both sides of the housing 1, and an electrical connector 26 is provided on the side of the control panel group 25. A threading hole is provided between the two sides to lead the power supply of the motor 5 and the signal of the encoder 34 to the control panel group 25, and the wire harness of the two waist-shaped threading holes of the left chain link 19 is led to the right side, and the wire harness through the two waist-shaped threading holes of the right chain link 21 directly enters the side of the control panel group 25. The electrical connector 26 connects the communication power supply of the control panel group 25 and the cables built into the mast with the outside to realize the control of the chain mast and its load. It can be seen that the wire harness for transmitting signals at the top and bottom of the chain mast is arranged in the waist-shaped threading holes of the left and right chain links, and moves together with the rise or fall of the chain links, without any auxiliary wire collection and release device attached.

[0047] The working process of the chain mast with screw drive is as follows: Fig.10 , Fig.11 When the chain mast erection command is issued externally, the control board group 25 detects the rotation angle of the worm 4 fed back by the encoder 34. When the flange 18 is not raised to the right position, the control board group 25 controls the DC reduction motor 5 to drive the worm 4 to rotate forward, and the worm wheel 3 meshing therewith rotates clockwise around the horizontal axis, and the spiral groove built into the worm wheel 3 pushes the cylinder with a part of the external thread formed by the meshing of the left chain link 19 and the right chain link to rise. As the left chain link 19 and the right chain link 21 enter into meshing along the left chain guide device in sequence along the right chain guide device, the flange 18 gradually rises. When the flange 18 is raised to the right position, that is, the rotation angle of the worm 4 fed back by the encoder 34 is in place, the control board group 25 stops driving the motor 5, and the chain mast erection is completed; when the chain mast withdrawal command is issued externally, the control board group 25 detects the rotation angle of the worm 4 fed back by the encoder 34, that is, when the flange 18 is not lowered to the right position, the control board group 25 controls the DC reduction motor 5 to stop driving the motor 5, and the chain mast erection is completed. The speed motor 5 drives the worm 4 to rotate in the opposite direction, and the worm wheel 3 meshing therewith rotates counterclockwise around the horizontal axis, and the spiral groove built into the worm wheel 3 drives the partially externally threaded cylinder formed by the meshing of the left chain link 19 and the right chain link to descend, and the left and right chain links are disengaged through the joint action of the guide plate 30 and the guide surface of the housing 1, and the left chain enters the left chain box along the left chain guide device, and the right chain enters the right chain box along the right chain guide device. When the flange 18 is lowered into place, that is, the rotation angle of the worm 4 fed back by the encoder 34 is in place, the control board group 25 stops driving the DC speed reduction motor 5, and the chain mast is withdrawn; when the outside issues a stop command during the erection or withdrawal of the chain mast, the control board group 25 stops driving the motor 5, and the chain mast stops moving. Although the chain mast and its load have their own weight, since the worm wheel 3 cannot reversely drive the worm 4, it can meet the requirements of safety and arbitrary height erection.

Claims

1. A chain mast with screw drive, Features: It comprises a housing (1), a worm wheel (3), a worm (4), a DC reduction motor (5), a motor gear (14), an upper tapered roller bearing (16), a guide flange (17), a flange plate (18), a first chain link (19), a second chain link (21), a control board assembly (25), a lower tapered roller bearing (28), a worm gear (31) and an encoder (34); A lower tapered roller bearing (28), a worm wheel (3), an upper tapered roller bearing (16), and a guide flange (17) are coaxially arranged in sequence in the vertical axis direction inside the housing (1); the worm wheel (3) is rotationally connected to the housing (1) in the vertical axis direction via the lower tapered roller bearing (28) and the upper tapered roller bearing (16); a first chain consisting of a plurality of first chain links (19) is started from one side of the housing (1); and a second chain consisting of a plurality of second chain links (21) is started from the other side of the housing (1), and passes through the worm wheel (3) and the guide flange (17) in sequence; a flange plate (18) is arranged on the top of the chain; a DC reduction motor (5) and a worm (4) are arranged in an upper cavity on one side of the housing (1); The shaft ends of the DC reduction motor (5) and the worm (4) are respectively provided with a motor gear (14) and a worm gear (31), the motor gear (14) and the worm gear (31) are meshed for transmission, the other shaft end of the worm (4) is provided with an encoder (34), the worm (4) and the worm wheel (3) are meshed for transmission; a control board group (25) is provided in the upper cavity on the other side of the housing (1), which receives the position signal fed back by the encoder (34) and controls the DC reduction motor (5); the DC reduction motor (5) and the worm (4) realize power and motion transmission through the meshing transmission of the motor gear (14) and the worm gear (31), and the meshing transmission of the worm (4) and the worm wheel (3) transmits the rotation of the worm (4) to the worm wheel (3); The first chain link (19) and the second chain link (21) are meshed to form a cylinder with a boss, and the boss is staggered and arranged on the outside of the cylinder; the subsequent first chain link (19) and the second chain link (21) together form the next cylinder, and the upper and lower cylinder segments are meshed through the profile to form a longer cylinder, until the first chain link (19) and the second chain link (21) and their adjacent chain links are meshed to achieve the load-bearing and erection requirements of the mast; The worm wheel (3) has a spiral groove built in, and its axis is vertical and coaxial with a cylinder with a boss formed by meshing with the first chain link (19) and the second chain link (21); the output shaft of the DC reduction motor (5) is parallel to the axis of the worm (4), and the motor gear (14) on the motor output shaft meshes with the worm gear (31) mounted on the shaft end of the worm (4) to transmit motion and torque; When the worm wheel (3) rotates around the longitudinal axis, it pushes the cylinder formed by the meshing of the first chain link (19) and the second chain link (21) to move along its axis; The first chain link (19) is provided with a first profile (206) and a second profile (210) on the upper and lower sides thereof, respectively, and a third profile (208) is provided on the right side thereof, and is provided with two chain guide grooves (207). The front and rear surfaces of the first chain link (19) are part of the outer cylindrical surface (209). The upper and lower parts of the left side thereof are provided with first hinge holes (203) connected to the front and rear first chain links. , a second hinge hole (211), a first convex cylinder (201) with a horizontal axis is provided on the left side of the first chain link (19) beyond the outer cylindrical surface, and two waist-shaped threading holes (205) are provided in the middle of the first chain link (19); the first chain link (19) is hinged to the previous first chain link (19) through a short chain link shaft (9) inserted into the first hinge hole (203), and the first chain link (19) is hinged to the next first chain link (19) through a short chain link shaft (9) inserted into the second hinge hole (211), so as to sequentially form a first chain; The upper and lower sides of the second chain link (21) are respectively provided with a first profile (206) and a second profile (210) which mesh with the front and rear second chain links (21); the left side of the second chain link (21) is provided with a third profile (208) which meshes with the first chain link (19); the third profile (208) is provided with two chain collection guide grooves (207); the front and rear surfaces of the second chain link (21) are part of the outer cylindrical surface (209); the upper and lower parts of the left side of the second chain link (21) are provided with first hinge holes (203) which are connected with the front and rear first chain links , a second hinge hole (211), a second convex cylinder (202) with a horizontal axis is provided on the right side of the second chain link (21) beyond the outer cylindrical surface, and two waist-shaped threading through holes (205) are provided in the middle of the second chain link (21); the second chain link (21) is hinged to the previous second chain link (21) through a short chain link shaft (9) inserted into the first hinge hole (203), and the second chain link (21) is hinged to the next second chain link (21) through a short chain link shaft (9) inserted into the second hinge hole (211), so as to sequentially form a second chain.

2. The chain mast according to claim 1, Features: The waist-shaped wire threading through holes (205) of the first chain link (19) and the second chain link (21) are located at four corners of the meshing cylinder formed by the first chain link (19) and the second chain link (21); cables (20) are arranged in the waist-shaped through holes of the first chain link (19) and the second chain link (21) for signal transmission between the top and the bottom of the chain mast.

3. The chain mast according to claim 1, Features: The guide plate (30) is in the shape of a human and is located in the internal cavity at the lower part of the housing (1); the guide flange (17), the guide plate (30) and the internal spiral groove of the worm wheel (3) together complete the guiding function of the engagement and disengagement of the first chain link (19) and the second chain link (21).

4. The chain mast according to claim 1, Features: The control board group (25) controls the on and off of the DC reduction motor (5) according to the rotation angle of the worm (4) fed back by the encoder (34), thereby realizing closed-loop control of the chain mast stroke.

5. The chain mast according to claim 1, Features: When the mast needs to be erected, the control board group (25) determines whether the mast is erected in place according to the rotation angle of the worm (4) fed back by the encoder (34). If not, the DC reduction motor (5) is driven through the worm (4) to drive the worm wheel (3) meshing therewith to rotate around the vertical axis, and the first chain link (19) and the second chain link (21) after meshing are raised together through the spiral groove of the worm wheel (3). Through the combined action of the guide plate (30) and the spiral groove built into the worm wheel (3), the first chain and the second chain enter into meshing. When the mast is erected in place, that is, when the rotation angle signal fed back by the encoder (34) to the control board group (25) reaches the target value, the control board group (25) stops driving the DC reduction motor (5), and the mast erection is completed. When the mast needs to be retracted, the control board group (25) determines whether the mast has been retracted in place according to the rotation angle of the worm (4) fed back by the encoder (34). If not, the DC reduction motor (5) is driven through the worm (4) to drive the worm wheel (3) meshing therewith to rotate in the opposite direction around the vertical axis, and the first chain link (19) and the second chain link (21) meshing therewith are lowered together through the spiral groove of the worm wheel (3). The first chain and the second chain are disengaged through the combined action of the guide plate (30) and the spiral groove built into the worm wheel (3). When the mast has been retracted in place, that is, when the rotation angle signal fed back by the encoder (34) to the control board group (25) reaches the target value, the control board group (25) stops driving the DC reduction motor (5), and the mast is retracted.

6. The chain mast according to claim 1, Features: The withdrawal guide device of the first chain link (19) is located on one side of the housing (1), and comprises a bottom plate (2), a guide plate (30), a long optical axis (6), a U-shaped guide plate (7), a short optical axis (11), and an upper cover plate (10); the bottom plate (2) is fixed to the bottom of the housing (1) by screws, and provides a mounting surface, on which the U-shaped guide plate (7), the long optical axis (6), and the guide plate (30) are arranged in sequence; an upper cover plate (10) is arranged on one side of the housing (1), and a short optical axis (11) is arranged below the upper cover plate (10), and one end of the short optical axis (11) is connected to a guiding end of the U-shaped guide plate (7); a half portion of one side of the guide plate (30), the long optical axis (6), the U-shaped guide plate (7), and the short optical axis (11) form a "U"-shaped first chain withdrawal guide channel rotated 90 degrees clockwise on one side of the housing (1).

7. The chain mast according to claim 1, Features: The second chain withdrawal guide device composed of the second chain link (21) is located on the other side of the housing (1), and is composed of a base plate (2), a guide plate (30), a long optical axis (6), a U-shaped guide plate (7), a short optical axis (11), and an upper cover plate (10); the base plate (2) provides a mounting surface, on which the U-shaped guide plate (7), the long optical axis (6), and the guide plate (30) are arranged in sequence; the upper cover plate (10) is arranged on the other side of the housing (1), and the short optical axis (11) is arranged below the upper cover plate (10), and one end of the short optical axis (11) is connected to the guiding end of the U-shaped guide plate (7); the other half of the guide plate (30), the long optical axis (6), the U-shaped guide plate (7), and the short optical axis (11) form a "U"-shaped second chain withdrawal guide channel rotated 90 degrees counterclockwise on the other side of the housing (1).

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