A forklift frame welding device for electric forklifts

Abstract

This invention relates to the field of forklift manufacturing technology and discloses a welding device for the forklift frame of an electric forklift, including a central tube, an inner sleeve, and an outer sleeve. A welding mechanism for welding operations is arranged at the end of the outer sleeve. Two sets of bevel gear rings, which can be synchronously driven by the same drive structure, are coaxially rotatably mounted on the central tube. One-way elastic locking tooth structures arranged in opposite directions are respectively provided between the inner sleeve, the outer sleeve, and the corresponding bevel gear rings, forming two sets of opposite one-way clutch transmission pairs. This device can achieve independent control of the posture adjustment and welding trajectory movement of the central rod of the forklift frame by controlling the forward and reverse rotation of the motor, thereby effectively adapting to the contour welding requirements of non-circular irregular rods.

Description

Technical Field

[0001] This invention relates to the field of forklift manufacturing, and more particularly to a forklift frame welding device for an electric forklift. Background Technology

[0002] The forklift frame of an electric forklift is the core structure that bears the entire load of the vehicle. The connecting rods in the middle of the frame are often irregularly shaped, non-circular cross-sections, and their welding quality directly determines the overall structural strength and assembly precision of the forklift frame. Currently, existing forklift frame welding equipment has many shortcomings in practical use. Traditional welding equipment often uses a linked structure for the clamping fixtures and welding actuators, resulting in a single transmission method and an inability to independently control workpiece posture adjustment and the circular motion of the welding torch. When welding irregularly shaped forklift frame rods, it is impossible to accurately calibrate the workpiece angle independently, and it is difficult to adapt the welding motion trajectory to the irregular contour, easily leading to quality defects such as uneven weld width, welding misalignment, and incomplete welds, resulting in a low product qualification rate. Furthermore, the workpiece clamping telescopic drive structure of existing equipment is mostly directly exposed in the welding operation area. High-temperature welding slag and metal spatter generated during welding easily adhere to and burn the telescopic components and transmission parts, causing component jamming, wear, and damage. This not only increases the probability of equipment failure and maintenance costs but also reduces the equipment's service life. Furthermore, traditional equipment has limited adjustment dimensions, making it difficult to adapt to the processing of forklift frame members of different sizes and irregular cross-sections. It has poor versatility and cannot meet the high-precision and high-efficiency welding processing requirements of mass production of electric forklifts. Therefore, this invention proposes a forklift frame welding device for electric forklifts to solve the above problems. Summary of the Invention

[0003] To address the aforementioned problems, this invention provides a forklift frame welding device for electric forklifts.

[0004] The forklift frame welding equipment for electric forklifts provided by this invention adopts the following technical solution:

[0005] A forklift frame welding device for an electric forklift, comprising:

[0006] The intermediate tube is used to connect to the external transmission mechanism;

[0007] The inner sleeve is rotatably connected to one end of the intermediate tube, and a clamping structure is provided inside the sleeve.

[0008] The outer sleeve is coaxially disposed outside the inner sleeve;

[0009] The welding mechanism is located at the end of the outer sleeve furthest from the middle tube.

[0010] Among them, the inner sleeve and the outer sleeve are evenly distributed with elastic retaining teeth on the side wall of the end near the middle tube, and the elastic retaining teeth on the side wall of the inner sleeve and the outer sleeve are arranged in opposite directions; the middle tube is also equipped with a conical tooth ring a and a conical tooth ring b that rotate coaxially, and the bottom of the conical tooth ring a and the conical tooth ring b are both arranged with elastic retaining teeth in a ring array.

[0011] The inner sleeve and the bevel ring a slide relative to each other clockwise, the inner sleeve and the bevel ring a rotate relative to each other, and are limited to a counterclockwise position, with the bevel ring a driving the inner sleeve.

[0012] The outer sleeve and the bevel ring b slide counterclockwise relative to each other through their elastic retaining teeth, the outer sleeve rod and the bevel ring b rotate relative to each other, and are limited clockwise, with the bevel ring b driving the outer sleeve.

[0013] The bevel ring a and bevel ring b are driven by the drive structure simultaneously.

[0014] Preferably, the inner sleeve is provided with an outwardly protruding collar at one end near the middle tube, and the end face of the collar is embedded with an elastically connected elastic tooth a, which extends outward through the end face of the collar.

[0015] The conical ring a is embedded with an elastic retaining tooth c, which penetrates the end face of the conical ring c near the inner sleeve.

[0016] Both the elastic tooth a and the elastic tooth c have a right-angled triangular cross-section, and one of the vertical end faces of the elastic tooth a and the elastic tooth c are arranged to abut against each other, while the inclined surfaces are arranged to be parallel.

[0017] Preferably, the outer sleeve has an elastic tooth b embedded in one end near the middle tube, and the elastic tooth b extends outward through the end face of the collar.

[0018] The conical ring b is embedded with an elastic retaining tooth d, which penetrates the end face of the conical ring b near the outer sleeve.

[0019] Both the elastic tooth b and the elastic tooth d have right-angled triangular cross sections, and one of the vertical end faces of the elastic tooth b and the elastic tooth d are arranged to abut against each other, while the inclined surfaces are arranged to be parallel.

[0020] Preferably, the elastic locking teeth a and b are arranged in opposite directions.

[0021] Preferably, the clamping structure includes a telescopic cylinder d arranged in a ring on it, the telescopic cylinder d is disposed through the inner sleeve, and its output end is fixedly connected to a clamping block disposed inside the inner sleeve.

[0022] Preferably, the outer sleeve has a two-section structure, and the two sections are connected by a ring array of connecting ribs, with the connecting ribs located on the outside of the telescopic cylinder d.

[0023] Preferably, the welding mechanism includes a linear module b fixedly connected to the end of the outer tube away from the middle tube, and a slider is connected to the output end of the linear module b. A telescopic cylinder a is fixedly connected to the slider perpendicularly to its end face. The output end of the telescopic cylinder a is fixedly connected to the telescopic cylinder b perpendicularly, and the output end of the telescopic cylinder b is fixedly connected to the telescopic cylinder c perpendicularly. The welding mechanism also includes a welding module fixed to the output end of the telescopic cylinder c.

[0024] Preferably, a connecting rod is welded to the middle section of the intermediate tube, and motors are fixedly connected to both sides of the connecting rod via mounting plates. A bevel gear that meshes with both bevel ring a and bevel ring b is fixedly connected to the output end of the motor, and the bevel gear simultaneously drives bevel ring a and bevel ring b.

[0025] Preferably, both ends of the intermediate tube are welded with convex rings that cooperate with the inner sleeve collar, and the convex rings and the collar are axially limited.

[0026] Preferably, a linear module a is provided above the intermediate tube, and the connecting rod is mounted on the built-in sliding component of the linear module a.

[0027] In summary, the present invention has at least one of the following beneficial technical effects:

[0028] This equipment adopts a reverse one-way toothed clutch transmission structure. Through the same set of drive structures, it synchronously drives two sets of bevel gear rings to rotate. By switching between forward and reverse rotation of the motor, the movement of the inner sleeve and the outer sleeve can be controlled independently. When rotating clockwise, the inner sleeve can be driven to rotate and adjust the angle of the forklift frame rod, completing the precise calibration of the workpiece welding posture. When rotating counterclockwise, the inner sleeve is locked and fixed, and the outer sleeve rotates independently, driving the welding mechanism to move along the circumference of the workpiece. This completely solves the drawback of traditional equipment where the clamping fixture and welding mechanism are linked and cannot be adjusted independently. It is precisely adapted to the irregular trajectory welding of non-circular forklift frame intermediate rods, greatly improving welding accuracy and product qualification rate.

[0029] This equipment features a multi-dimensional adjustable welding mechanism. Through multiple sets of orthogonally arranged telescopic cylinders and linear modules, it can achieve precise micro-adjustment of the welding module in multiple directions. Combined with the telescopic clamping structure of the ring array, it can adapt to the clamping and welding of intermediate rods of forklift frames with different pipe diameters and irregular cross-sections. The equipment has high adjustment flexibility and strong versatility, which can meet the processing needs of mass standardized production of electric forklifts and effectively improve production efficiency. Attached Figure Description

[0030] Figure 1 This is an isometric structural schematic diagram of an embodiment of the invention.

[0031] Figure 2 This is an exploded view of an embodiment of the invention.

[0032] Figure 3 This is a structural diagram of the clamping component according to an embodiment of the invention.

[0033] Figure 4 This is a schematic diagram of the bevel gear ring structure according to an embodiment of the invention.

[0034] Explanation of reference numerals in the attached drawings: 1. Linear module a; 2. Intermediate tube; 21. Convex ring; 3. Connecting rod; 4. Motor; 41. Bevel gear; 5. Inner sleeve; 51. Collar; 52. Elastic retaining tooth a; 6. Outer sleeve; 61. Connecting rib; 62. Elastic retaining tooth c; 7. Bevel ring a; 71. Elastic retaining tooth b; 8. Bevel ring b; 81. Elastic retaining tooth d; 9. Linear module b; 10. Slider; 11. Telescopic cylinder a; 12. Telescopic cylinder b; 13. Telescopic cylinder c; 14. Telescopic cylinder d; 15. Clamping block. Detailed Implementation

[0035] The following is in conjunction with the appendix Figure 1 - Appendix Figure 4 The present invention will be described in further detail below.

[0036] Example 1: Refer to Figure 1 - Figure 4 A forklift frame welding device for an electric forklift includes a linear module a1 vertically suspended above the device. A connecting rod 3 is slidably mounted on the sliding component of the linear module a1. The lower end of the connecting rod 3 is fixed to the middle section of the intermediate tube 2. The linear module a1 can drive the intermediate tube 2 and the entire set of clamping and transmission components at both ends to slide back and forth along the axis of the intermediate tube via the connecting rod 3, thereby realizing the pulling and displacement of the workpiece. Motors 4 are fixed on both sides of the connecting rod 3 by mounting plates. A bevel gear 41 is mounted on the output end of the motor 4. A rotatable bevel gear ring a7 and a bevel gear ring b8 are coaxially mounted on the outer wall of the intermediate tube 2. The bevel gear 41 meshes with the bevel teeth of the two bevel gear rings simultaneously. The operation of a single motor can synchronously drive the two sets of bevel gear rings to rotate in the same direction.

[0037] The outer walls of the left and right ends of the intermediate tube 2 are integrally formed with convex rings 21. The inner sleeve 5 is coaxially rotated and assembled at the end of the intermediate tube 2. The convex rings 21 and the collars 51 at the end of the inner sleeve 5 are axially limited to restrict the axial movement of the inner sleeve. The inner sleeve 5 has elastic teeth a52 elastically arranged on the end face of the collar 51 facing the bevel gear a7. The corresponding end face of the bevel gear a7 is equipped with elastic teeth c62. Both types of teeth have right-angled triangular cross sections, with the vertical surfaces pressing against each other and the inclined surfaces parallel, forming a one-way clutch pair that locks in the clockwise direction and slips in the counterclockwise direction. The outer sleeve 6 is coaxially arranged on the outer side of the inner sleeve 5. The end face of the outer sleeve 6 facing the bevel gear b8 is embedded with elastic teeth b71. The end face of the bevel gear b8 is matched with elastic teeth d81. Both of them are also right-angled triangular teeth structures. The arrangement direction of the teeth is opposite to that of the inner sleeve side, forming a clutch structure that locks in the counterclockwise direction and slips in the clockwise direction. The elastic teeth a52 and the elastic teeth b71 are arranged in opposite directions.

[0038] The inner sleeve 5 has a ring-shaped array of multiple telescopic cylinders d14 inside. The cylinder body of the telescopic cylinder d14 extends out of the inner sleeve wall, and the piston rod is connected to the clamping block 15 inward. The multiple clamping blocks can clamp and fix the middle rod of the forklift frame by synchronously gathering, thus forming a workpiece clamping structure. The outer sleeve 6 adopts a two-section split structure. The two sections of the tube are connected into one by the connecting ribs 61 arranged in a circumferential array. All the connecting ribs surround the periphery of the telescopic cylinder d14, shielding the welding spatter and protecting the clamping drive components.

[0039] A linear module b9 is fixedly installed at the outer end of the outer tube 6 away from the middle tube 2. A slider 10 is slidably assembled on the linear module b9. Telescopic cylinders a11, b12, and c13 are sequentially and vertically assembled on the slider 10. The axes of the three telescopic cylinders are arranged orthogonally in pairs. A welding module is fixed at the end of the telescopic cylinder c13. Together, they form a multi-axis adjustable welding mechanism. The mechanism can achieve circumferential welding as the outer tube rotates. It can also independently fine-tune the position of the welding gun after the workpiece moves outward to complete the outer butt welding.

[0040] The actual working steps of this equipment are as follows:

[0041] Step 1: Insert the middle load-bearing rod of the electric forklift into the inner sleeve, activate each telescopic cylinder d14 to push the clamping block to close and clamp the workpiece, and complete the centering and clamping of the rod.

[0042] Step 2: Start the motor and run it clockwise. The bevel gear synchronously drives the bevel ring a7 and bevel ring b8 to rotate in the same direction. The bevel ring a7 drives the inner sleeve and the inner workpiece to rotate through the meshing of the teeth, and finely adjusts the circumferential weld angle of the workpiece. The bevel ring b8 rotates relative to the outer sleeve. The outer sleeve and the end welding mechanism remain stationary. After the workpiece angle is adjusted to the correct position, turn off the motor.

[0043] Step 3: The motor switches to counterclockwise operation. At this time, the bevel ring a7 slips and rotates freely with the inner sleeve, and the workpiece remains fixed. The bevel ring b8 clamps the outer sleeve and, together with the linear module b9 and the entire welding mechanism, rotates around the outer circumference of the workpiece. The linear module b9 and the three sets of telescopic cylinders adjust the welding gun coordinates in real time to complete the fully automatic welding of the annular bevel weld at one end of the workpiece.

[0044] Step 4: After the single-end circumferential weld is completed, control the linear module a1 to start. The connecting rod 3 pulls the intermediate tube, inner sleeve and the clamped intermediate rod in an axial direction away from the welding mechanism, so that the end of the rod to be welded is pulled out from the annular space of the welding mechanism, so that the end of the intermediate rod to be joined is completely in the open working area outside the welding mechanism. Then, the side support rod of the forklift frame is pre-installed and attached to the exposed end of the intermediate rod. The three-axis telescopic cylinder is finely adjusted again to drive the welding gun displacement, and the butt weld between the intermediate rod and the side rod is smoothly completed in the external space of the frame.

[0045] Step 5: After all the welding of the entire rod is completed, the telescopic cylinder d14 retracts to release the clamping block, remove the semi-finished forklift frame rod, and repeat the above process for mass production.

[0046] It should be noted that, in this document, terms such as “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0047] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A forklift frame welding device for an electric forklift, characterized in that, include: The intermediate tube (2) is used to connect with the external transmission mechanism; The inner sleeve (5) is rotatably connected to one end of the intermediate tube (2), and a clamping structure is provided inside the sleeve; The outer sleeve (6) is coaxially disposed outside the inner sleeve (5); The welding mechanism is located at the end of the outer tube (6) away from the middle tube (2); Among them, the inner sleeve (5) and the outer sleeve (6) are evenly distributed with elastic teeth on the side wall of the end near the middle tube (2), and the elastic teeth on the side wall of the inner sleeve (5) and the outer sleeve (6) are arranged in opposite directions; the middle tube (2) is also equipped with a conical tooth ring a (7) and a conical tooth ring b (8) that rotate coaxially, and the bottom of the conical tooth ring a (7) and the conical tooth ring b (8) are arranged with elastic teeth in a ring array; The inner sleeve (5) and the bevel ring a (7) slide clockwise relative to each other, the inner sleeve (5) and the bevel ring a (7) rotate relative to each other, and are limited counterclockwise, and the bevel ring a (7) drives the inner sleeve (5). The outer sleeve (6) and the bevel ring b (8) slide counterclockwise relative to each other, the outer sleeve rod and the bevel ring b (8) rotate relative to each other, and are limited clockwise, and the bevel ring b (8) drives the outer sleeve (6); The bevel ring a (7) and bevel ring b (8) are driven by the drive structure simultaneously.

2. The forklift frame welding equipment for an electric forklift according to claim 1, characterized in that: The inner sleeve (5) is provided with an outwardly protruding collar (51) at one end near the middle tube (2), and an elastic tooth a (52) is embedded on the end face of the collar (51), which extends outward through the end face of the collar (51). The conical ring a (7) is provided with an elastic retaining tooth c (62), which is provided through the end face of the conical ring c near the inner sleeve (5). The longitudinal sections of the elastic tooth a (52) and the elastic tooth c (62) are both right-angled triangular structures, and one of the vertical end faces of the elastic tooth a (52) and the elastic tooth c (62) are set to abut against each other, while the inclined surfaces are set to be parallel.

3. The forklift frame welding equipment for an electric forklift according to claim 2, characterized in that: The outer sleeve (6) has an elastic tooth b (71) embedded in one end near the middle tube (2), and the elastic tooth b (71) extends outward through the end face of the collar (51). The conical ring b (8) is embedded with an elastic retaining tooth d (81), which is disposed through the end face of the conical ring b (8) near the outer sleeve (6). The longitudinal sections of the elastic tooth b (71) and the elastic tooth d (81) are both right-angled triangular structures, and one of the vertical end faces of the elastic tooth b (71) and the elastic tooth d (81) are set to abut against each other, while the inclined surfaces are set to be parallel to each other.

4. The forklift frame welding equipment for an electric forklift according to claim 3, characterized in that: The elastic locking teeth a (52) and b (71) are arranged in opposite directions.

5. The forklift frame welding equipment for an electric forklift according to claim 1, characterized in that: The clamping structure includes a telescopic cylinder d (14) arranged in a ring on it. The telescopic cylinder d (14) is set through the inner sleeve (5), and its output end is fixedly connected to a clamping block (15) set inside the inner sleeve (5).

6. The forklift frame welding equipment for an electric forklift according to claim 5, characterized in that: The outer sleeve (6) has a two-section structure, and the two sections are connected by a ring array of connecting ribs (61), and the connecting ribs (61) are located on the outside of the telescopic cylinder d (14).

7. The forklift frame welding equipment for an electric forklift according to claim 1, characterized in that: The welding mechanism includes a linear module b (9) fixedly connected to the end of the outer tube (6) away from the middle tube (2), and the output end of the linear module b (9) is connected to a slider (10). A telescopic cylinder a (11) is fixedly connected to the slider (10) perpendicular to its end face. The output end of the telescopic cylinder a (11) is fixedly connected to a telescopic cylinder b (12) perpendicularly, and the output end of the telescopic cylinder b (12) is fixedly connected to a telescopic cylinder c (13) perpendicularly. The welding mechanism also includes a welding module fixed to the output end of the telescopic cylinder c (13).

8. The forklift frame welding equipment for an electric forklift according to claim 1, characterized in that: A connecting rod (3) is welded to the middle section of the intermediate tube (2), and motors (4) are fixedly connected to both sides of the connecting rod (3) through mounting plates. A bevel gear (41) is fixedly connected to the output end of the motor (4) and meshes with both bevel ring a (7) and bevel ring b (8). The bevel gear (41) simultaneously drives bevel ring a (7) and bevel ring b (8).

9. The forklift frame welding equipment for an electric forklift according to claim 8, characterized in that: Both ends of the intermediate tube (2) are welded with a convex ring (21) that matches the inner sleeve (5) collar (51), and the convex ring (21) and the collar (51) are axially limited.

10. The forklift frame welding equipment for an electric forklift according to claim 9, characterized in that: A linear module a (1) is provided above the intermediate tube (2), and the connecting rod (3) is installed on the built-in sliding component of the linear module a (1).

Images