Air conditioner pipe and rubber pipe riveting machine

Abstract

This invention relates to the field of hose riveting equipment technology, specifically to an air conditioning hose riveting machine, comprising a frame, a hydraulic drive system, a crimping machine, and a controller. The equipment operates in two core modes: In the first mode, the controller, based on feedback from a pressure sensor, precisely controls the crimping machine to close the mold and press the hose, ensuring the actual crimping curve closely approximates the desired standard; in the second mode, the controller switches the oil circuit, supplying oil to the reservoir of the pulling mechanism, driving the telescopic clamp to axially pull the hose, and detecting the displacement using a pull-out displacement sensor. If the displacement exceeds a threshold, the product is deemed unqualified. This invention, through a set of precise crimping and automatic pull-out testing functions, achieves closed-loop quality control of the crimping process and 100% online non-destructive testing of the product's connection strength, fundamentally ensuring the reliability and sealing of air conditioning pipe connections, and significantly improving production automation and quality.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rubber pipe riveting equipment, in particular to an air conditioner pipe rubber pipe riveting machine. BACKGROUND

[0002] In the assembly and production of air conditioner refrigeration pipelines, firmly and sealingly crimping a metal sleeve on the end of a rubber pipe is a key process. The currently widely used hydraulic or pneumatic pipe crimping equipment mainly focuses on completing the basic buckling operation, and generally lacks accurate monitoring and closed-loop control of the core parameters of the crimping process. This makes the crimping quality largely dependent on the stability of the equipment itself and the experience of the operator, and it is difficult to avoid defects such as insufficient crimping or overpressure damage caused by mold wear, hydraulic fluctuations or material batch differences. More importantly, the existing technology cannot immediately perform rapid, objective and non-destructive detection on the connection strength of the finished product after crimping. Quality verification usually relies on subsequent air tightness tests or destructive sampling, which not only is inefficient and increases production costs, but also risks missing quality problems.

[0003] Therefore, it is necessary to develop an air conditioner pipe rubber pipe riveting machine to solve the above problems. SUMMARY

[0004] This section aims to summarize some aspects of the embodiments of the present application and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of the specification to avoid obscuring the purpose of this section, abstract and title, and such simplifications or omissions cannot be used to limit the scope of the present application.

[0005] An air conditioner pipe rubber pipe riveting machine, comprising a rack, a hydraulic drive system, a buckling machine and a controller, the hydraulic drive system comprising a cylinder and a pressure sensor, the pressure sensor being used to monitor the buckling pressure of the buckling machine in real time, further comprising a rubber pipe pulling mechanism, the rubber pipe pulling mechanism comprising a telescopic clamp plate, the telescopic clamp plate being used to clamp the rubber pipe body, the telescopic clamp plate being slidingly connected inside a liquid storage chamber, a pulling displacement sensor being fixedly connected to the bottom of the liquid storage chamber for monitoring the movement distance of the telescopic clamp plate, the controller having a standard crimping pressure-displacement curve and a maximum allowable displacement threshold value pre-stored therein; the controller is configured to:

[0006] First mode: control the hydraulic drive system to drive the buckling machine to close the mold, crimp the sleeve on the rubber pipe, and based on the feedback of the pressure sensor, make the actual crimping pressure curve approach the standard crimping pressure-displacement curve pre-stored in the controller;

[0007] The second mode: after the crimping action is completed, the hydraulic drive system is controlled to fill the liquid oil into the liquid storage chamber, and then the telescopic clamp plate pulls the rubber tube to apply tension, and the drawing displacement sensor detects that the displacement of the rubber tube exceeds the maximum allowable displacement threshold, and it is determined that the product is unqualified.

[0008] Preferably, the crimping machine is fixedly installed on a rack, the oil cylinder is fixedly connected to the side wall of the rack, the oil cylinder is communicated with a multi-connection hydraulic valve through a pipeline, the multi-connection hydraulic valve is divided into a crimping oil path and a drawing oil path, the crimping oil path is communicated with the crimping machine, the crimping oil path is fixedly connected with the pressure sensor for monitoring the crimping pressure of the crimping machine in real time, and the drawing oil path is communicated with a plurality of liquid storage chambers through an annular connecting pipe.

[0009] Preferably, the liquid storage chamber is fixedly connected to the movable die in the crimping machine, the telescopic clamp plate is slidably connected in the liquid storage chamber, the telescopic clamp plate clamps the rubber tube through the head-connection fitting structure, and the bottom of the liquid storage chamber is fixedly connected with the drawing displacement sensor for detecting the displacement of the rubber tube clamped by the telescopic clamp plate relative to the crimping machine.

[0010] Preferably, the fitting structure comprises an abutting block, the lower end of the abutting block is arc-shaped and matched with the rubber tube, and the upper end of the abutting block is fixedly connected with a sliding column, and the sliding column is movably connected to the end of the telescopic clamp plate through a spring; in the initial state, the abutting block is closer to the rubber tube relative to the movable die in the crimping machine.

[0011] Preferably, the hydraulic drive system further comprises a crimping displacement sensor for detecting the displacement of the piston rod of the oil cylinder; the crimping displacement sensor is fixedly connected to the oil cylinder, and the standard crimping pressure-displacement curve and the actual crimping pressure-displacement curve pre-stored in the controller are both based on the displacement detected by the crimping displacement sensor.

[0012] Preferably, the controller further pre-stores a pressure tolerance threshold and a displacement tolerance threshold; the controller is configured to: in the first mode, calculate the pressure difference value of the actual pressure and the standard pressure at the same displacement point, or calculate the displacement difference value of the actual displacement and the standard displacement at the same pressure point; when the pressure difference value continuously exceeds the pressure tolerance threshold or the displacement difference value continuously exceeds the displacement tolerance threshold, it is determined that an abnormality occurs.

[0013] Preferably, the controller is further connected with an audible and light alarm; the controller is configured to control the audible and light alarm to give an alarm and interrupt the current operation when the deviation of the actual crimping pressure-displacement curve from the standard crimping pressure-displacement curve exceeds a preset tolerance in the first mode or when it is determined that the pull-off resistance test is unqualified in the second mode.

[0014] Preferably, the device further comprises a support structure, which comprises a sliding base connected with the rack through a sliding groove, and an upper end surface of the sliding base is fixedly connected with a support frame for supporting the rubber tube.

[0015] Preferably, the device further comprises a tight and anti-drop unit, which comprises a contraction cylinder fixedly connected with a side fixed surface of the crimping machine, a baffle slidably connected in the contraction cylinder, a lower end of the baffle fixedly connected with a liquid storage chamber through a pull rod, and the liquid storage chamber and the contraction cylinder are communicated through a suction pipe.

[0016] The beneficial effects of the present application are as follows:

[0017] The device can effectively prevent quality problems such as insufficient pressure, overpressure and abnormal crimping stroke from the source, and ensure the high consistency and reliability of the crimping process.

[0018] The device automatically switches to the test mode after crimping by using the same hydraulic system and driving structure, applies a quantitative axial tension to the crimping point and monitors the displacement, thereby realizing 100% online and non-destructive detection of the connection strength of each product, and completely replacing the traditional inefficient and destructive sampling inspection method.

[0019] The tight and anti-drop unit in the device ensures that the rubber tube is in the center position of the sleeve before crimping, eliminates the assembly gap, effectively prevents quality problems such as crimping eccentricity or incompletion caused by the skew or misplacement of the rubber tube, and offsets the possible outward creep of the rubber tube during crimping, further ensuring the uniformity and reliability of the crimping. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0021] Wherein:

[0022] Figure 1 Fig. 1 is a schematic diagram of the overall structure of the present application;

[0023] Figure 2 Fig. 2 is an enlarged schematic diagram of A in Fig. 1; Figure 1

[0024] Figure 3 Fig. 3 is a schematic diagram of the structure of the pressing machine;

[0025] Figure 4 Fig. 4 is an enlarged schematic diagram of B in Fig. 1; Figure 3

[0026] Figure 5 Fig. 5 is a schematic diagram of the structure of the pressing machine, the rubber tube and the sleeve;

[0027] Figure 6 Fig. 6 is a schematic diagram of the structure of the abutting anti-escape unit;

[0028] Figure 7 Fig. 7 is an enlarged schematic diagram of C in Fig. 1; Figure 6

[0029] Figure 8 Fig. 8 is a schematic diagram of the structure of the rubber tube pulling mechanism;

[0030] Figure 9 Fig. 9 is an enlarged schematic diagram of D in Fig. 1; Figure 8 Fig. 10 is a schematic diagram of the structure of the rubber tube pulling mechanism;

[0031]

[0032] 1, frame; 2, pressing machine;

[0033] 3, support structure; 31, sliding base; 32, sliding groove; 33, support frame;

[0034] 4, abutting anti-escape unit; 41, contraction cylinder; 42, pull rod; 43, baffle; 44, suction pipe;

[0035] 7, hydraulic drive system; 71, oil cylinder; 72, pressure sensor; 73, pressure contact oil circuit; 74, multi-connection hydraulic valve; 75, pressure contact displacement sensor;

[0036] 8, controller; 81, audible and visual alarm;

[0037] 9, rubber tube pulling mechanism; 91, pulling oil circuit; 92, telescopic clamping plate; 93, liquid storage chamber; 94, annular connecting pipe; 95, pulling displacement sensor; 96, fitting structure; 961, abutting block; 962, sliding column; 963, spring;

[0038] 100, rubber tube; 200, sleeve. DETAILED DESCRIPTION

[0039] ​​​​To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0040] The air conditioning hose riveting machine operates in two core modes: Mode 1 (precision crimping) and Mode 2 (pull-out test). The operator places two rubber hoses 100, each fitted with a sleeve 200, into the crimping machine 2 and starts the equipment. The controller 8 first executes Mode 1, controlling the crimping machine 2 to complete the crimping with the optimal pressure-displacement curve. Subsequently, the equipment automatically switches to Mode 2, applying axial tension to the rubber hoses 100 via the hose pulling mechanism 9 to test the firmness of the crimped joint. The entire process is monitored by the controller 8, which immediately alarms upon detecting any abnormality.

[0041] Example: Figures 1-9 As shown, an air conditioning hose riveting machine includes a frame 1, a hydraulic drive system 7, a crimping machine 2, and a controller 8. The hydraulic drive system 7 includes a cylinder 71 and a pressure sensor 72. The pressure sensor 72 is used to monitor the crimping pressure of the crimping machine 2 in real time. It also includes a hose pulling mechanism 9, which includes a telescopic clamping plate 92 for clamping the hose body 100. The telescopic clamping plate 92 is slidably connected inside a liquid storage chamber 93. A pull-out displacement sensor 95 is fixedly connected to the bottom of the liquid storage chamber 93 to monitor the movement distance of the telescopic clamping plate 92. The controller 8 has a pre-stored standard crimping pressure-displacement curve and a maximum allowable displacement threshold. The controller 8 is configured to:

[0042] First mode: Control the hydraulic drive system 7 to drive the crimping machine 2 to close the mold, crimp the sleeve 200 on the rubber tube 100, and based on the feedback of the pressure sensor 72, make the actual crimping pressure curve approximate the standard crimping pressure-displacement curve pre-stored in the controller 8.

[0043] Second mode: After the crimping action is completed, the hydraulic drive system 7 is controlled to fill the liquid oil into the liquid storage chamber 93. Then the telescopic clamp 92 pulls the rubber tube 100 to apply axial tension. The pull displacement sensor 95 detects that the displacement of the rubber tube 100 exceeds the maximum allowable displacement threshold, and determines that the product is unqualified.

[0044] The pressing machine 2 is fixedly installed on the frame 1, the oil cylinder 71 is fixedly connected to the side wall of the frame 1, the oil cylinder 71 is communicated through a pipeline and a multi-connection hydraulic valve 74, the multi-connection hydraulic valve 74 is divided into a crimping oil path 73 and a drawing oil path 91, the crimping oil path 73 is communicated with the pressing machine 2, the crimping oil path 73 is fixedly connected with the pressure sensor 72 for monitoring the crimping pressure of the pressing machine 2 in real time, and the drawing oil path 91 is communicated with a plurality of liquid storage chambers 93 through an annular connecting pipe 94.

[0045] The liquid storage chamber 93 is fixedly connected to the movable die in the pressing machine 2, the telescopic clamping plate 92 is slidably connected in the liquid storage chamber 93, the telescopic clamping plate 92 clamps the rubber tube 100 through the head-connected fitting structure 96, and the bottom of the liquid storage chamber 93 is fixedly connected with the drawing displacement sensor 95 for detecting the displacement of the rubber tube 100 relative to the pressing machine 2 clamped by the telescopic clamping plate 92.

[0046] The annular connecting pipe 94 and the suction pipe 44 are both collapsible pipes.

[0047] The multi-connection hydraulic valve 74 of the hydraulic drive system 7 receives the instruction of the controller 8. In the first mode, the multi-connection hydraulic valve 74 delivers the pressure oil to the pressing machine 2 through the crimping oil path 73, drives the movable die to close, and completes the crimping. The pressure sensor 72 on the crimping oil path 73 monitors the pressure in real time and feeds back to the controller 8. When crimping, since the abutting block 961 is closer to the rubber tube 100 relative to the movable die in the pressing machine 2, the fitting structure 96 has contacted the rubber tube 100 before the movable die contacts the sleeve 200 outside the rubber tube 100, after the crimping is completed, the controller 8 switches the multi-connection hydraulic valve 74, and delivers the pressure oil to the liquid storage chamber 93 fixed to the movable die through the drawing oil path 91 and the annular connecting pipe 94. The oil pressure pushes the telescopic clamping plate 92 in the liquid storage chamber 93 to extend outward, at this time, the fitting structure 96 at the end tightly clamps the rubber tube 100. Then, the controller 8 controls the hydraulic system to continuously pressurize the liquid storage chamber 93, and the telescopic clamping plate 92 moves axially with the rubber tube 100 relative to the sleeve 200 fixed by the die of the pressing machine 2 under the action of the oil pressure. The drawing displacement sensor 95 monitors the displacement in real time.

[0048] Further, the fitting structure 96 comprises an abutting block 961, the lower end of the abutting block 961 is arc-shaped and matched with the rubber tube 100, the upper end of the abutting block 961 is fixedly connected with a sliding column 962, and the sliding column 962 is movably connected to the end of the telescopic clamp plate 92 through a spring 963; in the initial state, the abutting block 961 is closer to the rubber tube 100 relative to the movable mold in the crimping machine 2; when the movable mold of the crimping machine 2 starts to close but has not yet been crimped to the sleeve 200, the abutting block 961 of the fitting structure 96 will first contact and abut against the rubber tube 100. With the mold continuing to advance, the sliding column 962 is retracted into the telescopic clamp plate 92 against the force of the spring 963. At the same time, the pull rod 42 fixedly connected to the liquid storage chamber 93 pulls the baffle 43 of the abutting anti-disengagement unit 4 to move in the contraction cylinder 41, and the hydraulic oil is extracted from the liquid storage chamber 93 through the suction pipe 44 (the multi-connection hydraulic valve 74 plays a regulating role), so that the telescopic clamp plate 92 generates a contraction action. This action is transmitted to the left and right rubber tubes 100 through the abutting block 961, so that the end portions of the rubber tubes 100 generate a pre-tightening force in the opposite direction before crimping, and are tightly attached to the inside of the sleeve 200. Then the movable mold contacts the sleeve 200, and the two rubber tubes 100 subjected to the pre-tightening force are crimped and formed, effectively preventing the rubber tube 100 from disengaging from the sleeve 200 during the crimping action, and improving the crimping effect.

[0049] It should be understood that the above process ensures that the rubber tube 100 is in the center position of the sleeve 200 before crimping, eliminates the assembly gap, and effectively prevents quality problems such as crimping eccentricity or incomplete crimping caused by the rubber tube being skewed or not in place. At the same time, the pre-tightening force can offset the possible outward creep of the rubber tube 100 during the crimping process, further ensuring the uniformity and reliability of the crimping.

[0050] Further, the hydraulic drive system 7 further comprises a crimping displacement sensor 75 for detecting the displacement of the piston rod of the oil cylinder 71; the crimping displacement sensor 75 is fixedly connected to the oil cylinder 71, and the standard crimping pressure-displacement curve and the actual crimping pressure-displacement curve pre-stored in the controller 8 are both based on the displacement detected by the crimping displacement sensor 75;

[0051] The controller 8 further pre-stores a pressure tolerance threshold and a displacement tolerance threshold; the controller 8 is configured to: in the first mode, calculate the pressure difference value of the actual pressure and the standard pressure at the same displacement point, or calculate the displacement difference value of the actual displacement and the standard displacement at the same pressure point in real time; when the pressure difference value continuously exceeds the pressure tolerance threshold or the displacement difference value continuously exceeds the displacement tolerance threshold, it is determined as an abnormality.

[0052] The controller 8 is also connected with an audible and light alarm 81; the controller 8 is configured to: in the first mode, when the deviation of the actual crimping pressure-displacement curve from the standard crimping pressure-displacement curve exceeds the preset tolerance; or in the second mode, when it is determined that the pull-off resistance test is unqualified, control the audible and light alarm 81 to issue an alarm and interrupt the current operation.

[0053] In the first mode, the crimping displacement sensor 75 fixed on the oil cylinder 71 detects the stroke of the piston rod in real time, and the pressure sensor 72 detects the oil pressure in real time. The controller 8 converts the oil pressure into actual crimping force according to the oil cylinder piston area, and draws a real-time crimping force-displacement curve with the data of the crimping displacement sensor 75 as the abscissa. The controller 8 compares it with the pre-stored standard curve. If the difference between the actual pressure and the standard pressure at any same displacement point continuously exceeds the pressure tolerance threshold, or the displacement difference at the same pressure point exceeds the displacement tolerance threshold, the controller 8 determines that the crimping process is abnormal, and immediately controls the audible and light alarm 81 to alarm and interrupt the crimping process. In the second mode, if the displacement monitored by the pull-off displacement sensor 95 exceeds the maximum allowable displacement threshold, the controller 8 determines that the pull-off resistance of the product is unqualified, and also triggers the audible and light alarm 81 to alarm.

[0054] It should be understood that the abnormality of pressure or displacement is often an early sign of mold wear, hydraulic system failure, or unqualified incoming materials. This function can realize predictive maintenance and find problems before causing a large number of waste products;

[0055] The second mode realizes online pull-off resistance testing for each crimping point, replacing the traditional destructive sampling inspection, which not only ensures full inspection but also saves cost.

[0056] Further, it further includes a support structure 3, the support structure 3 includes a sliding base 31, the sliding base 31 is slidably connected on the rack 1 through a sliding groove 32, and the upper end surface of the sliding base 31 is fixedly connected with a support frame 33 for supporting the rubber tube 100;

[0057] It further includes a tight anti-off unit 4, the tight anti-off unit 4 includes a contraction cylinder 41, the contraction cylinder 41 is fixedly connected on the side fixed surface of the crimping machine 2, a baffle 43 is slidably connected in the contraction cylinder 41, the lower end of the baffle 43 is fixedly connected with the liquid storage chamber 93 through a pull rod 42, and the liquid storage chamber 93 and the contraction cylinder 41 are communicated through a suction pipe 44.

[0058] The sliding base 31 of the support structure 3 can move along the sliding groove 32 on the rack 1, so as to adjust the support frame 33 to a suitable support position of the rubber tube 100, preventing the long rubber tube from affecting assembly and testing due to self-weight sagging.

[0059] In the initial stage when the movable die of the crimping machine 2 starts to close but has not yet contacted the sleeve 200 for crimping, it is a critical time window. At this time, the liquid storage chamber 93 fixed on the movable die starts to move forward with the die.

[0060] Pre-contact and positioning: Since the abutting block 961 of the fitting structure 96 is more protruding relative to the die end face in the initial state, it will contact the pipe body of the left and right rubber tubes 100 before the die. This "pre-contact" action physically completes the preliminary centering and axial positioning of the rubber tubes 100, ensuring that they are on the axis of the sleeve 200.

[0061] Linkage triggering and pre-tightening: As the movable die continues to advance, the abutting block 961 is pressed against the rubber tube, causing the sliding column 962 to overcome the force of the spring 963 and start to shrink inside the telescopic clamp plate 92. Almost at the same time, as the liquid storage chamber 93 continues to advance, the pull rod 42 fixedly connected thereto starts to pull the baffle 43 inside the abutting anti-displacement unit 4, causing it to slide inward in the contraction cylinder 41.

[0062] Generating suction force: The movement of the baffle 43 causes the volume inside the contraction cylinder 41 that was originally closed by it to increase, forming a negative pressure (vacuum effect). This negative pressure is transmitted through the suction pipe 44 to the cavity of the liquid storage chamber 93 connected thereto.

[0063] Performing pre-tightening action: The negative pressure in the liquid storage chamber 93 acts on the back of the telescopic clamp plate 92, generating a suction force that drives the telescopic clamp plate 92 to slide back with the abutting block 961. This contraction action is converted into an axial pulling force on the left and right rubber tubes 100 through the abutting block 961 that has been tightly attached to the rubber tube, causing their end portions to approach each other and tightly fit on the inner wall of the sleeve 200. All assembly gaps are eliminated in advance. The pressure of the die is fully used for plastic deformation of the sleeve 200 from the first moment, ensuring that the crimping process is highly consistent with the preset "pressure-displacement curve", and fundamentally ensuring the sufficiency and stability of the crimping force.

[0064] The working process is as follows:

[0065] The operator inserts the end portions of the two rubber tubes 100 into the metal sleeve 200 and places the assembly in the die cavity of the crimping machine 2. After starting the device, the controller 8 starts to execute the first mode, i.e. the precise crimping process.

[0066] The controller 8 first instructs the multi-connection hydraulic valve 74 of the hydraulic drive system 7 to deliver pressure oil to the crimping machine 2 through the crimping oil path 73, driving the movable mold to start moving towards the fixed mold to perform mold closing. At this initial stage of mold closing, a key preparatory action occurs: the liquid storage chamber 93 fixedly connected to the movable mold moves forward, so that the abutting block 961 of the fitting structure 96 installed at the front end of the liquid storage chamber 93 contacts and abuts against the pipe body of the rubber tube 100 first. As the movable mold continues to move forward, the abutting block 961 is blocked by the rubber tube 100, causing the sliding column 962 to retract inward against the force of the spring 963. At the same time, the pull rod 42 fixed to the liquid storage chamber 93 starts to pull the baffle 43 of the abutting anti-displacement unit 4 to move within the retracting cylinder 41, which generates negative pressure within the retracting cylinder 41 and is transmitted to the cavity of the liquid storage chamber 93 through the suction pipe 44. The negative pressure causes the telescopic clamp plate 92 to produce a retraction displacement, which is converted into an axial tension on the left and right rubber tubes 100 through the abutting block 961, causing the ends of the rubber tubes 100 to be tightly clamped on the inner wall of the sleeve 200, completing automatic centering and pre-tightening.

[0067] After that, the movable mold formally contacts and starts to extrude the sleeve 200, and the crimping process is fully developed. During this process, the crimping displacement sensor 75 fixedly connected to the oil cylinder 71 detects the stroke displacement of the piston rod in real time, and at the same time, the pressure sensor 72 installed on the crimping oil path 73 monitors the system pressure in real time. The controller 8 converts the pressure value into the actual crimping force according to the piston area of the oil cylinder 71. The controller 8 takes the data of the crimping displacement sensor 75 as the abscissa to draw the actual crimping force displacement curve in real time, and compares it with the pre-stored standard crimping force displacement curve. The controller 8 calculates the difference between the actual pressure and the standard pressure at the same displacement point in real time, and if the difference continuously exceeds the pre-stored pressure tolerance threshold, it is determined that the crimping process is abnormal. Once it is determined to be abnormal, the controller 8 immediately controls the sound and light alarm 81 to issue an alarm and interrupts the crimping process. If the whole process is normal, the controller 8 controls the crimping machine 2 to complete the entire crimping stroke, causing the sleeve 200 to produce precise plastic deformation and bite the rubber tube 100, forming a firm and sealed connection.

[0068] After the crimping action is completed, the device automatically switches to the second mode, i.e. the automatic pull-off test process. The controller 8 switches the multi-union hydraulic valve 74 to deliver pressure oil to the storage chamber 93 through the pull-off oil path 91 and the annular connecting pipe 94. The pressure oil pushes the telescopic clamp plate 92 to extend outward, so that the abutting structure 96 at the end tightly clamps the pipe body of the rubber tube 100. Then, the controller 8 controls the hydraulic system to continuously pressurize the storage chamber 93, and the telescopic clamp plate 92 is driven by the oil pressure to move axially with the clamped rubber tube 100 relative to the sleeve 200 fixed by the die of the crimping machine 2, thereby exerting a gradually increasing pulling force on the crimping point (the pulling force will decrease after reaching a preset peak value). The pull-off displacement sensor 95 fixedly installed at the bottom of the storage chamber 93 monitors the displacement of the telescopic clamp plate 92 in real time, i.e. the displacement of the rubber tube 100 relative to the sleeve 200. The controller 8 continuously reads the displacement value, and if the value exceeds the maximum allowable displacement threshold value pre-stored in the controller 8, it indicates that the pull-off strength of the crimping point is insufficient, and the relative sliding between the sleeve 200 and the rubber tube 100 has occurred. The controller 8 immediately determines that the product is unqualified, and immediately controls the sound and light alarm 81 to emit a sound and light signal that is different from the process abnormal alarm, prompting the operator to handle the unqualified product.

[0069] During the entire working process, the sliding base 31 of the support structure 3 can move along the sliding groove 32 on the rack 1, so as to adjust the support frame 33 at its upper end to the appropriate support position of the rubber tube 100, thereby providing stable support for the long pipeline and preventing the pipeline from sagging due to its own weight, which affects the assembly and testing accuracy. Finally, only the products that have successfully passed the first mode precision crimping and the second mode pull-off test are considered as good products and flow into the next process, thereby realizing the integration of production and testing and ensuring the product quality.

[0070] The basic principles, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. An air conditioner pipe and rubber pipe riveting machine, comprising a rack (1), a hydraulic drive system (7), a buckling machine (2) and a controller (8), the hydraulic drive system (7) comprises a cylinder (71) and a pressure sensor (72), the pressure sensor (72) is used for monitoring the buckling pressure of the buckling machine (2) in real time, characterized in that: Further comprising a rubber tube pulling mechanism (9), the rubber tube pulling mechanism (9) comprises a telescopic clamp plate (92) for clamping a rubber tube (100) body, the telescopic clamp plate (92) is slidingly connected inside a liquid storage chamber (93), a pulling displacement sensor (95) is fixedly connected at the bottom of the liquid storage chamber (93) for monitoring the moving distance of the telescopic clamp plate (92), the controller (8) has pre-stored a standard crimping pressure-displacement curve and a maximum allowable displacement threshold value; the controller (8) is configured to: The first mode: control the hydraulic drive system (7) to drive the crimping machine (2) to close the mold, crimp the sleeve (200) sleeved on the rubber tube (100), and based on the feedback of the pressure sensor (72), make the actual crimping pressure curve approach the standard crimping pressure-displacement curve pre-stored in the controller (8); The second mode: after the crimping action is completed, control the hydraulic drive system (7) to fill liquid oil into the liquid storage chamber (93), then the telescopic clamp plate (92) pulls the rubber tube (100) to apply axial tension, and the pulling displacement sensor (95) detects that the displacement of the rubber tube (100) exceeds the maximum allowable displacement threshold value, and determines that the product is unqualified.

2. The air conditioner pipe cementing tube riveting machine according to claim 1, characterized in that: The crimping machine (2) is fixedly installed on the rack (1), the oil cylinder (71) is fixedly connected to the side wall of the rack (1), the oil cylinder (71) is communicated with a plurality of hydraulic valves (74) through pipelines, the plurality of hydraulic valves (74) are divided into a crimping oil path (73) and a pulling oil path (91), the crimping oil path (73) is communicated with the crimping machine (2), and the crimping oil path (73) is fixedly connected with the pressure sensor (72) for monitoring the crimping pressure of the crimping machine (2) in real time, and the pulling oil path (91) is communicated with a plurality of liquid storage chambers (93) through an annular connecting pipe (94).

3. The air conditioner pipe cementing tube riveting machine according to claim 2, characterized in that: The liquid storage chamber (93) is fixedly connected to the movable mold in the crimping machine (2), the telescopic clamp plate (92) is slidingly connected in the liquid storage chamber (93), the telescopic clamp plate (92) clamps the rubber tube (100) through the head-connection fitting structure (96), and the bottom of the liquid storage chamber (93) is fixedly connected with the pulling displacement sensor (95) for detecting the displacement of the rubber tube (100) relative to the crimping machine (2) clamped by the telescopic clamp plate (92).

4. The air conditioner pipe cementing tube riveting machine according to claim 3, characterized in that: The fitting structure (96) comprises an abutting block (961), the lower end of the abutting block (961) is arc-shaped and matched with the rubber tube (100), and the upper end of the abutting block (961) is fixedly connected with a sliding column (962), the sliding column (962) is movably connected to the end of the telescopic clamp plate (92) through a spring (963); in the initial state, the abutting block (961) is closer to the rubber tube (100) relative to the movable mold in the crimping machine (2).

5. The air conditioner pipe cementing and riveting machine according to claim 1, characterized in that: The hydraulic drive system (7) further comprises a pressure contact displacement sensor (75) for detecting the displacement of the piston rod of the oil cylinder (71); the pressure contact displacement sensor (75) is fixedly connected to the oil cylinder (71), and the standard pressure contact pressure-displacement curve and the actual pressure contact pressure-displacement curve pre-stored in the controller (8) are both based on the displacement detected by the pressure contact displacement sensor (75).

6. The air conditioner pipe and hose riveting machine according to claim 1, characterized in that: The controller (8) further pre-stores a pressure tolerance threshold and a displacement tolerance threshold; the controller (8) is configured to: in the first mode, calculate the pressure difference value of the actual pressure and the standard pressure at the same displacement point, or calculate the displacement difference value of the actual displacement and the standard displacement at the same pressure point in real time; when the pressure difference value continuously exceeds the pressure tolerance threshold or the displacement difference value continuously exceeds the displacement tolerance threshold, it is determined that an abnormality occurs.

7. The air conditioner pipe cementing and riveting machine according to claim 6, characterized in that: The controller (8) is further connected with an audible and visual alarm (81); the controller (8) is configured to: in the first mode, when the deviation between the actual pressure contact pressure-displacement curve and the standard pressure contact pressure-displacement curve exceeds the preset tolerance; or in the second mode, when it is determined that the pull-off resistance test is unqualified, control the audible and visual alarm (81) to issue an alarm and interrupt the current operation.

8. The air conditioner pipe cementing and riveting machine according to claim 1, characterized in that: Further comprising a support structure (3), the support structure (3) comprises a sliding base (31) which is slidingly connected to the rack (1) through a sliding groove (32), and an upper end surface of the sliding base (31) is fixedly connected with a support frame (33) for supporting the rubber tube (100).

9. The air conditioner pipe cementing and riveting machine according to claim 1, characterized in that: Further comprising a resistance and anti-extraction unit (4), the resistance and anti-extraction unit (4) comprises a contraction cylinder (41) which is fixedly connected to the side fixed surface of the buckling machine (2), a baffle (43) is slidingly connected in the contraction cylinder (41), a lower end of the baffle (43) is fixedly connected with the liquid storage chamber (93) through a pull rod (42), and the liquid storage chamber (93) and the contraction cylinder (41) are communicated through a suction pipe (44).

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