Automatic clamp system for hose pressure resistance test

Abstract

The invention relates to an automatic clamp system for a hose pressure resistance test. The automatic clamp system comprises a motor, a first transmission mechanism, a reverse transmission mechanism, a second transmission mechanism and a clutch mechanism, wherein the motor, the first transmission mechanism, the reverse transmission mechanism and the second transmission mechanism sequentially transmit power, and the clutch mechanism is arranged between the first transmission mechanism and the reverse transmission mechanism. The method comprises the following steps: acquiring the radius of a hose to be detected and the positions of an upper clamping plate and a lower clamping plate, obtaining the distances between the upper clamping plate and the target centering position of the hose to be detected and between the lower clamping plate and the target centering position of the hose to be detected, judging whether the distances are equal or not, and if so, controlling a clutch mechanism and a motor to work to drive the upper clamping plate and the lower clamping plate to synchronously and oppositely move until clamping; if not, the motor drives the upper clamping plate to move downwards until the distances are equal, then the clutch mechanism and the motor are controlled to work, and the upper clamping plate and the lower clamping plate are driven to move synchronously and oppositely until clamping is achieved. The clamp system is high in automation degree, high in clamping precision, high in adaptability and suitable for pressure resistance tests of various hoses, and the test efficiency and accuracy can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of loading and unloading connecting hoses, and particularly to an automatic fixture system for the pressure resistance test of hoses. Background Art

[0002] Hoses are widely used in industry, mainly for connecting a rigid connection point or in scenarios where it is difficult to make a rigid connection between two connection points, and are also commonly used in occasions where flexure is required to convey various media. In order to ensure their safety and reliability in a high-pressure environment, it is necessary to conduct a pressure resistance test on the hoses to evaluate the bearing capacity of the hoses under different pressures and ensure that there are no ruptures or leaks under the working pressure. During the test process, the hoses are filled with water and pressurized to the test pressure and maintained for a certain period of time to check for deformations, leaks, or other forms of failures in the hoses.

[0003] Chinese Patent (CN 218470406 U) provides a pressure resistance test fixture for hoses adapted to multi-specification flange connections. By providing a U-shaped fixing bracket for initially fixing the hose flange, and a pair of horizontally mirror-symmetrical first U-shaped frame and second U-shaped frame, the first U-shaped frame and the second U-shaped frame are driven to move towards each other by a second linear drive mechanism to fasten and align the hose flange, achieving longitudinal limitation of the hose flange and improving the fastening and alignment effect.

[0004] However, this method has the following problems: 1) It cannot ensure the precise alignment of the hose and the pressurization component after clamping; 2) The process of placing the hose on the fixture and clamping it is too cumbersome and inefficient. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to overcome the defects or deficiencies of the prior art, and provide an automatic fixture system for the pressure resistance test of hoses, including a fixed base, a gantry rotatably connected to the fixed base above the fixed base, a lower clamping plate slidably connected to the fixed base, an upper clamping plate slidably connected to the gantry, and further including a driving module. The driving module includes a motor, a first transmission mechanism, a reverse transmission mechanism, a second transmission mechanism that sequentially perform power transmission, and a clutch mechanism provided between the first transmission mechanism and the reverse transmission mechanism; it further includes a first distance measuring module for detecting the moving distance d1 of the lower clamping plate relative to the lower clamping plate reference zero point O1, and a second distance measuring module for detecting the moving distance d2 of the upper clamping plate relative to the upper clamping plate reference zero point O2; it further includes a controller, and the controller is electrically connected and / or communicatively connected to the motor, the clutch mechanism, the first distance measuring module, and the second distance measuring module. The controller realizes the alignment and clamping control of the hose in the following manner:

[0006] S10: Obtain the radius R of the hose to be measured, the first position S1 of the lower clamping plate relative to the reference zero point O1 of the lower clamping plate, and the second position S2 of the upper clamping plate relative to the reference zero point O2 of the upper clamping plate. Calculate the distances between the first position S1 and the second position S2 and the target centering position S3 of the hose to be measured respectively to obtain the first distance D1 and the second distance D2;

[0007] S20: Determine whether the first distance D1 is equal to the second distance D2:

[0008] If yes, calculate the first difference △D1 between the first distance D1 or the second distance D2 and the radius R, control the clutch mechanism to work, realize the connection between the first transmission mechanism and the reverse transmission mechanism, control the motor to work, realize the power transmission from the motor, the first transmission mechanism, the clutch mechanism, the reverse transmission mechanism, and the second transmission mechanism, drive the upper clamping plate and the lower clamping plate to move towards each other synchronously until the first difference △D1 is equal to 0;

[0009] If not, execute step S30;

[0010] S30: Calculate the second difference △D2 between the second distance D2 and the first distance D1, control the motor to work, realize the power transmission from the motor to the first transmission mechanism, drive the upper clamping plate to move downward until the second difference △D2 is equal to 0, and execute step S20.

[0011] The present invention realizes the precise linear motion of the clamping plate through the motor-driven lead screw transmission, and uses the clutch mechanism to complete the flexible switching of power transmission to realize the opposite movement of the upper clamping plate and the lower clamping plate, and complete the centering and clamping of the hose; it not only improves the clamping accuracy and stability, but also reduces the labor intensity and improves the work efficiency through automatic control. At the same time, it has the characteristics of compact structure and strong applicability, and can be widely used in various scenarios that require precise clamping.

[0012] In one embodiment, the reference zero point O1 of the lower clamping plate is the lower limit position that the lower clamping plate can reach, and the reference zero point O2 of the upper clamping plate is the upper limit position that the upper clamping plate can reach;

[0013] The first position S1 of the lower clamping plate is the position reached after the lower clamping plate moves a distance d1 relative to the reference zero point O1 of the lower clamping plate, and the second position S2 of the upper clamping plate is the position reached after the upper clamping plate moves a distance d2 relative to the reference zero point O2 of the upper clamping plate.

[0014] In one embodiment, it further includes a first pressure sensor disposed on the lower clamping plate and capable of contacting the hose to be measured, and a second pressure sensor disposed on the upper clamping plate and capable of contacting the hose to be measured; the first pressure sensor and the second pressure sensor are respectively used to detect the pressure P1 and the pressure P2 received by the lower clamping plate and the upper clamping plate.

[0015] In one embodiment, it further includes a control method for preventing excessive clamping force during the centering clamping of the hose: obtain the pressure P1 and the pressure P2, and determine whether it satisfies that the pressure P1 is less than or equal to the first pressure threshold P 1-set , and the pressure P2 is less than or equal to the second pressure threshold P 2-set . If not satisfied, control the motor to stop working.

[0016] In one embodiment, the clutch mechanism includes: a clutch mechanism bearing seat, and a cylinder module disposed within the clutch mechanism bearing seat. The cylinder module includes a piston chamber disposed within the clutch mechanism bearing seat, a piston disposed within the piston chamber and slidable therein, a piston rod, and an end cap disposed at one end of the piston chamber; one end of the piston rod is located within the piston chamber and fixedly connected to the piston, and the other end passes through the end cap and extends outside the bearing seat; a first bearing, the outer ring of the first bearing is fixedly connected to the clutch mechanism bearing seat; a second bearing, the outer ring of the second bearing is fixedly connected to the piston rod of the cylinder module; wherein, the axes of the first bearing and the second bearing are on the same straight line.

[0017] In one embodiment, the first transmission mechanism is a ball screw transmission mechanism, including a first screw fixedly connected to the output shaft of the motor, and a first moving block sleeved on the first screw through a plurality of balls and forming a screw pair with the first screw. The first screw penetrates through the gantry and extends into the fixed base, and the first moving block is fixedly connected to the upper clamping plate; the reverse transmission mechanism is a gear transmission mechanism, including a driving shaft, a driving gear sleeved on the driving shaft and fixedly connected thereto, a driven shaft, and a driven gear sleeved on the driven shaft and fixedly connected thereto; the driving gear and the driven gear are externally meshed; the second transmission mechanism is a ball screw transmission mechanism, which includes a second screw and a second moving block sleeved on the second screw through a plurality of balls and forming a screw pair with the second screw; the second screw is fixedly connected to the driven shaft, and the second moving block is fixedly connected to the lower clamping plate; the clutch mechanism is fixedly disposed within the fixed base, and first and second long key grooves are respectively disposed at both ends of the inner ring of the second bearing; the first screw is fixedly connected to the inner ring of the first bearing, and the first screw and the inner ring of the second bearing are key-connected through the first long key groove; the driving shaft and the inner ring of the second bearing are key-connected through the second long key groove.

[0018] In one embodiment, the first screw and the second screw are arranged in the vertical direction, and the second screw and the first screw are respectively arranged on both sides of the reverse transmission mechanism.

[0019] In one embodiment, the first distance measuring module is a wire-pulling type displacement sensor, which includes a hub fixedly arranged on a fixed base, a precision rotary inductor connected to the hub, a wire rope wound around the hub, and a signal processor; one end of the wire rope is fixedly connected to the lower clamping plate, and the other end is fixedly connected to the hub, and the signal processor converts the rotation signal of the precision rotary inductor into an electrical signal for output; the second distance measuring module is also a wire-pulling type displacement sensor, which includes a hub fixedly arranged on the gantry, a precision rotary inductor connected to the hub, a wire rope wound around the hub, and a signal processor; one end of the wire rope is fixedly connected to the upper clamping plate, and the other end is fixedly connected to the hub, and the signal processor converts the rotation signal of the precision rotary inductor into an electrical signal for output.

[0020] In one embodiment, the first lead screw and the second lead screw are arranged in the vertical direction, and the second lead screw and the first lead screw are respectively arranged on both sides of the reverse transmission mechanism.

[0021] In one embodiment, the upper edge of the lower clamping plate and the lower edge of the upper clamping plate are U-shaped or V-shaped.

[0022] For better understanding and implementation, the present invention will be described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of the automatic fixture system of the present invention;

[0024] Figure 2 is a perspective structural diagram of the automatic fixture system of the present invention;

[0025] Figure 3 is a front view of the driving unit of the automatic fixture system of the present invention;

[0026] Figure 4 is a side view of the driving unit of the automatic fixture system of the present invention;

[0027] Figure 5 is a schematic diagram of the cooperation of the clutch mechanism of the automatic fixture system of the present invention;

[0028] Figure 6 is a structural diagram of the clutch mechanism of the automatic fixture system of the present invention;

[0029] Figure 7 is a structural diagram of the seal pressure system of the present invention;

[0030] Figure 8 is a structural diagram of the seal head of the present invention;

[0031] Figure 9 is a schematic diagram of the positions between relevant components of the present invention;

[0032] Figure 10 This is the flow chart of the method for realizing the centering and clamping control of the hose in the present invention. Specific embodiments

[0033] The solution of the present invention will be described in detail below with reference to the accompanying drawings.

[0034] As Figures 1 to 2 shown, an automatic fixture system 200 for the pressure test of a hose according to the present invention includes:

[0035] A fixed base 210;

[0036] And a gantry 220 located above the fixed base 210, the gantry 220 is rotatably connected to the fixed base 210;

[0037] And a lower clamping plate 230 slidably connected to the fixed base 210;

[0038] And an upper clamping plate 240 slidably connected to the gantry 220, the upper clamping plate 240 is located above the lower clamping plate 230;

[0039] And a driving module 250, which is arranged in the gantry 220 and the fixed base 210, and the driving module 250 makes the upper clamping plate 240 and the upper clamping plate 240 move towards each other, so as to realize the centering and clamping of the hose;

[0040] In order to better fit the surface of the workpiece and achieve precise positioning, the upper edge of the lower clamping plate 230 and the lower edge of the upper clamping plate 240 are U-shaped.

[0041] Furthermore, it further includes a locking module 260, which includes a cylinder lock 261 fixedly arranged on the gantry and a lock hole 262 fixedly arranged on the fixed base, and the cylinder lock 261 and the lock hole 262 can cooperate to lock the gantry; furthermore, it further includes a switch button (not shown in the figure) arranged on the gantry, and the switch button is electrically connected or communicatively connected to the cylinder lock 261;

[0042] The working process of the locking module 260: when the switch button is in the closed state, the cylinder lock 261 does not work, and the gantry 220 is in the active state; when the switch button is in the open state, the cylinder lock 261 works and cooperates with the lock hole 262, and the gantry 220 is in the locked state.

[0043] As Figure 3As shown, the driving module 250 includes a motor 251 fixedly arranged in the gantry 220, a first transmission mechanism 252 connected to the motor 251 and arranged in the gantry 220 and the fixed base 210, a clutch mechanism 100 arranged in the fixed base 210 for switching the power transmission between the first transmission mechanism 252 and the reverse transmission mechanism 253, a reverse transmission mechanism 253 arranged in the fixed base 210, and a second transmission mechanism 254 arranged in the fixed base 210.

[0044] The motor 251 is mainly used to output the power for the movement of the first transmission mechanism 252. The specific type thereof is not the invention improvement of this application, so this application does not limit it here.

[0045] As Figure 4 shown, the first transmission mechanism 252 is a ball screw transmission mechanism, including a first screw rod 2521 fixedly connected to the output shaft of the motor 251, and a first moving block 2522 sleeved on the first screw rod 2521 through a number of balls (not shown in the figure) and forming a screw pair with the first screw rod 2521. The first screw rod 2521 penetrates through the gantry 220 and extends into the fixed base 210. The first moving block 2522 is fixedly connected to the upper clamping plate 240;

[0046] Under the action of the motor 251, the first screw rod 2521 rotates. Under the action of the first screw rod 2521, the first moving block 2522 can move linearly along the axial direction of the first screw rod 2521 on the gantry 220, thereby driving the upper clamping plate 240 to also move linearly along the axial direction of the first screw rod 2521.

[0047] In order to enable the upper clamping plate 240 to move relatively in the vertical direction, the first screw rod 2521 is arranged in the vertical direction.

[0048] In some embodiments, the first moving block 2522 and the upper clamping plate 240 can be composed of multiple components spliced together, or can be an integrally formed structure; in this embodiment, the first moving block 2522 and the upper clamping plate 240 are of an integrally formed structure. A through hole is provided on one side of the upper clamping plate 240 and sleeved on the first screw rod 2521.

[0049] To support the first lead screw 2521, the first transmission mechanism 252 further includes a first lead screw bearing group 2523 respectively arranged at two ends of the first lead screw 2521. The first lead screw bearing group 2523 includes a first lead screw bearing unit 2523A and a second lead screw bearing unit (not shown in the figure). The first lead screw bearing unit 2523A is fixedly arranged in the gantry 220 and is used to support one end of the first lead screw 2521 connected to the motor 251. The second lead screw bearing unit is fixedly arranged on the fixed base 210 and is used to support the other end of the first lead screw 2521 away from the end connected to the motor 251.

[0050] Specifically, the first lead screw bearing unit 2523A includes a first lead screw bearing (not shown in the figure) and a corresponding first lead screw bearing seat (not shown in the figure). The inner ring of the first lead screw bearing is fixedly connected to the first lead screw 2521, the outer ring of the first lead screw bearing is fixedly connected to the first lead screw bearing seat, and the first lead screw bearing seat is fixedly connected to the gantry 220. The second lead screw bearing unit includes a second lead screw bearing (not shown in the figure) and a corresponding second lead screw bearing seat (not shown in the figure). The inner ring of the second lead screw bearing is fixedly connected to the first lead screw 2521, the outer ring of the second lead screw bearing is fixedly connected to the second lead screw bearing seat, and the second lead screw bearing seat is fixedly connected to the fixed base 210.

[0051] As Figure 5 shown, the reverse transmission mechanism 253 is a gear transmission mechanism, including a driving shaft 2531, a driving gear 2532 sleeved on and fixedly connected to the driving shaft 2531, a driven shaft 2533, and a driven gear 2534 sleeved on and fixedly connected to the driven shaft 2533. The driving gear 2532 is externally meshed with the driven gear 2534.

[0052] To support the driving shaft 2531, a driving shaft bearing unit 2535 is further included. The driving shaft bearing unit 2535 is fixedly arranged in the fixed base and is used to support one end of the driving shaft 2531 away from the end connected to the second bearing 140.

[0053] Specifically, the driving shaft bearing unit 2535 includes a driving shaft bearing (not shown in the figure) and a driving shaft bearing seat (not shown in the figure). The inner ring of the driving shaft bearing is fixedly connected to one end of the driving shaft 2531 away from the end connected to the second bearing 140. The outer ring of the driving shaft bearing is fixedly connected to the driving shaft bearing seat, and the driving shaft bearing seat is fixedly connected to the fixed base 210.

[0054] To support the driven shaft 2533, a driven shaft bearing unit (not shown in the figure) is further included. The driven shaft bearing unit is fixedly arranged in the fixed base.

[0055] Specifically, the driven shaft bearing unit includes a driven shaft bearing (not shown in the figure) and a driven shaft bearing seat (not shown in the figure); the inner ring of the driven shaft bearing is fixedly connected to the driven shaft 2533; the outer ring of the driven shaft bearing is fixedly connected to the driven shaft bearing seat, and the driven shaft bearing seat is fixedly connected to the fixed base 210.

[0056] To achieve smooth and reliable transmission, the module and pressure angle of the driving gear 2532 and the driven gear 2534 are the same, and the center distance is determined according to relevant design requirements to ensure that there is no interference or excessive clearance during meshing;

[0057] To ensure that the rotational speeds of the driving shaft 2531 and the driven shaft 2533 are the same, the number of teeth of the driving gear 2532 and the driven gear 2534 are equal.

[0058] As Figures 5 to 6 shown, the clutch mechanism 100 includes a clutch mechanism bearing seat 110 fixedly arranged in the fixed base 210, a first bearing 120, a cylinder module 130, and a second bearing 140; the outer ring of the first bearing 120 is fixedly connected to the clutch mechanism bearing seat 110, and its inner ring can be fixedly connected to the first lead screw 2521; the cylinder module 130 is arranged in the clutch mechanism bearing seat 110; the outer ring of the second bearing 140 is connected to the cylinder module 130, and a plurality of key grooves are arranged in its inner ring. The second bearing 140 is key-connected to the first lead screw 2521 and can also be key-connected to the driving shaft 2531 under the action of the cylinder module 130.

[0059] The first bearing 120 is a standard rolling bearing component, which specifically includes an outer ring (not shown in the figure), rolling elements (not shown in the figure), and an inner ring (not shown in the figure). Its outer ring is fixedly connected to the clutch mechanism bearing seat 110, and its inner ring is fixedly connected to the first lead screw 2521; the first bearing 120 is used to support the first lead screw 2521 and reduce the frictional torque during its movement.

[0060] The cylinder module 130 includes a piston chamber 131, a piston 132, a piston rod 133 fixedly connected to the piston 132, and an end cover 134; the piston chamber 131 is arranged in the clutch mechanism bearing seat 110; the piston 132 is arranged in the piston chamber 131 and can slide in the piston chamber 131; the piston rod 133 is fixedly connected to the piston 132 and extends outside the clutch mechanism bearing seat 110. The piston rod 133 makes a linear motion along the axial direction of the first lead screw 2521 under the action of the piston 132; the end cover 134 is arranged at one end of the piston chamber 131, and the piston rod 133 penetrates the end cover 134. The end cover 134 is used to seal the piston chamber 131 and fix the piston rod 133;

[0061] To prevent gas from leaking through the gap between the piston rod 133 and the end cap 134, a seal (not shown in the figure), such as a rubber ring, is also provided on the end cap 134.

[0062] In this embodiment, the second bearing 140 is arranged outside the clutch mechanism bearing seat 110 and is a non-standard rolling bearing part. It specifically includes an outer ring (not shown in the figure), rolling elements (not shown in the figure), and a second bearing inner ring 141. The outer ring is fixedly connected to the piston rod 133. At both ends of the second bearing inner ring 141, a first long keyway 141A and a second long keyway 141B are respectively provided. The first lead screw 2521 is key-connected to the inner ring of the second bearing 140 through the first long keyway 141A, and the drive shaft 2531 is key-connected to the inner ring of the second bearing 140 through the second long keyway 141B.

[0063] The length of the connection between the first lead screw 2521 and the second bearing 140 should satisfy that after the second bearing 140 moves under the action of the cylinder module 130, the first lead screw 2521 is still connected to the second bearing 140. Since the length depends on the relative positions of the clutch mechanism 100 and the drive shaft 2531, in this application, no special limitation is imposed on its specific length.

[0064] Specifically, the axes of the first bearing 120 and the second bearing 140 are on the same straight line.

[0065] To improve the centering accuracy of the first lead screw 2521 and the drive shaft 2531, a plurality of first long keyways 141A and second long keyways 141B are provided. The specific number thereof is determined according to the torques that the first lead screw 2521 and the drive shaft 2531 need to transmit respectively, and no specific limitation is made in this application.

[0066] The working process of the clutch mechanism 100: When the cylinder module 130 is not working, the second bearing 140 is not connected to the driving shaft 2531, and the system is in a shaft-disengaged state at this time. In this state, there is no direct mechanical connection between the first lead screw 2521 and the driving shaft 2531. Therefore, the rotational power of the first lead screw 2521 will not be transmitted to the driving shaft 2531, and the driving shaft 2531 remains stationary. When the cylinder module 130 works, the piston 132 in the piston chamber 131 moves linearly in a certain direction under the action of air pressure. The movement of the piston 132 pushes the second bearing 140 to move in the same direction, so that the second bearing 140 can be key-connected to the driving shaft 2531. At this time, the system is in a shaft-connected state. In this state, a mechanical connection is established between the first lead screw 2521 and the driving shaft 2531 through the second bearing 140, and the rotation of the first lead screw 2521 can be transmitted to the driving shaft 2531 through the second bearing 140 to achieve power transmission. When it is necessary to switch from the shaft-connected state to the shaft-disengaged state, the cylinder module 130 can work in the reverse direction, the piston 132 retracts, thereby driving the second bearing 140 to move in the opposite direction and disengaging it from the driving shaft 2531 to achieve shaft disengagement.

[0067] In some embodiments, the clutch mechanism 100 can be separately provided at the outermost end of the first lead screw 2521 far from the other end connected to the motor 251;

[0068] Specifically, in this embodiment, the clutch mechanism 100 replaces the second lead screw bearing unit and can be used to support the first lead screw 2521 and also to switch the power transmission between the first transmission mechanism 252 and the reverse transmission mechanism 253. The clutch mechanism bearing seat 110 is the second lead screw bearing seat, and the first bearing 120 is the second lead screw bearing.

[0069] As Figure 5 shown, the second transmission mechanism 254 is a ball screw transmission mechanism, which includes a second lead screw 2541 and a second moving block 2542 sleeved on the second lead screw 2541 through a number of balls (not shown in the figure) and forming a screw pair with the second lead screw 2541. The second lead screw 2541 is fixedly connected to the driven shaft 2533, and the second moving block 2542 is fixedly connected to the lower clamping plate 230.

[0070] In some embodiments, the second lead screw 2541 and the driven shaft 2533 can be two separate shafts, and the second lead screw 2541 is fixedly connected to the driven shaft 2533 through a coupling (not shown in the figure). In this embodiment, the second lead screw 2541 and the driven shaft 2533 are one shaft, which is an integrally formed shaft.

[0071] When the driving shaft 2531 rotates, it drives the driving gear 2532 connected thereto to rotate. Since the driving gear 2532 and the driven gear 2534 are in an external meshing relationship, the rotation of the driving gear 2532 will drive the driven gear 2534 to rotate in the opposite direction. The rotation of the driven gear 2534 is further transmitted to the second lead screw 2541 fixedly connected thereto, causing the second lead screw 2541 to rotate accordingly. Driven by the second lead screw 2541, the second moving block 2542 moves linearly along the axial direction of the second lead screw 2541. Since the second moving block 2542 is fixedly connected to the lower clamping plate 230, it will further drive the lower clamping plate 230 to move linearly along the axial direction of the second lead screw 2541 on the fixed base 210.

[0072] Specifically, the second lead screw 2541 and the driven shaft 2533 are arranged in a straight line.

[0073] Specifically, the second lead screw 2541 and the first lead screw 2521 are respectively arranged on both sides of the reverse transmission mechanism 253.

[0074] In some embodiments, the second moving block 2542 and the lower clamping plate 230 can be formed by splicing multiple components or can be an integrally formed structure.

[0075] To support the second lead screw 2541, a second lead screw bearing unit group 2543 is further included, which specifically includes a third lead screw bearing unit 2543A and a fourth lead screw bearing unit 2543B. The third lead screw bearing unit 2543A and the fourth lead screw bearing unit 2543B are fixedly arranged in the fixed base 210. The third lead screw bearing unit 2543A is used to support one end of the second lead screw 2541 connected to the driven gear 2534. The fourth lead screw bearing unit 2543B is used to support the other end of the second lead screw 2541 away from the connection with the driven gear 2534.

[0076] Specifically, the third lead screw bearing unit 2543A includes a third lead screw bearing (not shown in the figure) and a corresponding third lead screw bearing seat (not shown in the figure). The fourth lead screw bearing unit 2543B includes a fourth lead screw bearing (not shown in the figure) and a corresponding fourth lead screw bearing seat (not shown in the figure). A plurality of keys are respectively arranged at both ends of the second lead screw 2541, so as to be key-connected to the inner rings of the third lead screw bearing and the fourth lead screw bearing.

[0077] In order to further simplify the structural volume of the present application, in this embodiment, the driven shaft bearing unit is the third lead screw bearing unit 2543A, which serves to support both the driven shaft 2533 and the second lead screw 2541.

[0078] To enable the first moving block 2522 to move relative to each other in the vertical direction, the second lead screw 2541 is arranged in the vertical direction.

[0079] The driving module 250 causes the upper clamping plate 240 and the upper clamping plate 240 to move towards each other, thus realizing the complete workflow of centering and clamping the hose: The motor 251 starts to work, driving the first lead screw 2521 to rotate in the clockwise direction. Under the action of the first lead screw 2521, the upper clamping plate 240 moves linearly downward along the axial direction of the first lead screw 2521; when the upper clamping plate 240 moves to a certain position, the control system triggers the cylinder module in the clutch mechanism to work; at this time, the second bearing is connected to the driving shaft 2531 under the action of the cylinder module, and the rotation of the first lead screw 2521 can be transmitted to the driving shaft 2531 through the second bearing; the rotation of the driving shaft 2531 drives the driving gear 2532 to rotate in the clockwise direction. Since the driving gear 2532 and the driven gear 2534 are in an external meshing relationship, the driven gear 2534 will rotate in the counterclockwise direction; the counterclockwise rotation of the driven gear 2534 further drives the second lead screw 2541 to also rotate in the counterclockwise direction. Under the action of the second lead screw 2541, the lower clamping plate 230 moves linearly upward along the axial direction of the second lead screw 2541; as the upper clamping plate 240 moves downward and the lower clamping plate 230 moves upward, the two move towards each other, realizing the centering and clamping of the hose and completing the entire clamping process.

[0080] Since the internal structure and dimensions of the automatic fixture system 200 are set during the design, therefore, under the action of the second lead screw 2541, when the lower clamping plate 230 moves linearly upward along the axial direction of the second lead screw 2541, there is an upper limit position for the movement of the lower clamping plate and a lower limit position for the movement of the lower clamping plate Under the action of the first lead screw 2521, when the upper clamping plate 240 moves linearly downward along the axial direction of the first lead screw 2521, there is an upper limit position for the movement of the upper clamping plate and a lower limit position for the movement of the upper clamping plate

[0081] Specifically, in this embodiment, the highest point where the upper clamping plate can contact the hose is selected as the reference point for obtaining the limit position, and the lowest point where the lower clamping plate can contact the hose is selected as the reference point for obtaining the limit position.

[0082] When the upper clamping plate 240 and the lower clamping plate 230 move towards each other, in order to accurately obtain the distances d by which the upper clamping plate 240 and the lower clamping plate 230 move respectively, it further includes a first distance measuring module (not shown in the figure) for detecting the moving distance d1 of the lower clamping plate 230, and a second distance measuring module (not shown in the figure) for detecting the moving distance d2 of the upper clamping plate 240;

[0083] Specifically, the first distance measuring module is a wire-pulling displacement sensor, which includes a hub fixedly arranged on a fixed base, a precision rotation sensor connected to the hub, a wire rope wound around the hub, and a signal processor; one end of the wire rope is fixedly connected to the lower clamping plate 230, and the other end is fixedly connected to the hub. The signal processor converts the rotation signal of the precision rotation sensor into an electrical signal for output, so as to obtain the moving distance of the lower clamping plate 230.

[0084] Similarly, the second distance measuring module is also a wire-pulling displacement sensor.

[0085] An automatic clamping system 200 for a hose pressure resistance test according to the present invention further includes a first pressure sensor (not shown in the figure) disposed at the upper edge of the lower clamping plate 230 that can contact the hose, and a second pressure sensor (not shown in the figure) disposed at the lower edge of the upper clamping plate 240 that can contact the hose.

[0086] Specifically, the first pressure sensor and the second pressure sensor are respectively used to detect the pressure P1 of the lower clamping plate 230 and the pressure P2 of the upper clamping plate 240 after the automatic clamping system 200 completes the centering and clamping of the hose to be tested.

[0087] Please refer to Figure 7 and Figure 8 , there is a sealing and pressure boosting system 300 for cooperating with the automatic clamping system 200 to perform a pressure resistance test on the hose to be tested. The sealing and pressure boosting system 300 is disposed opposite to the automatic clamping system 200, and includes:

[0088] A fixed seat 310,

[0089] and a linear driving mechanism 320 disposed on one side of the fixed seat 310, which includes a hydraulic cylinder 321 and a hydraulic cylinder piston rod 322 connected to the hydraulic cylinder 321; under the action of the hydraulic cylinder 321, the hydraulic cylinder piston rod 322 moves linearly in one direction.

[0090] Specifically, the moving direction of the hydraulic cylinder piston rod 322 is consistent with the axial direction of the hose to be tested after centering and clamping under the action of the automatic clamping system 200.

[0091] And a test medium cavity 330, one end face of which is fixedly connected to the hydraulic cylinder piston rod 322, the other end face is provided with a test medium output port (not shown in the figure), and a test medium input port 332 is provided on its side wall.

[0092] and a sealing head 340, through which a pressurizing through-hole 341 is provided. One end face of the sealing head 340 is fixedly connected to the end face of the test medium cavity 330 where the test medium outlet 331 is provided, and the pressurizing through-hole 341 communicates with the test medium outlet 331; on the other end face of the sealing head 340, a plurality of sealing rings 342 for improving the sealing effect are also provided;

[0093] The working process of the sealing and pressurizing system 300: When the automatic fixture system 200 completes centering and clamping of the hose to be tested, the sealing and pressurizing system 300 starts to work. The hydraulic cylinder 321 drives the sealing head 340 to move along the axial direction of the hose to be tested until the sealing head 340 is in close contact with the flange of the hose to be tested. At this time, the pressurizing through-hole 341 is connected in communication with the hose to be tested; test medium is input into the test medium cavity 330 through the test medium inlet 332, so that the test medium can flow out from the test medium outlet 331 of the test medium cavity 330, and then enter the hose to be tested through the pressurizing through-hole 341;

[0094] In order to achieve the best performance detection, the sealing and pressurizing system 300 further includes a connecting member 350 for fixing the relative position between the automatic fixture system 200. One end of the connecting member 350 is fixedly connected to the fixed seat 310 by a thread, and the other end is fixedly connected to the fixed base 210 by a thread; in some embodiments, the number of the connecting members 350 is not specifically limited. In this embodiment, the number of the connecting members 350 is two; further, the sealing head 340 can move linearly along the connecting member 350 under the action of the linear driving mechanism 320; in some embodiments, the sealing head 340 can be fixedly connected to a component (not shown in the figure) sleeved on the connecting member 350; in this embodiment, the sealing head 340 is an integrally formed part and is directly sleeved on the connecting member 350.

[0095] Since the internal structure and dimensions of the sealing and pressurizing system 300 have been set at the initial design stage, the relative position between the sealing and pressurizing system 300 and the automatic fixture system 200 has been determined. Specifically, the relative position between the pressurizing through-hole 341 and the automatic fixture system 200 has also been determined. Specifically, as Figure 9 shown, the lower limit position of the movement of the lower clamping plate and the upper limit position of the movement of the upper clamping plate have been determined. Further, the distance L1 between the lower limit position of the movement of the lower clamping plate and the center of the pressurizing through-hole, and the distance L2 between the upper limit position of the movement of the upper clamping plate and the center of the pressurizing through-hole have been determined.

[0096] Therefore, the lower limit position of the movement of the lower clamping plate is set as the lower clamping plate reference zero point O1, and the upper limit position of the movement of the upper clamping plate is set as the upper clamping plate reference zero point O2.

[0097] Further, the first position P1 of the lower clamping plate is set as the position reached after the lower clamping plate moves a distance d1 relative to the lower clamping plate reference zero point O1, and the second position P2 of the upper clamping plate is set as the position reached after the upper clamping plate moves a distance d2 relative to the upper clamping plate reference zero point O2.

[0098] Further, the center of the pressure through-hole can also be expressed as the target centering position of the hose to be tested.

[0099] Therefore, the first distance D1 between the first position P1 of the lower clamping plate and the target centering position of the hose to be tested can be calculated by the moving distance d1 and the distance L1 between the lower limit position of the movement of the lower clamping plate and the target centering position of the hose to be tested; the second distance D2 between the second position P2 of the upper clamping plate and the target centering position of the hose to be tested can be calculated by the moving distance d2 and the distance L2 between the upper limit position of the movement of the upper clamping plate and the target centering position of the hose to be tested.

[0100] In summary, as shown in Table 1, the determined information of this system is as follows:

[0101]

[0102] As Figure 10 shown, an automatic clamping system 200 for hose pressure resistance test of the present invention further includes a controller (not shown in the figure), and the controller is electrically connected or communicatively connected to the motor 251, the clutch mechanism 100, the first distance measuring module, and the second distance measuring module. The controller realizes the centering and clamping control of the hose in the following manner:

[0103] S10: Obtain the radius R of the hose to be tested, the first position S1 of the lower clamping plate relative to the lower clamping plate reference zero point O1, and the second position S2 of the upper clamping plate relative to the upper clamping plate reference zero point O2, calculate the distances between the first position S1 and the second position S2 and the target centering position S3 of the hose to be tested respectively, and obtain the first distance D1 and the second distance D2;

[0104] S20: Judge whether the first distance D1 is equal to the second distance D2:

[0105] If so, calculate the first difference △D1 between the first distance D1 or the second distance D2 and the radius R, control the clutch mechanism to work, realize the connection between the first transmission mechanism and the reverse transmission mechanism, control the motor to work, realize the power transmission between the motor, the first transmission mechanism, the clutch mechanism, the reverse transmission mechanism, and the second transmission mechanism, and drive the upper clamping plate and the lower clamping plate to move synchronously towards each other until the first difference △D is equal to 0;

[0106] If not, execute step S30;

[0107] S30: Calculate the second difference ΔD2 between the second spacing D2 and the first spacing D1, control the motor to operate, realize the power transmission from the motor to the first transmission mechanism, drive the upper clamping plate to move downward until the second difference ΔD2 is equal to 0, and execute step S20.

[0108] Furthermore, it also includes a control method for preventing excessive clamping force during the centering clamping of the hose:

[0109] Continuously obtain the pressures P1 and P2, and determine whether it satisfies that the pressure P1 is less than or equal to the first pressure threshold P 1-set , and the pressure P2 is less than or equal to the second pressure threshold P 2-set . If not satisfied, control the motor to stop operating.

[0110] The present invention realizes the precise linear motion of the clamping plate through the motor-driven lead screw transmission, and uses the cylinder module to control the clutch mechanism to complete the flexible switching of power transmission, combines the gear transmission to achieve precise power conversion and direction control, and finally realizes the opposite movement of the upper clamping plate and the lower clamping plate to complete the centering clamping of the hose; not only improves the clamping accuracy and stability, but also reduces the labor intensity and improves the work efficiency through automatic control. At the same time, it has the characteristics of compact structure and strong applicability, and can be widely applied to various scenarios that require precise clamping.

[0111] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the embodiments of the present application. The singular forms "a", "the", and "said" used in the embodiments of the present application and the claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that unless otherwise stated, "a plurality" means two or more; the terms "first", "second", "third", etc. are only used for distinction and not for describing a specific order or sequence, nor can they be understood as indicating or implying relative importance. The term "and / or" used herein means and includes any or all possible combinations of one or more of the associated listed items. When the above description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. In the description of the present application, for those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0112] The above-described embodiments only express several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. An automatic fixture system for the pressure resistance test of a hose, comprising a fixed base, a gantry rotatably connected to the fixed base above the fixed base, a lower clamping plate slidably connected to the fixed base, and an upper clamping plate slidably connected to the gantry, characterized in that, It further includes a driving module, which includes a motor, a first transmission mechanism, a reverse transmission mechanism, a second transmission mechanism for power transmission in sequence, and a clutch mechanism arranged between the first transmission mechanism and the reverse transmission mechanism; it further includes a first distance measurement module for detecting the moving distance d1 of the lower clamping plate relative to the lower clamping plate reference zero point O1, and a second distance measurement module for detecting the moving distance d2 of the upper clamping plate relative to the upper clamping plate reference zero point O2; it further includes a controller, which is electrically connected and / or communicatively connected to the motor, the clutch mechanism, the first distance measurement module, and the second distance measurement module. The controller realizes the centering and clamping control of the hose in the following manner: S10: Obtain the radius R of the hose to be tested, the first position S1 of the lower clamping plate relative to the lower clamping plate reference zero point O1, and the second position S2 of the upper clamping plate relative to the upper clamping plate reference zero point O2, and calculate the distances between the first position S1 and the second position S2 and the target centering position S3 of the hose to be tested respectively to obtain the first distance D1 and the second distance D2; S20: Judge whether the first distance D1 is equal to the second distance D2: If so, calculate the first difference △D1 between the first distance D1 or the second distance D2 and the radius R, control the clutch mechanism to work to realize the connection between the first transmission mechanism and the reverse transmission mechanism, control the motor to work to realize the power transmission between the motor, the first transmission mechanism, the clutch mechanism, the reverse transmission mechanism, and the second transmission mechanism, and drive the upper and lower clamping plates to move towards each other synchronously until the first difference △D1 is equal to 0; If not, execute step S30; S30: Calculate the second difference △D2 between the second distance D2 and the first distance D1, control the motor to work to realize the power transmission from the motor to the first transmission mechanism, drive the upper clamping plate to move downward until the second difference △D2 is equal to 0, and execute step S20.

2. The automatic fixture system for hose pressure resistance test according to claim 1, characterized in that: The lower clamping plate reference zero point O1 is the lower limit position that the lower clamping plate can reach, and the upper clamping plate reference zero point O2 is the upper limit position that the upper clamping plate can reach; The first position S1 of the lower clamping plate is the position reached after the lower clamping plate moves a distance d1 relative to the lower clamping plate reference zero point O1, and the second position S2 of the upper clamping plate is the position reached after the upper clamping plate moves a distance d2 relative to the upper clamping plate reference zero point O2.

3. The automatic fixture system for hose pressure resistance test according to claim 2, characterized in that: It further includes a first pressure sensor arranged on the lower clamping plate and capable of contacting the hose to be tested, and a second pressure sensor arranged on the upper clamping plate and capable of contacting the hose to be tested; the first pressure sensor and the second pressure sensor are respectively used to detect the pressure P1 and the pressure P2 received by the lower clamping plate and the upper clamping plate.

4. The automatic clamping system for the hose pressure resistance test according to claim 3, wherein, It further includes a control method for preventing excessive clamping force during the centering and clamping process of the hose: Obtain pressure P1 and pressure P2, and determine whether it satisfies that pressure P1 is less than or equal to the first pressure threshold P 1-set , and pressure P2 is less than or equal to the second pressure threshold P 2-set . If not satisfied, control the motor to stop working.

5. The automatic fixture system for the pressure resistance test of hoses according to claim 4, characterized in that The clutch mechanism includes: Clutch mechanism bearing seat, and a cylinder module disposed within the bearing seat of the clutch mechanism. The cylinder module includes a piston chamber disposed within the bearing seat of the clutch mechanism, a piston disposed within the piston chamber and slidable therein, a piston rod, and an end cap disposed at one end of the piston chamber. One end of the piston rod is located within the piston chamber and fixedly connected to the piston, and the other end penetrates through the end cap and extends outside the bearing seat. and a first bearing, the outer ring of the first bearing being fixedly connected to the bearing seat of the clutch mechanism. and a second bearing, the outer ring of the second bearing being fixedly connected to the piston rod of the cylinder module. Wherein, the axes of the first bearing and the second bearing are on the same straight line.

6. The automatic fixture system for hose pressure resistance test according to claim 5, characterized in that: The first transmission mechanism is a ball screw transmission mechanism, including a first screw fixedly connected to the output shaft of the motor, and a first moving block sleeved on the first screw through a plurality of balls and forming a screw pair with the first screw. The first screw penetrates through the gantry and extends into the fixed base, and the first moving block is fixedly connected to the upper clamping plate. The reverse transmission mechanism is a gear transmission mechanism, including a driving shaft, a driving gear sleeved on the driving shaft and fixedly connected thereto, a driven shaft, and a driven gear sleeved on the driven shaft and fixedly connected thereto. The driving gear and the driven gear are externally meshed. The second transmission mechanism is a ball screw transmission mechanism, which includes a second screw and a second moving block sleeved on the second screw through a plurality of balls and forming a screw pair with the second screw. The second screw is fixedly connected to the driven shaft, and the second moving block is fixedly connected to the lower clamping plate. The clutch mechanism is fixedly disposed within the fixed base, and a first long key groove and a second long key groove are respectively disposed at both ends of the inner ring of the second bearing. The first screw is fixedly connected to the inner ring of the first bearing, and the first screw and the inner ring of the second bearing are key-connected through the first long key groove. The driving shaft and the inner ring of the second bearing are key-connected through the second long key groove.

7. The automatic fixture system for hose pressure resistance test according to claim 6, characterized in that: The first screw and the second screw are arranged in the vertical direction, and the second screw and the first screw are respectively arranged on both sides of the reverse transmission mechanism.

8. The automatic fixture system for hose pressure resistance test according to claim 7, characterized in that: The first distance measuring module is a wire-pulling type displacement sensor, which includes a hub fixedly disposed on the fixed base, a precision rotation sensor connected to the hub, a wire rope wound around the hub, and a signal processor. One end of the wire rope is fixedly connected to the lower clamping plate, and the other end is fixedly connected to the hub. The signal processor converts the rotation signal of the precision rotation sensor into an electrical signal for output. The second ranging module is also a wire-pulling type displacement sensor, which includes a hub fixedly arranged on the gantry, a precision rotation inductor connected to the hub, a pull rope wound around the hub, and a signal processor; one end of the pull rope is fixedly connected to the upper clamping plate, and the other end thereof is fixedly connected to the hub, and the signal processor converts the rotation signal of the precision rotation inductor into an electrical signal for output.

9. The automatic fixture system for the hose pressure resistance test according to claim 8, characterized in that: The first lead screw and the second lead screw are arranged in the vertical direction, and the second lead screw and the first lead screw are respectively arranged on both sides of the reverse transmission mechanism.

10. The automatic fixture system for the pressure resistance test of the hose according to claim 9, characterized in that: The upper edge of the lower clamping plate and the lower edge of the upper clamping plate are in a U shape or a V shape.

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