Latch device for bridge erecting machine legs

Abstract

The present invention provides a latch device suitable for the legs of a bridge erecting machine, and relates to the technical field of bridge erecting machines, and comprises: a leg column, the leg column being evenly provided with a plurality of first pin holes along its axial direction; a lower cross beam, the lower cross beam being sleeved on the leg column, the lower cross beam being provided with a second pin hole; the latch device further comprises: a driving mechanism, the driving mechanism being fixed to the lower cross beam, and the driving mechanism being provided with a telescopic rod that can be telescoped along a straight line; and a pin shaft, the axis of the pin shaft being parallel to the axis of the telescopic rod, and one end of the pin shaft being fixed to the telescopic rod, and when the second pin hole is aligned with the first pin hole, the other end of the pin shaft can simultaneously penetrate the second pin hole and the first pin hole. The present invention can reduce the overall length and occupied space of the latch device, and improve the operational stability of the latch device.

Description

Technical Field

[0001] The invention relates to the technical field of bridge erection machines, and in particular to a latch device suitable for supporting legs of a bridge erection machine. Background Art

[0002] The supporting leg columns of the bridge-building machine are divided into an inner column and an outer column, and the inner column is inserted in the outer column. Both the inner column and the outer column are provided with a number of pin holes. When adjusting the height of the supporting legs of the bridge-building machine, the bridge-building machine adjusts the relative positions of the inner column and the outer column by inserting the adjustment pin shaft into the hole to achieve the adjustment of the height of the supporting legs. However, the pin shaft weighs more than ten kilograms and is generally 60mm or 100mm in diameter. In the prior art, it is generally operated by manually inserting and pulling out the pin shaft, which has high labor intensity. In addition, the front supporting legs of the bridge-building machine stand on the bridge pier. The space for the pin insertion operation is small and the height is high. The safety risk of manual operation at high height is extremely high.

[0003] The existing patent name is "Telescopic Leg Device for Tunnel Bridge Erection Machine" and the publication number is CN104727228A. The patent has a first-level telescopic column telescopically connected below the main beam outer column. The main beam outer column is connected to an automatic latch device including a latch cylinder and a first latch. The latch cylinder is connected to the first latch, and the axes of the two are in the same straight line. When the patent drives the latch cylinder to move linearly to pull out the first-level telescopic column, the first-level telescopic column and the main beam outer column are unlocked, and the two can slide relative to each other to achieve extension to adjust the height of the bridge erection machine legs; when the bridge erection machine legs are adjusted, the pin cylinder drives the latch to move linearly to insert the first-level telescopic column, and the first-level telescopic column is locked with the main beam outer column. The patent uses the latch cylinder and the latch to replace manual labor to achieve automatic latching, reducing the labor intensity of the operator.

[0004] However, in the above patent, the latch cylinder and the pin shaft are on the same axis, the overall length is large, the occupied space is large, the pin shaft cantilever is long, and the operation stability of the automatic latch device is poor. Summary of the invention

[0005] The purpose of the present invention includes providing a latch device suitable for the legs of a bridge erecting machine, which is designed for the bridge erecting machine and can reduce the overall length and occupied space of the latch device and improve the operating stability of the latch device.

[0006] The embodiments of the present invention are implemented by the following technical solutions:

[0007] A latch device suitable for a bridge erection machine leg comprises: a leg column, the leg column being evenly distributed with a plurality of first pin holes along its axial direction; a lower cross beam, the lower cross beam being sleeved on the leg column, the lower cross beam being provided with a second pin hole; the latch device further comprises: a driving mechanism, the driving mechanism being fixed to the lower cross beam, and the driving mechanism being provided with a telescopic rod that can be telescoped along a straight line; and a pin shaft, the axis of the pin shaft being parallel to the axis of the telescopic rod, and one end of the pin shaft being fixed to the telescopic rod, and when the second pin hole is aligned with the first pin hole, the other end of the pin shaft can simultaneously penetrate the second pin hole and the first pin hole.

[0008] In one embodiment of the present invention, the column is a hollow box-shaped column, and a guide member for guiding the pin shaft to pass through the first pin hole is fixed to the inner wall of the box-shaped column.

[0009] In one embodiment of the present invention, the guide member is a guide cone sleeve, the small-diameter end of the guide cone sleeve is fixed to the box-shaped column and communicated with the first pin hole.

[0010] In one embodiment of the present invention, the latch device further comprises a locking mechanism, which is fixed to the lower cross beam, and the locking mechanism is provided with a telescopic locking rod, and the pin shaft is provided with a locking groove, and the locking rod can be inserted into the locking groove.

[0011] In one embodiment of the present invention, the locking mechanism also includes a guide sleeve, a locking compression spring and an unlocking drive unit, one end of the guide sleeve is fixed to the lower cross beam through a support, the other end of the guide sleeve is provided with a guide hole, one end of the locking rod is provided with a limit ring, the other end of the locking rod passes through the guide hole from the guide sleeve and extends to the outside of the guide sleeve, the locking compression spring is arranged in the guide sleeve, one end of the locking compression spring abuts against the locking rod, the locking compression spring drives the locking rod to extend out of the guide sleeve or maintains the tendency to extend out of the guide sleeve, the unlocking drive unit is fixed to the support, and the unlocking drive unit is provided with a connecting rod fixed to the locking rod, and the unlocking drive unit can drive the locking rod to retract into the guide sleeve.

[0012] In one embodiment of the present invention, a compression spring guide shaft is provided in the guide sleeve, the locking compression spring sleeve is provided on the compression spring guide shaft and abuts against the compression spring guide shaft, the compression spring guide shaft is provided with a center hole, and the connecting rod passes through the center hole.

[0013] In one embodiment of the present invention, the latch device also includes a control device; a pin hole centering detection device, the pin hole centering detection device is provided with a camera for photographing the first pin hole relative to the second pin hole, and the control device determines whether the first pin hole and the second pin hole are aligned based on image information captured by the camera.

[0014] In one embodiment of the present invention, a conical surface is provided at the end of the free end of the pin shaft.

[0015] In one embodiment of the present invention, the driving mechanism is a driving hydraulic cylinder.

[0016] In one embodiment of the present invention, the latch device also includes a pin pulling out position detection mechanism, which is fixed to the lower cross beam. The driving mechanism is provided with a retractable telescopic rod and a position detection sensor. During the pin pulling process, when the telescopic rod is inserted into the locking groove, the position detection sensor is triggered and sends a signal to the control device.

[0017] The technical solution of the embodiment of the present invention has at least the following advantages and beneficial effects:

[0018] The embodiment of the present invention adopts a driving mechanism with a telescopic rod that can be telescoped along a straight line, and makes the axis of the pin shaft parallel to the axis of the telescopic rod and no longer on the same axis. The driving mechanism is used to drive the pin shaft to be inserted into the first pin hole and the second pin hole, or the driving mechanism is used to drive the pin shaft to be pulled out of the first pin hole and the second pin hole. Compared with the structure in the prior art where the pin shaft and the hydraulic cylinder are on the same axis, this embodiment can reduce the overall length and occupied space of the latch device, and can improve the operating stability of the latch device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 It is a schematic diagram of the structure of the hydraulic outrigger and the latch device in the present invention;

[0021] Figure 2 It is a structural schematic diagram of the lower cross beam in the present invention;

[0022] Figure 3 It is a schematic diagram of the pin shaft of the present invention being inserted into the first pin hole and the second pin hole at the same time;

[0023] Figure 4 It is a structural schematic diagram of the pin shaft in the present invention;

[0024] Figure 5 This is a schematic diagram of the present invention when the locking structure is omitted and the pin is in place;

[0025] Figure 6 This is a schematic diagram of the present invention in which the locking structure is omitted and the pin is pulled out;

[0026] Figure 7 It is a structural schematic diagram of the locking mechanism or the pin-pulling-in-place detection mechanism in the present invention;

[0027] Figure 8 It is a structural schematic diagram of the locking rod in the present invention;

[0028] Fig. 9 is a second structural schematic diagram of the connecting plate in the present invention;

[0029] Fig.10 It is a schematic diagram of the structure when the pin shaft is pulled out into place in the present invention.

[0030] Icons: 1- leg column, 11- first pin hole, 21- lower beam, 22- upper beam, 211- second pin hole, 3- pin shaft, 31- cone surface, 32- locking groove, 4- driving hydraulic cylinder, 5- guide cone sleeve, 6- locking mechanism, 61- locking rod, 611- limiting ring, 62- guide sleeve, 63- locking compression spring, 64- unlocking hydraulic cylinder, 65- support, 66- compression spring guide shaft, 67- connecting rod, 7- connecting plate, 71- arc structure, 81- support plate, 82- pin in place detection mechanism, 821- pin locking rod, 8211- pin limiting ring, 822- pin guide sleeve, 823- pin locking compression spring, 824- pin unlocking hydraulic cylinder, 825- pin support, 826-pin puller compression spring guide shaft, 827-pin puller connecting rod, 91-outrigger hydraulic cylinder, 92-main beam. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0034] In the description of the present invention, it should be noted that if the terms "inside" or "outside" appear to indicate an orientation or position relationship, it is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the invention is usually placed when in use. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0035] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "configure", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] Embodiment 1

[0037] Please refer to Figures 1 to 6 This embodiment provides a latch device suitable for the legs of a bridge erection machine, which includes: a leg column 1, a lower crossbeam 21, a driving mechanism and a pin shaft 3.

[0038] In the prior art, the support leg column 1 of the bridge erecting machine is generally a hollow box-shaped column. The support leg column 1 can also be a column with a cross-section of other shapes, or a solid column. The support leg column 1 in this embodiment adopts a hollow box-shaped column, and one leg includes two left and right support leg columns 1 parallel to each other, each support leg column 1 has a plurality of first pin holes 11 evenly distributed along its axial direction, and the first pin holes 11 pass through the support leg column 1.

[0039] Please refer to Figure 1 The lower cross beam 21 is a conventional structure on the existing bridge erecting machine. The lower cross beam 21 is simultaneously mounted on the two leg columns 1. The lower cross beam 21 can slide up and down along the leg columns 1 to adjust the leg length. Two left and right second pin holes 211 are provided on the lower cross beam 21. The left second pin hole 211 corresponds to the first pin hole 11 of the left leg column 1, and the right second pin hole 211 corresponds to the first pin hole 11 of the left leg column 1. When the lower cross beam 21 rises or falls to a certain height, the pin shaft 3 is simultaneously passed through the first pin hole 11 and the second pin hole 211 to lock the lower cross beam 21 with the leg column 1, so as to adjust the leg length.

[0040] Please refer to Figure 1The driving mechanism is fixed on the lower cross beam 21. In the present embodiment, two driving mechanisms are provided, and one driving mechanism corresponds to one pin shaft 3. It should be noted that only one driving mechanism may be provided, and one driving mechanism is used to drive the two pin shafts 3 to move synchronously. The driving mechanism is between the two pin shafts 3, and the driving mechanism is installed in the lower cross beam 21. Those skilled in the art may also adopt other technical solutions that utilize one driving mechanism to realize the synchronous movement of the two pin shafts 3, as long as the driving mechanism does not interfere with the relative movement between the lower cross beam 21 and the support leg column 1.

[0041] The driving mechanism in this embodiment is provided with a telescopic rod that can be extended and retracted along a straight line. Specifically, the driving mechanism can be a driving hydraulic cylinder 4 or other actuators that can realize linear motion output. In this embodiment, the driving mechanism adopts a driving hydraulic cylinder 4, and the telescopic rod that can be extended and retracted along a straight line is the piston rod of the driving hydraulic cylinder 4. In order to reduce the overall length of the latch device, reduce the space occupied by the latch device, and improve the operating stability of the latch device, in this embodiment, the pin shaft 3 is arranged parallel to the driving hydraulic cylinder 4, that is, the axis of the pin shaft 3 is parallel to the axis of the piston rod of the driving hydraulic cylinder 4, and one end of the pin shaft 3 is fixed to the piston rod of the driving hydraulic cylinder 4 through a connecting plate 7. When the second pin hole 211 is aligned with the first pin hole 11, the driving hydraulic cylinder 4 drives the pin shaft 3 to pass through the second pin hole 211 and the first pin hole 11 at the same time to achieve the locking of the lower cross beam 21 and the support leg column 1.

[0042] Please refer to Figure 3 Since the support leg column 1 is a hollow box-shaped column and the pin 3 can be regarded as a cantilever beam structure, when the free end of the pin 3 passes through the first pin hole 11 on one side of the support leg column 1 and is inserted into the box-shaped column, the free end of the pin 3 may be displaced to a certain extent due to its large deadweight, and the axis of the pin 3 is no longer colinear with the axis of the first pin hole 11, resulting in the free end of the pin 3 being unable to pass through the first pin hole 11 on the other side of the support leg column 1 normally. In order to allow the pin shaft 3 to smoothly pass through the entire leg column 1, a guide member for guiding the pin shaft 3 to pass through the first pin hole 11 is fixed on the inner wall of the box column. The guide member may be a guide member with a guide slope or other guide structure. The guide member of this embodiment is a guide cone sleeve 5, which is in a trumpet shape. The small-diameter end of the guide cone sleeve 5 is fixed on the inner wall of the box column and communicates with the first pin hole 11. When the free end of the pin shaft 3 is inserted into the leg column 1, the conical surface 31 of the guide cone sleeve 5 is used to guide the pin shaft 3 to pass through the first pin hole 11 to avoid failure of the pin insertion. It should be noted that since the leg column 1 is provided with first pin holes 11 on both sides, the inner wall of the side with the first pin hole 11 in the leg column 1 can be fixedly installed with a guide cone sleeve 5.

[0043] Please refer to Figures 5 and 6It should be noted that the strength and rigidity of the connecting plate 7 between the driving hydraulic cylinder 4 and the pin shaft 3 must be able to resist the torque of the pin shaft 3 on the connecting plate 7 to prevent the connecting plate 7 from being bent. In addition, during the bolting action, when the pin shaft 3 collides with the guide cone sleeve 5 and continues to be inserted, the connecting plate 7 may vibrate. This embodiment increases the thickness of the connecting plate 7 or uses a high-strength steel plate to avoid the vibration of the connecting plate 7 during the bolting process. Please refer to Fig. 9 The connecting plate 7 may also be provided with an arc structure 71 to further enhance the strength of the connecting plate 7 and improve the stability of the connecting plate 7 .

[0044] Please refer to Figure 4 In order to make the pinning action of the pin shaft 3 smoother, a conical surface 31 is provided at the end of the free end of the pin shaft 3. The conical surface 31 at the end of the pin shaft 3 is used to guide the pin shaft 3 to be smoothly inserted into the first pin hole 11 or the second pin hole 211. In this embodiment, the pinning action of the pin shaft 3 is smoother through the dual guidance of the conical end and the guide cone sleeve 5.

[0045] Please refer to Figures 3 to 6 , Figures 7 and 8 After the pin 3 is inserted into the first pin hole 11 and the second pin hole 211, that is, after the lower cross beam 21 is fixed to the leg column 1 through the pin 3, in order to keep the pin 3 locked and prevent the pin 3 from falling off the latch device, the latch device is also provided with a locking mechanism 6, one pin 3 corresponds to one locking mechanism 6, and the pin 3 is provided with a locking groove 32, which is an annular groove. When the pin 3 is inserted into place, the locking mechanism 6 and the locking groove 32 are used to lock the pin 3 to prevent the pin 3 from loosening due to impact or equipment movement.

[0046] Please refer to Figures 7 and 8 The locking mechanism 6 includes a locking rod 61, a guide sleeve 62, a locking compression spring 63 and an unlocking drive unit. One end of the guide sleeve 62 is fixed to the lower cross beam 21 through a support 65, and the other end of the guide sleeve 62 is provided with a guide hole. One end of the locking rod 61 is provided with a limiting ring 611, and the other end of the locking rod 61 passes through the guide hole from the guide sleeve 62 and extends to the outside of the guide sleeve 62. The diameter of the limiting ring 611 is larger than the aperture of the guide hole, and the limiting ring 611 is located in the guide sleeve 62. The locking rod 61 is prevented from completely disengaging from the guide sleeve 62 by the limiting ring 611, so as to realize the connection between the locking rod 61 and the guide sleeve 62. The locking compression spring 63 is located in the guide sleeve 62, and one end of the locking compression spring 63 abuts against the locking rod 61, and the other end of the locking compression spring 63 abuts against the support 65. The locking compression spring is initially in a compressed state, and the locking rod 61 is kept in an extended state by the locking compression spring 63. The unlocking drive part is fixed on the support 65 , and is provided with a connecting rod 67 fixed to the locking rod 61 . The unlocking drive part may adopt a cylinder, a hydraulic cylinder or other actuators. The unlocking drive part of this embodiment adopts an unlocking hydraulic cylinder 64 .

[0047] During the latch action, the unlocking hydraulic cylinder 64 is in an unloaded state, and the locking rod 61 remains extended only under the action of the locking compression spring 63 until it contacts the conical surface 31 of the pin shaft 3, and the locking rod 61 is forced to retract into the guide sleeve 62. When the locking rod 61 is aligned with the locking groove 32 of the pin shaft 3, the locking rod 61 pops into the locking groove 32, and the locking rod 61 remains locked to the pin shaft 3 under the action of the locking compression spring 63; when the pin shaft 3 is unlocked, the unlocking hydraulic cylinder 64 is in a loaded state, the unlocking hydraulic cylinder 64 retracts and drives the locking rod 61 to retract into the guide sleeve 62 through the connecting rod 67, and at the same time, the locking rod 61 compresses the locking compression spring 63, so that the locking rod 61 escapes from the locking groove 32 of the pin shaft 3, so as to pull out the pin shaft 3. When the pin shaft 3 is pulled out, the unlocking hydraulic cylinder 64 resumes extension and unloading, and the locking rod 61 remains extended again under the action of the locking compression spring 63.

[0048] Please refer to Figure 7 In this embodiment, a compression spring guide shaft 66 is provided in the guide sleeve 62, and the locking compression spring 63 is sleeved on the compression spring guide shaft 66 and abuts against the compression spring guide shaft 66. The compression spring guide shaft 66 is used to guide the telescopic movement of the locking compression spring 63 to prevent the locking compression spring 63 from twisting during the compression process. The compression spring guide shaft 66 is provided with a central hole for the connecting rod 67 to pass through.

[0049] Please refer to Figure 3 , Figures 5 and 6 When the pin shaft 3 is pulled out by the driving hydraulic cylinder 4, when the unlocking hydraulic cylinder 64 is extended to the right position, the unlocking hydraulic cylinder 64 can be regarded as a cantilever beam, and the entire weight or most of the weight of the pin shaft 3 is borne by the piston rod of the unlocking hydraulic cylinder 64. The weight of the pin shaft 3 can reach more than ten kilograms, which will cause the free end of the piston rod of the unlocking hydraulic cylinder 64 to tilt downward, so that the unlocking hydraulic cylinder 64 will have problems such as oil leakage, which will shorten the life of the unlocking hydraulic cylinder 64. In order to avoid shortening the service life of the unlocking hydraulic cylinder 64, in this embodiment, a supporting plate 81 is provided on the outer wall of the lower cross beam 21. When the pin shaft 3 is pulled out to the right position, the end of the pin shaft 3 with the conical surface 31 is placed on the supporting plate 81, and part of the weight of the pin shaft 3 is shared by the supporting plate 81.

[0050] Embodiment 2

[0051] This embodiment is improved on the basis of the first embodiment. The difference between this embodiment and the first embodiment is that:

[0052] The latch device also includes a control device (not shown), which includes a controller and a sensor. The controller can be a PLC or an industrial computer. The controller of this embodiment adopts a PLC. The sensor includes a magnetostrictive displacement sensor for detecting the extension position of the hydraulic cylinder. The magnetostrictive displacement sensor is installed on the outrigger hydraulic cylinder 91. The outrigger height adjustment value is set in the PLC, and the outrigger hydraulic cylinder 91 is automatically controlled to extend by the PLC. When the magnetostrictive displacement sensor is triggered, it indicates that the extension stroke of the outrigger hydraulic cylinder 91 has reached the set value, and the PLC controls the outrigger hydraulic cylinder 91 to stop extending and lock the oil cylinder.

[0053] It should be noted that an upper crossbeam 22 is sleeved between the two outrigger columns 1, and the outrigger hydraulic cylinder 91 is fixed on the upper crossbeam 22. The upper crossbeam 22 is also locked with the outrigger column 1 through a latch. When it is necessary to lift the outrigger column 1 upward, the latch between the upper crossbeam 22 and the outrigger column 1 is pulled out, and the lower crossbeam 21 is locked with the outrigger column 1 through the latch. The outrigger hydraulic cylinder 91 is retracted to lift the outrigger column 1. After the height of the outrigger column 1 is raised, the upper crossbeam 22 and the outrigger column 1 are locked with the latch. When the position of the lower crossbeam 21 relative to the outrigger column 1 is to be adjusted, the latch of the upper crossbeam 22 and the outrigger column 1 is kept locked, the latch between the upper crossbeam 22 and the outrigger column 1 is pulled out, and the lower crossbeam 22 is driven to move to the set position through the outrigger hydraulic cylinder 91, and the lower crossbeam 21 and the outrigger column 1 are locked with the latch.

[0054] A pin hole centering detection device is also provided on the lower cross beam 21. The pin hole centering detection device can adopt a CCD visual detection system, which obtains images of the first pin hole 11 and the second pin hole 211 through a CCD camera. The PLC obtains the image information and displays it to the operator. The operator determines whether the first pin hole 11 and the second pin hole 211 are aligned based on the image information. If the operator confirms that the first pin hole 11 and the second pin hole 211 are aligned, the PLC controls the action of the pin latch hydraulic cylinder to realize automatic pin latching.

[0055] The PLC is connected to a latch protection device, which may be a sensor on the guide sleeve 62 or the locking rod 61. When the locking rod 61 is retracted into the guide sleeve 62, the sensor is not triggered, indicating that the pin 3 is not locked. When the locking rod 61 extends out of the guide sleeve 62 and the limit ring 611 is pressed against the guide sleeve 62, the sensor is triggered, indicating that the latch is successful and the pin 3 is locked. After the sensor is triggered, it sends a signal to the PLC, which allows the bridge erection machine to continue operating and ensures the safety of the bridge erection operation.

[0056] Please refer to Figure 3 and Fig.10The latch device of this embodiment is further provided with a pin pulling in place detection mechanism 82, which is fixed on the support plate 81, and has the same structure as the locking mechanism 6. The structure of the pin pulling in place detection mechanism 82 is as follows: Figure 7 and Figure 8 It should be noted that Figure 7 and Figure 8 The structure of the unlocking mechanism 6 and the pin removal detection mechanism 82 is shown. Figure 7 and Figure 8 The reference numerals without brackets represent the structure of the unlocking mechanism 6 , and the reference numerals with brackets represent the structure of the pin removal detection mechanism 82 .

[0057] The pin-unlocking hydraulic cylinder 824 of the pin-unlocking detection mechanism 82 is provided with a magnetostrictive displacement sensor for detecting the telescopic state of the piston rod of the pin-unlocking hydraulic cylinder 824. When the pin shaft 3 is in the state of being locked and latched, as shown in FIG. Figure 3 , the pin-unlocking hydraulic cylinder 824 of the pin-unlocking detection mechanism 82 is unloaded, and the pin-unlocking rod 821 is retracted into the pin-unlocking guide sleeve 822 under the pressure of the pin shaft 3. At the same time, the pin-unlocking rod 821 compresses the pin-unlocking compression spring 823, and the piston rod of the pin-unlocking hydraulic cylinder 824 is retracted and the magnetostrictive displacement sensor is not triggered. Fig.10 , the locking mechanism 6 is unlocked, the pin shaft 3 is pulled out, until the pin pulling locking rod 821 of the pin pulling in place detection mechanism 82 bounces into the locking groove 32, the piston rod of the pin pulling unlocking hydraulic cylinder 824 is extended and the magnetostrictive displacement sensor is triggered, and after the PLC receives the signal that the magnetostrictive displacement sensor is triggered, the PLC determines that the pin shaft 3 is pulled out in place and locked, and the PLC controls the driving hydraulic cylinder 4 to stop extending and unlocks the operator's authority to perform the next operation. If the PLC determines that the pin shaft 3 is not pulled out in place, the operator cannot perform the next operation, so as to play a role of safety protection.

[0058] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A latch device for a bridge erecting machine leg, comprising: A leg column, wherein the leg column has a plurality of first pin holes evenly distributed along its axial direction; A lower cross beam, the lower cross beam is sleeved on the support leg column, and the lower cross beam is provided with a second pin hole; Characterized in that the latch device also includes: A driving mechanism, the driving mechanism is fixed to the lower cross beam and is provided with a telescopic rod that can be telescoped along a straight line; and A pin shaft, the axis of which is parallel to the axis of the telescopic rod but not on the same axis, and one end of the pin shaft is fixed to the telescopic rod, and when the second pin hole is aligned with the first pin hole, the other end of the pin shaft can pass through the second pin hole and the first pin hole at the same time; The locking mechanism is fixed to the lower cross beam, the locking mechanism is provided with a telescopic locking rod, the pin shaft is provided with a locking groove, and the locking rod can be inserted into the locking groove; the locking mechanism also includes a guide sleeve, a locking compression spring and an unlocking drive part, one end of the guide sleeve is fixed to the lower cross beam through a support, the other end of the guide sleeve is provided with a guide hole, one end of the locking rod is provided with a limiting ring, the other end of the locking rod passes through the guide hole from the guide sleeve and extends outside the guide sleeve, the locking compression spring is arranged in the guide sleeve, one end of the locking compression spring abuts against the locking rod, the locking compression spring drives the locking rod to extend out of the guide sleeve or maintains the tendency of extending out of the guide sleeve, the unlocking drive part is fixed to the support, and the unlocking drive part is provided with a connecting rod fixed to the locking rod, and the unlocking drive part can drive the locking rod to retract into the guide sleeve; The latch device further includes a control device and a pin hole centering detection device, the pin hole centering detection device is provided with a camera for photographing the first pin hole relative to the second pin hole, and the control device determines whether the first pin hole and the second pin hole are centered based on the image information photographed by the camera; The pin pulling in place detection mechanism has the same structure as the locking mechanism. The pin pulling in place detection mechanism is fixed to the lower cross beam. The pin pulling in place detection mechanism is provided with a retractable telescopic rod and a position detection sensor. During the pin pulling process, when the telescopic rod is inserted into the locking groove, the position detection sensor is triggered and sends a signal to the control device; The pin-pulling and unlocking hydraulic cylinder of the pin-pulling and in-place detection mechanism is provided with a magnetostrictive displacement sensor for detecting the telescopic state of the piston rod of the pin-pulling and unlocking hydraulic cylinder; when the pin shaft keeps the pin inserted and locked, the pin-pulling and unlocking hydraulic cylinder of the pin-pulling and in-place detection mechanism is unloaded, and the pin-pulling and locking rod is retracted into the pin-pulling and guiding sleeve under the pressure of the pin shaft, and at the same time, the pin-pulling and locking rod compresses the pin-pulling and locking compression spring, and the piston rod of the pin-pulling and unlocking hydraulic cylinder is retracted and the magnetostrictive displacement sensor is not triggered; During the pin pulling process, the locking mechanism is unlocked and the pin shaft is pulled out until the pin pulling locking rod of the pin pulling in place detection mechanism pops into the locking groove, the piston rod of the pin pulling unlocking hydraulic cylinder extends and the magnetostrictive displacement sensor is triggered. After the control device receives the signal that the magnetostrictive displacement sensor is triggered, the control device determines that the pin shaft is pulled out in place and locked, and the control device controls the driving hydraulic cylinder to stop extending and unlocks the operator's authority to perform the next operation.

2. The latch device according to claim 1, characterized in that Also includes, The column is a hollow box-shaped column, and a guide member for guiding the pin shaft to pass through the first pin hole is fixed on the inner wall of the box-shaped column.

3. The latch device according to claim 2, characterized in that: The guide member is a guide cone sleeve, the small-diameter end of which is fixed to the box-shaped column and communicated with the first pin hole.

4. The latch device according to claim 1, characterized in that: A compression spring guide shaft is arranged in the guide sleeve, the locking compression spring is sleeved on the compression spring guide shaft and abuts against the compression spring guide shaft, the compression spring guide shaft is provided with a center hole, and the connecting rod passes through the center hole.

5. The latch device according to claim 1, characterized in that: The end of the free end of the pin shaft is provided with a tapered surface.

6. The latch device according to claim 5, characterized in that: The driving mechanism is a driving hydraulic cylinder.

Images