Slab clamp band load status detection apparatus and method of use

Abstract

The application provides a slab clamp belt load state detection device and a use method thereof, which comprises a shell, a mechanical part and an electrical part; the mechanical part comprises an armature displacement transmission mechanism, a variable ratio transmission mechanism, a preset length disengagement transmission bar and a temperature-resistant sensor; the armature displacement transmission mechanism is in transmission connection with a clamping armature; the variable ratio transmission mechanism is in transmission connection with the armature displacement transmission mechanism and the preset length disengagement transmission bar respectively; the variable ratio transmission mechanism is used for converting a transmission stroke of the armature displacement transmission mechanism into the disengagement transmission bar; the temperature-resistant sensor is in trigger connection with the disengagement transmission bar at a preset position of a transmission route; the temperature-resistant sensor is connected with the electrical part; and the electrical part is used for detecting a trigger signal of the temperature-resistant sensor. The application can not only detect a small stroke, but also can not be damaged by overshoot in a large stroke, and the tolerance of a high-temperature environment is improved, so that the belt load state detection of the clamp is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of slab clamp belt load state detection, in particular to a slab clamp belt load state detection device and a method thereof. BACKGROUND

[0002] Under the current situation of vigorously promoting industry 4.0, cranes also participate in the reform tide of intelligentization. At present, automatic cranes are widely used, and automation has also been widely popularized in slab hoisting cranes. However, with the operation of automatic cranes, various problems have gradually emerged in the process of slab hoisting operation.

[0003] At present, slab hoisting still uses clamp hoisting, whether using electric slab clamp or using gravity slab clamp. At present, it is still difficult to detect the clamp belt load state, and the clamp belt load state plays a crucial role in automatic cranes, because whether the load is normally lifted by the lifting tool determines how the next stage of the crane is executed, directly affecting the safety of the automatic crane. Due to the special structure of the slab hoisting clamp, it is difficult to detect the clamp belt load state, because the slab is usually hoisted in many working conditions, and the temperature of the hot slab just off the line can reach several hundred degrees. It is difficult to install detection sensors in this environment, so it is difficult to detect the slab clamp belt load state at present.

[0004] At present, electric slab clamps have slab height detection equipment, which is used to detect the number and thickness of the slab hoisted by the clamp. At present, automatic cranes usually detect the slab clamp belt load state with this equipment, but because the functions have different focuses, the slab height detection equipment can only roughly detect the load state of the center position of the clamp. The slab clamp has two pairs of clamp arms, and each pair of clamp arms has two jaws. During the process of hoisting the slab, the state of each jaw is uncertain, and the state of each jaw must be accurately detected to ensure the certainty of the clamp belt load state, and then to ensure the safety of the crane lifting. At present, there are still many slab clamps on the market that use gravity clamps. Because the gravity clamp has a simple structure, mature technology, low failure rate and low price, it has been widely used before the popularization of automatic cranes. Therefore, it cannot be eliminated after the popularization of automatic cranes, so many automatic cranes still use gravity clamps. The basic structure of the gravity clamp makes it difficult to install electrical detection equipment, so it is still difficult to implement full automation in automatic cranes using gravity clamps.

[0005] The Chinese patent document with the publication number CN106006389A discloses a slab clamp height intelligent detection equipment, which comprises a measurement module, a correction limit, a decoding module, a CPU module, an SPC3 module and a DP interface module; the measurement module is connected with the decoding module; the decoding module and the correction limit are connected with the CPU module; the CPU module is connected with the SPC3 module; the SPC3 module is connected with the DP interface module; the correction limit is a rotary cam limit, and the cam limit is mechanically connected with the encoder through a reduction gear set.

[0006] All slab clamps are usually provided with a clamping armature on the jaw of the clamp due to the hoisting process, and the clamping armature will slide downward due to gravity after the clamp clamps the slab and hoists it, and the installation process of the clamping armature determines that the clamping armature will protrude outward during the sliding process, so that the clamping force of the clamp on the slab becomes larger and larger, thereby ensuring that the hoisting of the slab is safer and more reliable. Therefore, judging the load state of the clamp according to the action state of the clamping armature is the most reliable way.

[0007] At present, technical innovation, intelligentization and automation and remote operation are being carried out in the crane industry, and data collection is required for each key device of the crane to meet the requirements of new technologies, and the detection of the load state of the clamp is particularly important, and it is imperative to detect the load state of the clamp, otherwise it will seriously affect the implementation pace of the subsequent automatic crane.

[0008] Based on the foregoing description, it is difficult to implement the load state detection of the clamp without changing the structural state of the clamp, and the hoisted slab usually has high temperature, and the edge of the slab is usually irregular due to the production line, and the movement stroke of the clamping armature on the four clamp legs is also uncertain, which usually changes between a few millimeters and a few centimeters, so it is difficult to install the general switch device, which is either low in high temperature resistance or cannot meet the requirements of stroke change. Because the switch that can meet the small stroke requirement is only a micro switch or a proximity switch, the proximity switch has low high temperature resistance, and the micro switch can meet the high temperature requirement and small stroke detection requirement, but it will have stroke overshoot under large stroke, resulting in switch damage. The switch that can meet the large stroke requirement is basically a lever switch, and such a switch is not sensitive to small stroke detection and has obvious stroke lag, which cannot meet the detection requirements of small stroke.

[0009] According to the related technology in the above, the inventor believes that the existing detection equipment cannot simultaneously meet the requirements of small stroke detection, no overshoot damage under large stroke detection and high temperature environment, and the adaptability of the existing detection equipment is poor. SUMMARY

[0010] Aiming at the defects in the prior art, the present application aims to provide a slab clamp belt load state detection device and a use method thereof.

[0011] The slab clamp belt load state detection device provided by the present application comprises a shell, a mechanical part and an electrical part.

[0012] The mechanical part comprises an armature displacement transmission mechanism, a variable ratio transmission mechanism, a preset length disengagement transmission bar and a temperature-resistant sensor.

[0013] The armature displacement transmission mechanism is in transmission connection with the clamping armature.

[0014] The variable ratio transmission mechanism is in transmission connection with the armature displacement transmission mechanism and the preset length disengagement transmission bar respectively.

[0015] The variable ratio transmission mechanism is used for converting the transmission stroke of the armature displacement transmission mechanism into the preset length disengagement transmission bar.

[0016] The temperature-resistant sensor is fixed in the shell, and the temperature-resistant sensor is in trigger connection with the preset length disengagement transmission bar on the transmission route.

[0017] The temperature-resistant sensor is connected with the electrical part.

[0018] The electrical part is used for connecting external equipment, detecting the trigger signal of the temperature-resistant sensor and converting the signal, and the converted signal is used for detection of the external equipment.

[0019] Preferably, the variable ratio transmission mechanism comprises a first transmission wheel and a second transmission wheel.

[0020] The first transmission wheel and the second transmission wheel are respectively arranged to rotate in the shell.

[0021] The second transmission wheel comprises a large transmission wheel and a small transmission wheel fixed coaxially, and the circumferences of the first transmission wheel and the large transmission wheel are greater than the circumference of the small transmission wheel.

[0022] The first transmission wheel is in transmission connection with the armature displacement transmission mechanism.

[0023] The first transmission wheel and the small transmission wheel are in transmission connection.

[0024] The large transmission wheel is in transmission connection with the preset length disengagement transmission bar.

[0025] Preferably, the electrical part and the mechanical part are respectively arranged in the shell.

[0026] The shell is provided with an electrical compartment partition plate for separating the electrical part and the mechanical part.

[0027] The electrical compartment partition plate is provided with a threading hole.

[0028] The temperature-resistant sensor is connected to the electrical part through a connecting line;

[0029] The connecting line is arranged through the wire hole.

[0030] Preferably, the mechanical part further comprises a reset mechanism for resetting the armature displacement transmission mechanism and the disengagement transmission bar;

[0031] The reset mechanism comprises a first elastic member and a second elastic member;

[0032] One end of the first elastic member is transmissionally connected to the armature displacement transmission mechanism, and the other end of the first elastic member is fixed in the housing;

[0033] One end of the second elastic member is transmissionally connected to the disengagement transmission bar, and the other end of the second elastic member is fixed in the housing.

[0034] Preferably, the housing is provided with a disengagement transmission sliding groove for limiting the disengagement transmission bar;

[0035] The disengagement transmission bar is slidingly connected to the disengagement transmission sliding groove.

[0036] Preferably, the armature displacement transmission mechanism comprises a lever transmission assembly, a steering transmission assembly, and a connection transmission assembly;

[0037] The lever transmission assembly is transmissionally connected to the clamping armature;

[0038] The lever transmission assembly is transmissionally connected to the steering transmission assembly;

[0039] The steering transmission assembly is transmissionally connected to the connection transmission assembly;

[0040] The connection transmission assembly is transmissionally connected to the first transmission wheel.

[0041] Preferably, the lever transmission assembly comprises a detection lever, a detection lever support, and a detection lever shaft;

[0042] The detection lever support is fixedly arranged in the housing;

[0043] The detection lever shaft is arranged on the detection lever support;

[0044] The detection lever is rotationally arranged on the detection lever shaft;

[0045] The housing is provided with a detection lever hole;

[0046] One end of the detection lever is movably arranged through the detection lever hole and transmissionally connected to the clamping armature;

[0047] The other end of the detection lever is transmissionally connected to the steering transmission assembly.

[0048] Preferably, the connecting transmission assembly includes a connecting transmission bar and a connecting transmission groove for limiting the position of the connecting transmission bar;

[0049] The connecting transmission bar is connected to the steering transmission assembly in a transmission connection;

[0050] The connecting transmission bar is connected to the first transmission wheel;

[0051] The connecting transmission groove is disposed inside the housing;

[0052] The connecting transmission bar is slidably connected to the connecting transmission groove.

[0053] Preferably, the testing device also includes a housing cover plate;

[0054] The cover plate fits into the shell to form a closed shell.

[0055] According to the present invention, a method for using a slab clamp load-bearing state detection device is provided. The device is installed on each clamp foot. When the slab is clamped and lifted, the clamping armature slides down due to gravity. The clamping armature and the armature displacement transmission mechanism work together to transmit power. The armature displacement transmission mechanism and the ratio transmission mechanism work together to transmit power, and then the armature displacement transmission mechanism and the disengagement transmission bar work together to transmit power. When the disengagement transmission bar moves to a preset position on the transmission path, it triggers a temperature sensor, causing the temperature sensor to activate. The electrical components detect the trigger signal from the temperature sensor and convert it, using the converted signal for detection by external equipment. The external equipment determines the clamping load-bearing state of the slab based on the status signals of each detected temperature sensor.

[0056] When the clamping stroke of the armature is small, the ratio transmission mechanism increases the transmission stroke of the armature displacement transmission mechanism and converts it to disengagement from the transmission bar.

[0057] When the stroke of the clamping armature is large, the disengagement transmission bar, due to its limited length, disengages from the transmission mechanism.

[0058] Compared with the prior art, the present invention has the following beneficial effects:

[0059] 1. This invention installs the detection device on the jaws of each clamp. When the clamp clamps the slab and lifts it, the clamping armature slides down due to gravity. The clamping armature and the armature displacement transmission mechanism work together to drive the armature. The armature displacement transmission mechanism works with the ratio transmission mechanism, which in turn drives the armature displacement transmission mechanism and the disengagement transmission bar. When the disengagement transmission bar moves to a preset position on the transmission path, it triggers the temperature resistance sensor, causing the temperature resistance sensor to activate. The electrical part detects the trigger signal of the temperature resistance sensor and converts it, using the converted signal for detection by external equipment. The external equipment determines the clamping condition of the slab based on the status signal of each detected temperature resistance sensor. The device operates in three states: When the armature clamping stroke is small, the shift ratio transmission mechanism increases the transmission stroke of the armature displacement transmission mechanism and transfers it to the disengagement transmission bar, improving the detection accuracy for small strokes; when the armature clamping stroke is large, the disengagement transmission bar, due to its limited length, disengages from the shift ratio transmission mechanism, thus preventing overshoot damage. Furthermore, because this detection device lacks a processor and does not directly contact the slab, it employs a high-temperature resistant sensor, effectively improving its tolerance to high-temperature environments. By simultaneously meeting the above three conditions, it achieves reliable detection of the clamp's load-bearing state, ensuring consistent and reliable monitoring. The use of electrical components facilitates timely monitoring of the detection status.

[0060] 2. After the clamp releases the slab, the clamped armature is reset. The reset mechanism facilitates the reset of the armature displacement transmission mechanism and the disengagement transmission bar, eliminating the need for manual reset and making it convenient for continued use next time.

[0061] 3. The present invention limits the disengagement of the transmission slide to the disengagement transmission bar, which is beneficial to the stability of the testing equipment during use. Attached Figure Description

[0062] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0063] Figure 1 This is a diagram of the overall structure.

[0064] Figure 2 This is a diagram of the shell structure;

[0065] Figure 3 This is a partial cross-sectional view of the shell;

[0066] Figure 4 This is a structural diagram of the first rack groove and the second rack pressure plate;

[0067] Figure 5 This is a schematic diagram of the overall assembly.

[0068] Figure 6 Schematic diagram of the mating hole for the armature clamping detection lever;

[0069] Figure 7 To examine the lever structure diagram;

[0070] Figure 8 This is a structural diagram of the first rack;

[0071] Figure 9 This is a structural diagram of the second gear;

[0072] Figure 10 This is a circuit diagram.

[0073] Figure label:

[0074] Housing 1, First rack 16, Wire hole 31

[0075] First gear 2, first rack groove 17, wire rope connecting post 32

[0076] Second gear 3, first spring 18, base 33

[0077] Second rack 4, second spring 19, spring ring 34

[0078] Photoelectric switch 5, circuit board 20, tooth profile 35

[0079] Second rack groove 6; Second rack pressure plate 21; Pulley shaft mounting hole 36

[0080] Detection lever 7, housing cover plate mounting post 22, detection lever mating hole 37

[0081] Detection lever bracket 8, first spring fixing post 23, housing cover plate 38

[0082] Detection lever shaft 9, first gear shaft 24, electrical compartment 39

[0083] Detect lever shaft hole 10, second gear shaft 25, circuit board mounting post 40

[0084] Detection lever hole 11, second spring fixing post 26, first gear platform 41

[0085] 12 pulley brackets, 27 circuit board mounting holes, 42 second gear platform

[0086] 13 pulleys, 28 electrical compartment partitions, 43 clamping armatures

[0087] Pulley shaft 14 Mounting bracket 29

[0088] Wire rope 15, mounting hole 30 Detailed Implementation

[0089] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0090] This invention discloses a slab clamp load condition detection device, including a housing 1, a mechanical part and an electrical part (electrical compartment 39).

[0091] The mechanical components include an armature displacement transmission mechanism, a ratio transmission mechanism, a pre-set length disengagement transmission bar (e.g., the second rack 4), a temperature sensor (e.g., a photoelectric switch 5), and a reset mechanism for resetting the armature displacement transmission mechanism and the disengagement transmission bar.

[0092] The armature displacement transmission mechanism is connected to the clamping armature 43; the ratio transmission mechanism is connected to the armature displacement transmission mechanism and the release transmission bar of a preset length; the ratio transmission mechanism is used to increase the transmission stroke of the armature displacement transmission mechanism and transfer it to the release transmission bar; the temperature sensor is fixed in the housing 1 and is triggered by the release transmission bar at a preset point in the transmission route; the temperature sensor is connected to the electrical part; the electrical part is used to connect to external equipment, detect the trigger signal of the temperature sensor and convert it, and use the converted signal for detection by the external equipment.

[0093] The variable ratio transmission mechanism includes a first transmission wheel (e.g., a first gear 2) and a second transmission wheel (e.g., a second gear 3); the first transmission wheel and the second transmission wheel are rotatably disposed within the housing 1; the second transmission wheel includes a large transmission wheel and a small transmission wheel fixed coaxially, and the circumference of the first transmission wheel and the large transmission wheel is greater than the circumference of the small transmission wheel; the first transmission wheel is connected to the armature displacement transmission mechanism; the first transmission wheel and the small transmission wheel are connected to each other; the large transmission wheel is connected to a disengagement transmission bar of a preset length.

[0094] The electrical and mechanical parts are respectively housed in the housing 1; the housing 1 is provided with an electrical compartment partition 28 that separates the electrical and mechanical parts; the electrical compartment partition 28 is provided with a wire hole 31; the temperature sensor is connected to the electrical part through a connecting wire; the connecting wire passes through the wire hole 31.

[0095] The reset mechanism includes a first elastic element (e.g., a first spring 18) and a second elastic element (e.g., a second spring 19); one end of the first elastic element is driven to the armature displacement transmission mechanism, and the other end of the first elastic element is fixed inside the housing 1; one end of the second elastic element is driven to the disengagement transmission bar, and the other end of the second elastic element is fixed inside the housing 1.

[0096] The housing 1 is provided with a disengagement transmission groove (e.g., the second rack groove 6) to limit the disengagement transmission bar; the disengagement transmission bar is slidably connected to the disengagement transmission groove.

[0097] The armature displacement transmission mechanism includes a lever transmission assembly, a steering transmission assembly, and a connecting transmission assembly; the lever transmission assembly is connected to the clamping armature 43; the lever transmission assembly is connected to the steering transmission assembly; the steering transmission assembly is connected to the connecting transmission assembly; and the connecting transmission assembly is connected to the first transmission wheel.

[0098] The lever transmission assembly includes a detection lever 7, a detection lever bracket 8, and a detection lever shaft 9; the detection lever bracket 8 is fixedly installed inside the housing 1; the detection lever shaft 9 is installed on the detection lever bracket 8; the detection lever 7 is rotatably installed on the detection lever shaft 9; the housing 1 is provided with a detection lever hole 11; one end of the detection lever 7 movably passes through the detection lever hole 11 and is connected to the clamping armature 43; the other end of the detection lever 7 is connected to the steering transmission assembly.

[0099] The connecting transmission assembly includes a connecting transmission bar (e.g., a first rack 16) and a connecting transmission groove (e.g., a first rack groove 17) for limiting the connecting transmission bar; the connecting transmission bar is connected to the steering transmission assembly; the connecting transmission bar is connected to the first transmission wheel; the connecting transmission groove is disposed in the housing 1; the connecting transmission bar is slidably connected to the connecting transmission groove.

[0100] The testing equipment also includes a housing cover plate 38, which is connected to the housing 1 to form a closed housing.

[0101] Specifically, the detection system includes a housing 1, a detection lever 7, a pulley 13, a wire rope 15, a first rack 16, a first spring 18, a first gear 2, a second gear 3, a second rack 4, a second spring 19, a photoelectric switch 5, a circuit board 20, a detection lever shaft 9, a pulley shaft 14, a second rack pressure plate 21, a first rack groove 17, and a housing cover plate 38. The housing cover plate 38 is connected to the housing 1 to form a closed housing, making the invention a closed whole. Because it uses a conventional metal cover plate without special manufacturing processes, and for ease of description, it is not described in detail. Figure 1 The photoelectric switch 5 is shown in the image. It connects to the electrical components.

[0102] Figure 2 This is a structural diagram of the housing 1 of the present invention, wherein the housing 1 is machined with a detection lever bracket 8, a pulley bracket 12, a first spring fixing post 23, a first gear shaft 24, a second gear shaft 25, a second rack groove 6, a second spring fixing post 26, a housing cover plate mounting post 22, a circuit board mounting post 40, a detection lever hole 11, an electrical compartment partition plate 28, and a mounting bracket 29. The housing cover plate 38 is connected to the housing 1 by being mounted on the housing cover plate mounting post 22.

[0103] Mounting bracket 29 is machined with mounting holes 30 (e.g., circular holes). Electrical compartment partition 28 divides the interior of housing 1 into electrical and mechanical parts, isolating the electrical parts from the mechanical components and enhancing the protection level of the electrical components. Electrical compartment partition 28 also has wiring holes 31 for guiding the photoelectric switch 5 wiring mounted in the mechanical part to the circuit board 20. The second rack groove 6 is machined at the bottom of housing 1 and is designed as a rectangular groove for easy machining and installation of the second rack 4. The base 33 of the second rack 4 is installed in the second rack groove 6 and can slide left and right along it. The second rack pressure plate 21 is initially machined as an independent component and then fixed to the bottom of housing 1 after the second rack 4 is installed. It restricts the longitudinal movement of the second rack 4, allowing it to slide left and right along the second rack groove 6 but not detach from it. The cross-section of the second rack pressure plate 21 is L-shaped; its structural diagram is shown below. Figure 4 The first rack groove 17 is a trapezoidal groove, initially machined as an independent component. After the base 33 of the first rack 16 is installed into the first rack groove 17, the first rack groove 17 is then fixed to the bottom of the housing 1. The structural diagram of the first rack groove 17 is shown below. Figure 4 The base 33 of the first rack 16 is compatible with the first rack groove 17. Figure 8 The diagram shows the structure of the first rack 16. The first rack 16 has a wire rope connecting post 32 machined at its front end, a trapezoidal base 33 machined at its bottom, and a spring pull ring 34 machined at its tail end. The wire rope connecting post 32 connects to the wire rope 15, and the spring pull ring 34 connects to the pull ring of the first rack 16. The teeth 35 of the first rack 16 are serrated. Because the base 33 of the first rack 16 is also a trapezoidal structure, after mating with the trapezoidal slide groove, the first rack 16 can only move left and right along the first rack slide groove 17 and cannot move up and down due to the restriction of the trapezoidal slide groove. The pulley bracket 12 is machined at the bottom of the housing 1, and consists of a pair of brackets. Figure 3 The DD cross-sectional view shows that the pulley bracket 12 has a pulley shaft mounting hole 3630 machined in the center of its top. The pulley shaft 14 passes through the two pulley shaft mounting holes 3630 of the pulley bracket 12 and is mounted on the pulley bracket 12. The pulley 13 is centrally mounted on the pulley shaft 14 and can rotate along the pulley shaft 14. The inspection lever bracket 8 is machined inside the front panel of the housing 1. Figure 3 The DD cross-sectional view shows that the upper part of the detection lever bracket 8 has detection lever shaft holes 10. The detection lever shaft 9 passes through two detection lever shaft holes 10 and is installed on the detection lever bracket 8. The front end of the detection lever 7 is machined into a smooth hemispherical shape to facilitate its engagement with the clamping armature 43. It has a shaft hole in the middle and a ring at the tail end. For details, see [link to specific structure]. Figure 7The detection lever 7 is centrally mounted on the detection lever shaft 9 via a coaxial hole, allowing it to rotate along the shaft and function as a lever. Figure 3 The BB cross-sectional view shows that a detection lever hole 11 is machined on the front plate of the housing 1 near the top of the detection lever bracket 8. The detection lever hole 11 is an elongated hole, and the front end of the detection lever 7 protrudes outside the housing 1 through the detection lever hole 11 to detect the displacement of the clamping armature 43. The restriction of the detection lever hole 11 allows the front end of the detection lever 7 to move up and down within a certain range, thereby transmitting the external detection movement to the transmission structure inside the invention. Both ends of the wire rope 15 are machined into rings, one end of which is connected to the tail end of the detection lever 7, and the other end is connected to the wire rope connecting post 32 of the first rack 16. Both ends of the first spring 18 are machined into pull rings, one end of which is connected to the spring pull ring 34 of the first rack 16, and the other end is connected to the first spring fixing post 23 of the housing 1. The first gear shaft 24 and the second gear shaft 25 are machined at the bottom of the housing 1. The first gear shaft 24 is machined with a first gear platform 41, and the second gear shaft 25 is machined with a second gear platform 42, as shown. Figure 3 The cross-sectional view of the first gear 2 is shown. The first gear 2 is mounted on the first gear shaft 24 and fits against the first gear platform 41. The first gear platform 41 raises the first gear 2 to a certain height, and it meshes with the first rack 16. The first gear 2 has 60 teeth, a module of 0.5, a pressure angle of 20 degrees, and a thickness of 2 mm. The second gear 3 is mounted on the second gear shaft 25 and fits against the second gear platform 42. The second gear platform 42 raises the second gear 3 to a certain height. The second gear 3 is a double-layer gear. The top layer is a 10-tooth pinion with a module of 0.5, a pressure angle of 20 degrees, and a thickness of 5 mm. The bottom layer is a large gear with 50 teeth, a module of 0.5, a pressure angle of 20 degrees, and a thickness of 2 mm. The pinion of the second gear 3 meshes with the first gear 2, and the large gear of the second gear 3 meshes with the second rack 4. The second rack 4 has a rectangular base 33, which is installed in the second rack groove 6 and can slide along the second rack groove 6. A spring pull ring 34 is machined at the tail end. The specific structural diagram of the second rack 4 is shown below. Figure 9The teeth 35 of the second rack 4 are serrated. The second spring 19 also has pull rings at both ends, and is designed to be both stretchable and compressible. The spring pull ring 34 of the second rack 4 is connected to one end of the pull ring of the second spring 19, and the other end of the pull ring of the second spring 19 is connected to the second spring fixing post 26 on the housing 1. When the second rack 4 slides to the left along the second rack groove 6, it stretches the second spring 19. When the second rack 4 disengages from the drive chain, the tension of the second spring 19 keeps the second rack 4 pressed against the second gear 3, ensuring that when the second gear 3 resets, the second rack 4 can immediately re-engage in the drive chain. When the second rack 4 slides to the right, it compresses the second spring 19. When the second rack 4 disengages from the drive chain to the right, the elasticity of the second spring 19 also keeps the second rack 4 pressed against the second gear 3, ensuring that when the second gear 3 resets, the second rack 4 can immediately re-engage in the drive chain. The photoelectric switch 5 is fixed to the front end of the second rack groove 6. When the second rack 4 slides to the left, it passes through the photoelectric switch 5, thereby blocking the light path of the photoelectric switch 5 and causing the photoelectric switch 5 to activate. The circuit board 20 is mounted on the circuit board mounting post 40 on the housing 1 and is fixed through the circuit board mounting hole 3027.

[0104] Figure 5 This is an overall assembly diagram of the invention. The clamping armature 43 has a detection lever mating hole 37 machined at its center. Figure 6 As shown, the front end of the detection lever 7 of the present invention is connected to the detection lever mating hole 37 of the clamping armature 43.

[0105] Figure 10 This is a schematic diagram of the invention. J1 is an external interface terminal, where terminals 1 and 2 are power supply terminals (pin 1 is 24VDC, pin 2 is GND), and terminals 3 and 4 are relay interface output terminals used to bring out the relay's switch contact signal. J2 is the connection terminal for photoelectric switch 5 (U2). Terminals 1 and 2 are connected to the diode of U2 (pin 1 is the diode's anode, pin 2 is GND), and terminals 3 and 4 are connected to the transistor of photoelectric switch 5 (pin 3 is connected to its collector, pin 4 is connected to its emitter). U1 is a power chip that converts 24VDC to 5VDC to drive the relay and photoelectric switch 5. When photoelectric switch 5 is not blocked, terminals 3 and 4 of U2 are conducting, shorting the base of transistor Q1 to GND, thus cutting off Q1 and preventing the relay from operating. When the photoelectric switch 5 is blocked by the second rack 4, the 3 and 4 terminals of U2 are cut off, and the base of transistor Q1 is pulled up to a high level by resistors R4 and R2. Therefore, transistor Q1 will conduct, so the relay is driven, and its contacts are connected. Then it is led out through the 3 and 4 terminals of J1.

[0106] The basic working principle of this invention is as follows.

[0107] When the clamps clamp the slab and lift it, the clamping armature 43 will slide down due to gravity. Since the clamping armature 43 engages with the front end of the detection lever 7 of the present invention through the detection lever engagement hole 37, the detection lever 7 will move down. The detection lever 7 will change direction through the detection lever shaft 9, causing the tail end of the detection lever 7 to move up. Since the tail end of the detection lever 7 is connected to the wire rope 15, the wire rope 15 will be pulled. The other end of the wire rope 15 is connected to the wire rope connecting post 32 of the first rack 16. Due to the reversing action of the pulley 13, the first rack 16 will be pulled to the left. Since the first rack 16 meshes with the first gear 2, it will drive the first gear 2 to rotate clockwise. The first gear 2 meshes with the small gear of the second gear 3, thereby driving the second gear 3 to rotate counterclockwise. The second gear 3 is a double-layer gear, and its bottom large gear meshes with the second rack 4. The counterclockwise rotation of the second gear 3 will drive the second rack 4 to move to the left. When the second rack 4 moves below the photoelectric switch 5, it blocks the light path of the photoelectric switch 5, causing the photoelectric switch 5 to activate. Its trigger signal is detected by the circuit board 20, which then triggers a relay to engage, generating a passive switch signal. This signal is led out through the J1 connection terminal of the circuit board 20 and used for detection by external devices, thereby detecting the load state of the clamping clamp. When each clamping leg is equipped with this invention, the external device can determine the clamping and load state of the slab based on the status signals of the four clamping legs. Successful clamping of the slab is only considered successful when all four clamping legs move synchronously. If asynchronous operation or incomplete operation occurs, clamping of the slab is considered a failure.

[0108] The formula for calculating the speed ratio of a gear and rack is V. 齿条 =πd 齿轮 n 齿轮 , where V 齿条 The speed of the rack movement is represented by π; π represents pi; d 齿轮 n represents the outer diameter of the gear. 齿轮 This indicates the rotational speed of the gear. Therefore, in a rack-gear-rack transmission structure, the single-layer gear in the middle does not change the speed ratio of the active and passive racks, but only changes the direction of the passive rack. Only a double-layer gear can change the speed ratio of the active and passive racks. The second gear 3 in this invention is a double-layer gear and is the only element that changes the transmission ratio of the active and passive racks in this invention. The pinion of the second gear 3 in this invention has 10 teeth, and the gear has 50 teeth, so the transmission ratio is 5 times. Therefore, the speed ratio of the first rack 16 and the second rack 4 is 1:5. Because the fulcrum of the detection lever 7 is in the center position, the transmission ratio of the lever is 1:1. The wire rope 15 also has a 1:1 transmission ratio. Therefore, the downward movement distance of the clamping armature 43 is the same as the movement distance of the first rack 16, and the movement distance of the second rack 4 is 5 times the movement distance of the clamping armature 43.

[0109] When the movement distance of the clamping armature 43 is less than or equal to 5 mm, the second rack 4 will operate within its normal working stroke. When the movement distance of the clamping armature 43 is greater than 5 mm, the second rack 4 will move to the left and disengage from the transmission chain. Excessive displacement of the clamping armature 43 will prevent the second rack 4 from moving further, thus avoiding overshoot. When the clamping armature 43 returns to its original position, the first rack 16 is pulled by the first spring 18 and also returns to its original position, while the second rack 4 is immediately engaged in the transmission chain due to the pull of the second spring 19. When the overshoot of the clamping armature 43 is too large, its reset will also cause the second rack 4 to move in the opposite direction to the right end and disengage from the transmission chain again, thus avoiding reverse overshoot. When the clamping armature 43 is fully reset, the first rack 16 will also be fully reset, and the second rack 4 will re-engage in the transmission chain due to the elasticity of the second spring 19, thus preparing for the next operation.

[0110] In this invention, motion detection can be achieved with a clamping armature 43 movement distance greater than 4 mm. However, the second rack 4 and the detection lever 7 can be redesigned to meet the requirements of different clamps, but the dimensions of the housing 1 will also need to be redesigned. Because the slabs being clamped under different working conditions include hot and cold slabs, and the temperature of hot slabs can reach several hundred degrees, if this invention is too close to the armature, the internal circuit temperature will be too high. This can be prevented by extending the external length of the detection lever 7 and adding heat insulation cotton (heat insulation layer) to the outside of this invention (housing 1 and housing cover 38). Since this invention does not have a processor, its adaptability to environmental temperature is inherently high. With proper selection, it can fully meet the environmental temperature requirement of 100 degrees. After lengthening the detection lever 7 and adding heat insulation cotton, it can adapt to high-temperature environments, thus meeting the current needs of clamps for clamping hot slabs.

[0111] To achieve detection with short strokes, adding a gear ratio mechanism to increase the detection stroke is an effective method. At the same time, to avoid overshoot during long strokes, the transmission chain needs to be broken down during long strokes to ensure that overshoot does not occur.

[0112] To achieve the above-mentioned objectives, this invention utilizes a rack-and-pinion-rack transmission mechanism to realize a 5x ratio transmission. The rack-and-pinion transmission, with an appropriate ratio, can easily achieve accurate detection for short strokes. Simultaneously, by utilizing the characteristic of the rack disengaging from the gear and thus from the transmission chain, it can buffer large strokes by disengaging from the transmission chain. During the recovery stroke, an effective method allows the rack to immediately re-engage with the transmission chain, ensuring both accurate detection for short strokes and buffering for large strokes, thus achieving stroke adaptability and effectively improving the accuracy, reliability, compatibility, and adaptability of the equipment. To ensure that the rack automatically re-engages with the transmission chain during stroke recovery, an automatic rack reset mechanism is needed. This invention achieves this function through a simple spring reset mechanism. In the event of overshoot, the passive rack pulls the spring, undergoing elastic deformation. During stroke recovery, due to the spring's action, the passive rack automatically re-engages with the transmission chain, restoring the transmission effect. When overshoot occurs during the reverse stroke, the driven rack will also disengage from the transmission chain to prevent overshoot. At the same time, it will compress the spring. When the stroke is restored, the driven rack will automatically reconnect to the transmission chain due to the elastic force of the spring, restoring the transmission effect.

[0113] This invention achieves reliable detection of the short-stroke clamping armature 43 of the slab clamp through a simple gear and rack transmission method, as well as an anti-overshoot design for the long stroke, thereby achieving reliable detection of the clamping armature 43's action and thus reliable detection of the clamp's loaded state. Since the entire invention does not use high-end sensors or expensive components, and the machining precision is not required to be too high—only the basic transmission fit of the gear and rack and the machining of the sliding groove—the overall cost can be kept very low. This invention achieves reliable detection of the loaded state of the crane clamp at a low cost, meeting the needs of intelligent and automated cranes. It also effectively meets the needs of domestic clamp manufacturers, promotes technological innovation in automated slab lifting cranes, improves the automation level of slab lifting cranes, and achieves a high degree of safety, reliability, and automation rate in automated slab clamp lifting.

[0114] This invention is a testing device capable of performing short-stroke detection without overshoot damage during long-stroke operation and meeting the requirements of high-temperature environments. It enables reliable detection of the clamp's load-bearing status, thus satisfying the needs of domestic clamp manufacturers. It also allows for technological upgrades of clamps that previously lacked load-bearing status detection equipment, enabling load-bearing detection functionality. Furthermore, it promotes technological innovation in automated slab lifting cranes, improves their automation level, and enhances the safety, reliability, and automation rate of automated slab clamp lifting.

[0115] This invention also provides a method for using a slab clamp load-bearing state detection device. The device is installed on the jaws of each clamp. When the slab is clamped and lifted, the clamping armature 43 slides down due to gravity. The clamping armature 43 engages with the armature displacement transmission mechanism, which in turn engages with the ratio transmission mechanism. This, in turn, engages with the disengagement transmission bar. When the disengagement transmission bar moves to a preset position on the transmission path, it triggers a temperature sensor, causing the sensor to activate. The electrical system detects and converts the trigger signal from the temperature sensor, using the converted signal for external detection. The external device determines the clamping load state of the slab based on the status signals from each temperature sensor. When the stroke of the clamping armature 43 is short, the ratio transmission mechanism increases the transmission stroke of the armature displacement transmission mechanism, transferring it to the disengagement transmission bar. When the stroke of the clamping armature 43 is long, the disengagement transmission bar, due to its limited length, disengages from the ratio transmission mechanism.

[0116] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0117] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A slab clamp load condition detection device, characterized in that, Includes the housing (1), mechanical parts, and electrical parts; The mechanical part includes an armature displacement transmission mechanism, a variable ratio transmission mechanism, a pre-length disengagement transmission bar, and a temperature sensor. The armature displacement transmission mechanism is connected to the clamping armature (43) in a transmission connection; The variable ratio transmission mechanism is respectively connected to the armature displacement transmission mechanism and the disengagement transmission bar of a preset length; The variable ratio transmission mechanism is used to increase the transmission stroke of the armature displacement transmission mechanism and transfer it to the disengagement transmission bar. The temperature sensor is fixed inside the housing (1), and the temperature sensor is connected to the disengagement transmission bar at the preset position of the transmission route. The temperature sensor is connected to the electrical components; The electrical components are used to connect to external devices, detect and convert the trigger signal of the temperature resistance sensor, and use the converted signal for detection by the external devices. The temperature-resistant sensor is a photoelectric switch (5); The variable ratio transmission mechanism includes a first transmission wheel and a second transmission wheel; The first transmission wheel and the second transmission wheel are respectively rotatably disposed inside the housing (1); The second transmission wheel includes a large transmission wheel and a small transmission wheel fixed on the same axis, and the circumference of the first transmission wheel and the large transmission wheel is greater than the circumference of the small transmission wheel; The first transmission wheel is connected to the armature displacement transmission mechanism. The first transmission wheel and the small transmission wheel are connected by a transmission connection; The large transmission wheel is meshed with the second rack. The disengaged transmission bar is a second rack; The armature displacement transmission mechanism includes a lever transmission assembly, a steering transmission assembly, and a connecting transmission assembly; The lever transmission assembly is connected to the clamping armature (43) in a transmission connection; The lever transmission assembly is connected to the steering transmission assembly. The steering transmission assembly is connected to the connecting transmission assembly in a transmission connection. The connecting transmission assembly is connected to the first transmission wheel; The lever transmission assembly includes a detection lever (7), a detection lever bracket (8), and a detection lever shaft (9). The detection lever bracket (8) is fixedly installed inside the housing (1); The detection lever shaft (9) is mounted on the detection lever bracket (8); The detection lever (7) is rotatably mounted on the detection lever shaft (9); The housing (1) is provided with a detection lever hole (11); One end of the detection lever (7) is movably passed through the detection lever hole (11) and is connected to the clamping armature (43) for transmission. The other end of the detection lever (7) is connected to the steering transmission assembly; When the second rack (4) moves below the photoelectric switch (5), it will block the light path of the photoelectric switch (5), thereby causing the photoelectric switch (5) to activate.

2. The slab clamp load condition detection device according to claim 1, characterized in that, The electrical and mechanical parts are respectively housed within the housing (1); The housing (1) is provided with an electrical compartment partition (28) that separates the electrical parts from the mechanical parts. The electrical compartment partition (28) is provided with a wire hole (31); The temperature sensor is connected to the electrical components via a connecting wire; The connecting wire is threaded through a wire hole (31).

3. The slab clamp load condition detection device according to claim 1, characterized in that, The mechanical part also includes a reset mechanism for resetting the armature displacement transmission mechanism and the disengagement transmission bar; The reset mechanism includes a first elastic element and a second elastic element; One end of the first elastic element is connected to the armature displacement transmission mechanism, and the other end of the first elastic element is fixed inside the housing (1); One end of the second elastic element is disengaged from the transmission bar, and the other end of the second elastic element is fixed inside the housing (1).

4. The slab clamp load condition detection device according to claim 1, characterized in that, The housing (1) is provided with a disengagement transmission groove for limiting the disengagement transmission bar; The disengagement transmission bar slides out of the transmission groove.

5. The slab clamp load condition detection device according to claim 1, characterized in that, The connecting transmission assembly includes a connecting transmission bar and a connecting transmission groove for limiting the position of the connecting transmission bar. The connecting transmission bar is connected to the steering transmission assembly in a transmission connection; The connecting transmission bar is connected to the first transmission wheel; The connecting transmission groove is disposed inside the housing (1); The connecting transmission bar is slidably connected to the connecting transmission groove.

6. The slab clamp load condition detection device according to claim 1, characterized in that, The testing equipment also includes a housing cover plate (38); The shell cover plate (38) is fitted to the shell (1) to form a closed shell.

7. A method for using a slab clamp load condition detection device, characterized in that, The slab clamp load-bearing state detection device according to any one of claims 1-6 is installed on the jaws of each clamp. When the slab is clamped by the clamp and then lifted, the clamping armature (43) slides down due to gravity. The clamping armature (43) is driven by the armature displacement transmission mechanism. The armature displacement transmission mechanism is driven by the ratio transmission mechanism. Then the armature displacement transmission mechanism is driven by the disengagement transmission bar. When the disengagement transmission bar moves to the preset position of the transmission route, the disengagement transmission bar triggers the temperature sensor, so that the temperature sensor is activated. The electrical part detects the trigger signal of the temperature sensor and converts it. The converted signal is used for detection by the external equipment. The external equipment determines the clamping load-bearing state of the slab based on the status signal of each temperature sensor detected. When the stroke of clamping armature (43) is small, the ratio transmission mechanism increases the transmission stroke of the armature displacement transmission mechanism and converts it to disengagement from the transmission bar. When the stroke of the clamping armature (43) is large, the disengagement transmission bar, due to its limited length, disengages from the transmission mechanism.

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