An automatic clamping device for concrete pump truck cylinder assembly welding

Abstract

This invention discloses an automated clamping device for welding cylindrical components of concrete pump trucks, aiming to solve the problems of time-consuming and labor-intensive manual clamping, low positioning accuracy, and inability to achieve automated welding due to improper clamping in existing technologies. The device includes a tooling platform equipped with hydraulic cylinders and multiple telescopic cylinders. The output shafts of the hydraulic cylinders are connected to a tensioning and limiting mechanism. The telescopic shafts of the telescopic cylinders are connected to a rotary clamping mechanism for fixing the medium-sized cylindrical components. A rotary clamping mechanism is also provided around the periphery of the tooling platform. The tooling platform is connected to the slewing bearing of a positioner, which can rotate the tooling platform and the cylindrical components together to facilitate welding operations. Based on the structural characteristics of large-sized and medium-sized cylindrical components, this invention assembles two clamping systems onto a single tooling, employing fully hydraulic automatic clamping for accurate positioning, which is superior to manual tooling.

Description

Technical Field

[0001] This invention relates to an automated clamping device for welding cylindrical components of concrete pump trucks, belonging to the field of concrete equipment manufacturing technology. Background Technology

[0002] Currently, the welding fixture for the cylindrical components of concrete pump trucks is manually clamped. The original manual welding fixture required manual selection of the guide screw to achieve the function of automatic centering. This method is time-consuming and labor-intensive, especially for cylindrical components weighing over 500kg. When manually tightening the guide screw, the friction exceeds 1000KN, resulting in high labor intensity.

[0003] Automated welding requires repeatable workpiece clamping, meaning that each subsequent workpiece must be in the same position and angle as the previous one so that the robot can continue using the welding program from the previous workpiece. The original manual tooling could not meet this repeatability requirement; it only allowed the cylinder to self-center using pins, which was insufficient for the robot's repeatability. Each time a workpiece was welded, the starting point had to be repositioned. This lack of effective positioning resulted in deviations in the workpiece's installation angle each time, sometimes exceeding 10mm.

[0004] Furthermore, because both the size and length of the meter have weld seams on both sides, they cannot be clamped and welded in one go; a second clamping and splicing process is required, increasing the production cycle time by at least 30 minutes. For example... Figure 10 As shown, manual tooling has only two clamping positions, which cannot accommodate the process allowance of large-diameter cylinders. Even if an automatic clamping device is installed, it cannot effectively clamp the workpiece. During the workpiece flipping and welding process, it is very easy for it to move or fall, causing safety accidents.

[0005] In summary, manual clamping has disadvantages such as long clamping time, large clamping torque, the need for secondary clamping, which is time-consuming, labor-intensive, and relatively low production efficiency. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide an automated clamping device for welding cylindrical components of concrete pump trucks. Based on the structural characteristics of large-diameter and medium-diameter cylindrical components, two clamping systems are assembled on one tooling, and all are hydraulically automatically clamped, which is superior to manual tooling.

[0007] To achieve the above objectives, the present invention is implemented using the following technical solution: an automated clamping device for welding cylindrical components of concrete pump trucks, wherein the cylindrical components include large-diameter cylindrical components and medium-diameter cylindrical components, and includes a tooling platform on which hydraulic cylinders and multiple telescopic cylinders are arranged.

[0008] The output shaft of the hydraulic cylinder is connected to the tensioning and limiting mechanism. The hydraulic cylinder can drive the tensioning and limiting mechanism and the cylindrical assembly to move closer to or away from the center of the tooling platform until the center of the cylindrical assembly coincides with the center of the tooling platform.

[0009] The telescopic shafts of the telescopic cylinders are all connected to the rotary clamping mechanism used to fix the millet counting cylinder assembly. The telescopic cylinders can drive the rotary clamping mechanism to move closer to or away from the large rice counting cylinder assembly. The tooling platform is also equipped with a rotary clamping mechanism for fixing the large rice counting cylinder assembly.

[0010] The tooling platform is connected to the slewing bearing of the positioner below. The positioner can drive the tooling platform and the cylindrical assembly to rotate and change position together, and cooperate with the machine to perform welding operations.

[0011] Optionally, the bottom plate of the rice counting cylinder assembly is provided with a positioning semicircle, and the tooling platform is provided with a positioning pin two that is adapted to the positioning semicircle. The number of positioning pin two is two, and they are arranged symmetrically. The positioning semicircle is fitted onto one of the positioning pin two.

[0012] Optionally, the rice counting cylinder assembly has a rolling process allowance at the corresponding position of the rotating pressing mechanism around the tooling platform.

[0013] Optionally, the lower periphery of the millimeter cylindrical assembly is provided with a cylindrical seat ring for clamping, the cylindrical seat ring is provided with a seat ring reducer hole, and the tooling platform is provided with a positioning pin for positioning the seat ring reducer hole, the positioning pin being symmetrically arranged on both sides of the oil cylinder.

[0014] Optionally, the tooling platform is symmetrically provided with self-centering tension pins. During the tensioning process, the self-centering tension pins limit the movement of the small millimeter cylindrical component, so that the center of the small millimeter cylindrical component coincides with the center of the tooling platform.

[0015] Optionally, the rotary pressing mechanism includes a mounting base, a rotary pressing cylinder, a pressure plate, and a pressing head. The rotary pressing cylinder is located above the mounting base, the pressure plate is sleeved on the output shaft of the rotary pressing cylinder, and the pressing head is located at the end of the pressure plate.

[0016] Optionally, the mounting base of the rotary clamping mechanism connected to the telescopic cylinder is also provided with a stop post, which is used to limit the extension and retraction range of the telescopic shaft.

[0017] Optionally, a proximity switch for monitoring the clamping effect is also included, the proximity switch being located on the side of the clamping head and electrically connected to an external controller.

[0018] Optionally, the tensioning limiting mechanism includes a support and a tensioning limiting block. The tensioning limiting block is located at the end of the support. The support is connected to the output shaft of the hydraulic cylinder. The support is also provided with a self-centering tensioning pin II, which abuts against the inner wall of the large-meter cylindrical assembly during the tensioning process.

[0019] Optionally, the tensioning limit block is provided with an inverted triangular structure, which is used to fix the cylindrical seat ring of the middle millimeter cylindrical assembly during the tensioning process.

[0020] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0021] This invention adds two clamping systems, one for large-scale rice cylinders and the other for medium-scale rice cylinders, to a single tooling. All fixing is achieved by hydraulic automatic clamping. It breaks through by using the process allowance of rolling the large-scale rice cylinder as the clamping point, improving the secondary clamping into a single clamping, and achieving welding of all welds in one clamping, thus improving production efficiency. At the same time, it also takes into account the secondary clamping and automatic clamping welding of medium-scale rice cylinders, providing great convenience for the industrialization of the entire rotary base structure.

[0022] This invention utilizes the seat ring of the medium-sized millet cylindrical component for positioning. The large-sized millet cylindrical component determines the rotation angle of the cylindrical component based on the positioning semicircle on the bottom plate of the cylindrical component. Then, by tightening, it can achieve concentricity with the tooling platform, thereby ensuring that the cylindrical component is in the same position after each clamping, improving the positioning accuracy, so as to facilitate automatic robot positioning and automated welding.

[0023] This invention saves time and effort, is simple to operate, and greatly improves work efficiency. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of an automated clamping device for welding cylindrical components of a concrete pump truck, as described in an embodiment of the present invention.

[0025] Figure 2 This is a schematic diagram of the structure of the rice counting cylinder assembly in an embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of the structure of the millet-count cylindrical assembly in an embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of the structure of an automated clamping device for welding cylindrical components of concrete pump trucks in an embodiment of the present invention, showing how it clamps cylindrical components with a diameter of 1 meter.

[0028] Figure 5 This is a schematic diagram of the structure of an automated clamping device for welding cylindrical components of concrete pump trucks in an embodiment of the present invention, showing how it clamps a number of cylindrical components.

[0029] Figure 6 This is a schematic diagram of the connection relationship between the telescopic cylinder and the rotary pressing mechanism in an embodiment of the present invention;

[0030] Figure 7 This is a schematic diagram of the rotary clamping mechanism in an embodiment of the present invention;

[0031] Figure 8 This is a schematic diagram of the connection relationship between the hydraulic cylinder and the tensioning and limiting mechanism in an embodiment of the present invention;

[0032] Figure 9 This is a schematic diagram of an automated clamping device for welding cylindrical components of a concrete pump truck, used in conjunction with a positioner, in an embodiment of the present invention.

[0033] Figure 10 This is a schematic diagram of a manual clamping device used for welding cylindrical components of concrete pump trucks in the prior art.

[0034] In the diagram: 1 Tooling platform, 2 Large meter cylindrical assembly, 201 Positioning semicircle, 202 Rolling process allowance, 3 Medium millimeter cylindrical assembly, 301 Cylindrical seat ring, 302 Seat ring reducer hole, 4 Positioner, 5 Hydraulic cylinder, 6 Support, 7 Tensioning limit block, 8 Inverted triangle structure, 9 Telescopic cylinder, 10 Mounting base, 11 Rotary pressing mechanism, 12 Rotary pressing cylinder, 13 Pressure plate, 14 Pressing head, 15 Proximity switch, 16 Positioning pin one, 17 Self-centering tensioning pin one, 18 Positioning pin two, 19 Self-centering tensioning pin two, 20 Stop post. Detailed Implementation

[0035] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0036] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0037] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0038] Example 1:

[0039] like Figure 2 and Figure 3 As shown, this embodiment of the invention provides an automated clamping device for welding cylindrical components of concrete pump trucks. The cylindrical components include a large-size cylindrical component 2 and a medium-size cylindrical component 3. The large-size cylindrical component 2 has a rolling process allowance 202 at the rolling point, and a positioning semicircle 201 is provided on the bottom plate. The positioning semicircle 201 is a semicircular notch. The lower periphery of the medium-size cylindrical component 3 is provided with a cylindrical seat ring 301 for mating and clamping. The cylindrical seat ring 301 is provided with a seat ring reducer hole 302.

[0040] like Figure 1 As shown, the automated clamping device includes a tooling platform 1, on which a hydraulic cylinder 5 and three telescopic cylinders 9 are arranged. The hydraulic cylinder 5 and the telescopic cylinders 9 are evenly distributed. The output shaft of the hydraulic cylinder 5 is connected to the tensioning and limiting mechanism. The hydraulic cylinder 5 can drive the tensioning and limiting mechanism and the cylindrical assembly to move closer to or away from the center of the tooling platform 1, so as to facilitate the positioning of the center.

[0041] The centering operation consists of two steps. The first step is to determine the rotation angle of the cylindrical assembly so that the rotation angle of the cylindrical assembly is consistent each time. The second step is to locate the center so that the center of the cylindrical assembly coincides with the center of the tooling platform 1. Only by completing both steps can we ensure that the cylindrical assembly is in the same position after each clamping, thereby improving the positioning accuracy and facilitating automatic robot positioning and automated welding.

[0042] Combination Figure 4 For the rice counting cylinder assembly 2, the tooling platform 1 is equipped with two positioning pins 18 that are compatible with the positioning semicircle 201. The number of positioning pins 18 is two and they are arranged symmetrically. The positioning semicircle 201 is fitted onto one of the positioning pins 18. This ensures that the cylinder assembly can only rotate around the positioning pin 18 during the tensioning process and cannot be displaced. The rotation angle of the rice counting cylinder assembly 2 is thus determined.

[0043] Combination Figure 5For the millimeter cylinder component 3, the tooling platform 1 is provided with positioning pins 16 for positioning the seat ring reducer hole 302. The positioning pins 16 are symmetrically arranged on both sides of the oil cylinder 5. By abutting the seat ring reducer hole 302 with the two positioning pins 16, the rotation angle of the millimeter cylinder component 3 is determined.

[0044] Combination Figure 6 The telescopic shafts of the telescopic cylinder 9 are all connected to the rotary pressing mechanism 11. The telescopic cylinder 9 can drive the rotary pressing mechanism 11 to move closer to or away from the large rice counting cylinder assembly 1. The rotary pressing mechanism 11 is divided into two parts. One part is connected to the telescopic cylinder 9 and is used to fix the medium rice counting cylinder assembly 3. The other part is evenly distributed around the tooling platform 1 and is used to fix the large rice counting cylinder assembly 2.

[0045] like Figure 9 As shown, the tooling platform 1 is connected to the slewing bearing of the positioner 4 below. The positioner 4 can drive the tooling platform 1 and the cylindrical assembly to flip and rotate together to cooperate with the machine for welding operations.

[0046] Example 2:

[0047] Combination Figure 8 Based on Embodiment 1, the tensioning limiting mechanism of this embodiment includes a support 6 and a tensioning limiting block 7. The support 6 is connected to the output shaft of the oil cylinder 5. The tensioning limiting block 7 is located at the end of the support 6 and has an inverted triangular structure 8. The inverted triangular structure 8 can press down the cylindrical seat ring 301 of the millimeter cylindrical assembly 3 during the tensioning process.

[0048] A self-centering tension pin 17 is symmetrically provided on the tooling platform 1. The self-centering tension pin 17 is located inside the middle millimeter cylinder assembly 3. When the oil cylinder 5 pulls the middle millimeter cylinder assembly 3 through the tensioning and limiting mechanism, the middle millimeter cylinder assembly 3 will move to one side of the oil cylinder 5 until the self-centering tension pin 17 abuts against the inner wall of the cylinder of the middle millimeter cylinder assembly 3. At this time, the oil cylinder 5 stops, and the center of the middle millimeter cylinder assembly 3 coincides with the center of the tooling platform 1.

[0049] The support 6 is also equipped with a self-centering tensioning pin 19. During the tensioning process, when the self-centering tensioning pin 19 abuts against the inner wall of the rice counting cylinder assembly 2, it will drive the rice counting cylinder assembly 2 to move together towards the side of the oil cylinder 5 until the positioning pin 18, which is not fitted with the positioning semicircle 201, abuts against the rice counting cylinder assembly 2. At this time, the oil cylinder 5 stops, and the center of the rice counting cylinder assembly 2 coincides with the center of the tooling platform 1.

[0050] Example 3:

[0051] Combination Figure 7Based on Embodiment 2, the rotary clamping mechanism 11 in this embodiment includes a mounting base 10, a rotary pressing cylinder 12, a pressure plate 13, and a clamping head 14. The rotary pressing cylinder 12 is located above the mounting base 10, the pressure plate 13 is sleeved on the output shaft of the rotary pressing cylinder 12, and the clamping head 14 is located at the end of the pressure plate 13. When the rotary pressing cylinder 12 is activated, it can drive the pressure plate 13 to move downward while rotating it 90 degrees, thereby fixing and clamping the cylindrical assembly through the clamping head 14.

[0052] The mounting base 10 of the rotary pressing mechanism 11, which is connected to the telescopic cylinder 9, is equipped with a stop post 20. The stop post 20 is located on the side of the mounting base 10 that connects to the telescopic shaft, and is used to limit the telescopic range of the telescopic shaft. The telescopic cylinder used has a very small pulling force. When the stop post 20 touches the inner wall of the millimeter-sized cylindrical assembly 3, the telescopic cylinder 9 cannot be pulled. At this time, the rotary pressing mechanism 11 is in a suitable position to press the cylindrical assembly.

[0053] The rotary clamping mechanism 11 also includes a proximity switch 15 for monitoring the clamping effect. The proximity switch 15 is located on the side of the clamping head 14 and is electrically connected to an external controller. The proximity switch 15 can detect whether there is any metal obstruction within a 10mm range. If there is, it proves that the clamping head 14 has clamped the cylindrical assembly and the clamping is complete.

[0054] The working principle of this invention is as follows: At the start of operation, the output shafts of both the hydraulic cylinder 5 and the telescopic cylinder 9 are in their maximum extended state, that is, located inside the cylindrical assembly.

[0055] When clamping the rice counting cylinder assembly 2, the positioning semicircle 201 is fitted onto one of the positioning pins 18, and the other positioning pin 18 is also inside the cylinder assembly. Then, the hydraulic cylinder 5 is activated, and the hydraulic cylinder 5 pulls the tensioning and limiting mechanism to move to the side where the hydraulic cylinder 5 is located. When it moves to the point where the self-centering tensioning pin 19 abuts against the inner wall of the cylinder assembly, the cylinder assembly and the tensioning and limiting mechanism move together until the other positioning pin 18 abuts against the inner wall of the cylinder assembly. At this point, the centering operation is completed, and the hydraulic cylinder 5 is closed.

[0056] Next, the rotary clamping cylinder 12 located around the tooling platform 1 is activated. The rotary pressing cylinder 12 drives the pressure plate 13 to move downward while rotating 90 degrees. The clamping head 14 fixes and clamps the rolling process allowance 202. The clamping effect is detected by the proximity switch 15. When the proximity switch 15 detects a metal obstruction, the clamping is complete.

[0057] When clamping the millimeter cylindrical assembly 3, the seat ring reducer hole 302 is locked into the positioning pin 16. At this time, both self-centering tension pins 17 are located inside the cylindrical assembly. Then, the hydraulic cylinder 5 is started. The hydraulic cylinder 5 pulls the tensioning limit mechanism to move to the side where the hydraulic cylinder 5 is located. When the inverted triangular structure 8 of the tensioning limit mechanism presses on the cylindrical seat ring 301, it can drive the cylindrical assembly to move together until the inner wall of the cylindrical assembly abuts against both self-centering tension pins 17. At this time, the centering operation is completed, and the hydraulic cylinder 5 is closed.

[0058] Next, the telescopic cylinder 9 is activated. The telescopic shaft of the telescopic cylinder 9 drives the rotary clamping mechanism 11 to approach the inner wall of the cylindrical assembly until the stop post 20 abuts against it. Then the telescopic cylinder 9 stops. The rotary clamping mechanism 11 is then activated. The operation of the rotary clamping mechanism 11 is the same as the operation of the large-meter cylindrical assembly 2. At this time, the clamping head 14 completes the fixed clamping of the cylindrical seat ring 301. After detection by the proximity switch 15, the clamping operation is completed.

[0059] After the clamping operation is completed, the lower part of the tooling platform 1 is connected to the slewing bearing of the positioner 4. The positioner 4 drives the tooling platform 1 and the cylindrical assembly to flip and rotate together, and cooperates with the machine to perform welding operations.

[0060] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An automated clamping device for welding cylindrical components of concrete pump trucks, the cylindrical components comprising large-diameter cylindrical components and medium-diameter cylindrical components, characterized in that: The tooling platform includes hydraulic cylinders and multiple telescopic cylinders. The output shaft of the hydraulic cylinder is connected to the tensioning and limiting mechanism. The hydraulic cylinder can drive the tensioning and limiting mechanism and the cylindrical assembly to move closer to or away from the center of the tooling platform until the center of the cylindrical assembly coincides with the center of the tooling platform. The telescopic cylinders are all connected to the rotary clamping mechanism for fixing the millet counting cylinder assembly. The telescopic cylinders can drive the rotary clamping mechanism to move closer to or away from the large rice counting cylinder assembly. The tooling platform is also equipped with a rotary clamping mechanism for fixing the large rice counting cylinder assembly. The tooling platform is connected to the slewing bearing of the positioner below. The positioner can drive the tooling platform and the cylindrical assembly to flip and rotate together to cooperate with the machine for welding operations. The bottom plate of the rice counting cylinder assembly is provided with a positioning semicircle, and the tooling platform is provided with a positioning pin two that is adapted to the positioning semicircle. The number of positioning pin two is two, and they are arranged symmetrically. The positioning semicircle is fitted onto one of the positioning pin two. The lower periphery of the millimeter cylindrical component is provided with a cylindrical seat ring for clamping. The cylindrical seat ring is provided with a seat ring reducer hole. The tooling platform is provided with a positioning pin for positioning the seat ring reducer hole. The positioning pin is symmetrically arranged on both sides of the oil cylinder. The tooling platform is symmetrically provided with self-centering tension pins. During the tensioning process, the self-centering tension pins limit the movement of the small millimeter cylindrical component, so that the center of the small millimeter cylindrical component coincides with the center of the tooling platform.

2. The automated clamping device for welding cylindrical components of concrete pump trucks according to claim 1, characterized in that: The rice-counting cylindrical assembly and the rotating pressing mechanism around the tooling platform are provided with a rolling process allowance.

3. The automated clamping device for welding cylindrical components of concrete pump trucks according to claim 1, characterized in that: The rotary pressing mechanism includes a mounting base, a rotary pressing cylinder, a pressure plate, and a pressing head. The rotary pressing cylinder is located above the mounting base, the pressure plate is sleeved on the output shaft of the rotary pressing cylinder, and the pressing head is located at the end of the pressure plate.

4. An automated clamping device for welding cylindrical components of concrete pump trucks according to claim 3, characterized in that: The mounting base of the rotary pressing mechanism connected to the telescopic cylinder is also provided with a stop post, which is used to limit the extension and retraction range of the telescopic shaft.

5. An automated clamping device for welding cylindrical components of concrete pump trucks according to claim 3, characterized in that: It also includes a proximity switch for monitoring the clamping effect, the proximity switch being located on the side of the clamping head and electrically connected to an external controller.

6. An automated clamping device for welding cylindrical components of concrete pump trucks according to claim 1, characterized in that: The tensioning and limiting mechanism includes a support and a tensioning and limiting block. The tensioning and limiting block is located at the end of the support. The support is connected to the output shaft of the hydraulic cylinder. The support is also provided with a self-centering tensioning pin II, which abuts against the inner wall of the large-meter cylindrical assembly during the tensioning process.

7. An automated clamping device for welding cylindrical components of concrete pump trucks according to claim 6, characterized in that: The tensioning limit block is provided with an inverted triangular structure, which is used to fix the cylindrical seat ring of the millimeter cylindrical assembly during the tensioning process.

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