A suspended large mass comparator

Abstract

The invention is a kind of suspension type large mass comparator, which belongs to the field of mass comparator. The appearance is cylindrical, and is hung on the crane by three claw hangers, which can be adjusted horizontally. The inner wall of the cylinder is supported by a ring type sensor support plate, and the bottom is provided with a bottom plate for mounting a servo cylinder. A sensor pressing plate is arranged above the sensor, and a connecting rod is arranged at the center of the pressing plate. The connecting rod is connected to a pull rod through a clutch assembly, and the lower end of the pull rod is connected to a weight lifting ring. The sensor and the servo cylinder are arranged alternately, and a top plate sinking barrel is arranged in the middle of the top plate of the servo cylinder. A concave spherical saddle is arranged in the barrel to lift the pull rod. The servo cylinder can separate and connect the clutch assembly, and present two states of whether the measurement system is stressed or not. The lifting and measurement can be carried out step by step. The comparator has the following repeatability conditions for comparison and measurement: 1. The horizontal state is unchanged, 2. The loading speed is constant and slow during measurement, and the impact force is consistent, 3. The sensor is in a large circle, and the tension point is in the center, which eliminates the eccentric load. It can meet the requirements of M grade large weight transmission accuracy.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mass comparators, and particularly relates to a suspended large mass comparator. BACKGROUND

[0002] Mass comparison instruments are widely used for detection and transmission of weights. For M-grade large mass weights, the maximum value of the measurement range can reach 500 kg, 1 t, 2 t, and the actual graduation value can reach 2 g, 5 g, 10 g order of magnitude. Due to the large measurement range and high precision requirement, a platform mass comparator placed on the ground is usually selected. When detecting the weight, a lifting device is used to place the standard weight, the weight to be detected, and the standard weight on the comparator in turn to read the measurement result. In order to avoid the impact of the weight on the comparator affecting the measurement result, the loading must be slow, the loading and measuring time interval should be consistent as much as possible, and in order to obtain accurate measurement results, the detection personnel need to assist to load the weight to the center of the comparator platform as much as possible to reduce the partial load. Although the measurement accuracy of the platform mass comparator can meet the requirements, according to the requirements of the national metrological verification regulation, when detecting a weight, the weight to be detected needs to be measured once, and the standard weight needs to be measured twice. Every time a weight is measured, the weight needs to be lifted, placed on the comparator, and then lifted and moved away. When detecting a weight, the weight is lifted six times and placed three times. The whole process of lifting and placing the weight is frequent, and the efficiency is low. The personnel participation degree is high during detection. If the operation is not standardized, the impact force and position partial load of the placed weight will lead to the introduction of human measurement error. In addition, the impact force of the placed weight during the detection process is also easy to damage the comparator.

[0003] Platform type mass comparator must have crane as auxiliary equipment to cooperate loading when detecting large mass weight, and the crane is required to be higher, preferably variable frequency crane, the speed is very slow, and the weight is detected by the personnel with careful cooperation when lifting and placing the weight, the labor intensity is large, and the time is long, so the weight detection personnel very much hopes that the hook scale type large mass comparator can meet the detection needs of large mass weight, and the hook scale type mass comparator is hung on the crane hook during detection, which is directly used, and the step of placing the weight on the platform is saved, and the weight is lifted for measurement without moving. Therefore, relevant attempts have been made by researchers, and the scheme is that a high-precision tension sensor and a high-precision instrument are combined to form a weighing system, the upper end is hung on the crane hook during detection, and the lower end is hung on the weight, and the step of placing the weight on the platform is saved after lifting. However, the technical scheme of only demanding the precision of the sensor and the instrument cannot make the hook type mass comparator meet the detection precision requirements of large mass weight, and the reason is that such a structure cannot cope with the problems caused by the working conditions: the comparator is a high-precision measuring instrument, and the difference between two weights with the same nominal mass is very small, so the repeatability measurement conditions must be met during two measurements, that is, the conditions are consistent when the standard weight and the detected weight are measured. These conditions include the impact force during loading, the horizontal state of the comparator, the unbalanced state of the lifted weight relative to the measurement system, and the influence of the lateral force of the weight swing on the measurement system. If any of these conditions is not met, the difference obtained by two measurements is several times or even dozens of times of the actual difference between the detected weight and the standard weight. In summary, the hook scale type mass comparator cannot meet the repeatability measurement conditions due to the problems caused by the working conditions, and therefore cannot meet the requirements of the national metrological verification regulation, so there is no hook scale type large mass comparator that can be applied to actual weight detection work. In order to realize the detection of large mass weight by the hook scale type large mass comparator, in addition to using high-precision sensors and instruments as the platform type mass comparator, the key is to create good repeatability measurement conditions by special structure design according to the problems caused by the actual working conditions. SUMMARY

[0004] The purpose of the present application is to provide a suspension type large mass comparator, which can ensure the consistency of the impact force during loading, keep the horizontal state of the comparator unchanged, eliminate the unbalanced state of the lifted weight relative to the measurement system, and avoid the influence of the lateral force of the weight swing on the measurement system, so that the measurement accuracy of the suspension type large mass comparator is guaranteed, and the suspension type large mass comparator can be used for detection of M grade large mass weight.

[0005] The technical problem solved by the present application can be realized by the following scheme: a suspension type large mass comparator, comprising a barrel, a sensor support plate fixedly installed on the inner wall of the barrel, a sensor fixedly installed on the sensor support plate, a sensor cover plate arranged above the sensor and capable of pressing on the sensor, a cylinder body of a servo cylinder installed below the sensor support plate, the bottom of the cylinder body being fixed on a barrel bottom plate, the barrel bottom plate being fixedly installed on the inner wall of the barrel, a lead screw arranged on the upper end of the cylinder body, the upper end of the lead screw penetrating through the sensor support plate and being fixed on the bottom of a servo cylinder top plate, the servo cylinder top plate being located between the sensor cover plate and the sensor support plate, a pull rod penetrating through the center of the servo cylinder top plate, the upper end of the pull rod being fixedly connected with a clutch assembly pressure head, the lower end of the pull rod being connected with a lifting ring for lifting a weight, a pull rod spherical lifting head capable of pressing on the servo cylinder top plate being fixedly installed below the clutch assembly pressure head of the pull rod, a connecting rod penetrating through the center of the sensor cover plate, the upper end of the connecting rod being fixedly connected with a connecting rod spherical pull head for pressing on the sensor cover plate, the lower end of the connecting rod being fixedly installed with a clutch assembly saddle, the pull rod and the connecting rod being capable of being separated and connected through the clutch assembly saddle matched with the clutch assembly pressure head.

[0006] When the lead screw of the servo cylinder is raised, the pull rod spherical lifting head and the pull rod are pushed to rise, thereby driving the clutch assembly pressure head of the pull rod to rise and separate from the clutch assembly saddle; when the lead screw of the servo cylinder is retracted, the pull rod spherical lifting head and the pull rod lose the lifting and are lowered under the action of their own gravity and the gravity of the weight, thereby the clutch assembly pressure head of the pull rod is lowered and connected with the clutch assembly saddle.

[0007] Further, the clutch assembly saddle is a hollow cavity with a bottom hole, the upper end of the pull rod penetrates into the hollow part of the clutch assembly saddle from the bottom hole of the clutch assembly saddle, and the clutch assembly pressure head of the pull rod can be pressed on the bottom of the hollow part of the clutch assembly saddle; the lower end of the clutch assembly pressure head is in the shape of an inverted cone, and the part connected with the clutch assembly saddle is in the shape of a tapered hole; the clutch assembly pressure head and the pull rod are fixedly connected through threads.

[0008] Further, a lifting concave spherical saddle is fixedly installed in the top plate sinking barrel of the servo cylinder top plate, the pull rod spherical lifting head is in the shape of a spherical surface matched with the lifting concave spherical saddle, and the pull rod spherical lifting head can press on the lifting concave spherical saddle; the lifting concave spherical saddle is located below the clutch assembly saddle, the clutch assembly saddle is located in the top plate sinking barrel arranged on the servo cylinder, and does not contact, the top plate sinking barrel and the servo cylinder top plate are integrally arranged, and the lifting concave spherical saddle is provided with a through hole penetrating the pull rod.

[0009] Further, the sensor cover plate is fixedly installed with a cover plate concave spherical saddle, the connecting rod spherical pull head is in spherical shape matched with the cover plate concave spherical saddle, and the connecting rod spherical pull head can be pressed on the cover plate concave spherical saddle; the connecting rod and the clutch assembly saddle are fixedly connected through threads.

[0010] Further, the center of the cylinder bottom plate is fixedly installed with a guide positioning seat, a tapered hole is formed in the guide positioning seat, and a guide positioning block is fixedly installed on the pull rod above the lifting ring and matched with and embedded in the tapered hole of the guide positioning seat.

[0011] Further, the sensor support plate is provided with three sensors equidistantly arranged in the circumferential direction, the cylinder bottom plate is provided with three servo cylinders equidistantly arranged in the circumferential direction, and the three servo cylinders and the three sensors are alternately arranged; the central angle between adjacent servo cylinders and sensors is 60°, and the central angle between adjacent sensors is 120°; the servo cylinder top plate and the sensor cover plate are designed in a triangular star shape, and the sensor support plate is designed in a circular ring shape, which can reduce the weight of the device, facilitate the installation and maintenance of the components, and facilitate the carrying of the device to the site.

[0012] Further, each servo cylinder is provided with a power unit for driving the screw action of the servo cylinder.

[0013] Further, the cylinder body is fixedly installed with a display instrument connected with the sensor and a PLC controller connected with the power unit.

[0014] Further, a reinforcing ring is welded to the top outer edge of the cylinder body, three hanging rings are equidistantly installed on the reinforcing ring, and three handles are uniformly arranged outside the cylinder body, and the three handles and the three hanging rings are connected one by one.

[0015] Further, the three hanging rings on the cylinder body are connected with a three-jaw lifting device, the three-jaw lifting device comprises a rotating lifting ring, a lifting ring seat and a closed body basket, the rotating lifting ring is installed on the lifting ring seat, three positioning pins are uniformly arranged on the lifting ring seat, and three closed body baskets are provided, the length of the closed body basket can be adjusted, and the upper end of the closed body basket is connected with the positioning pins on the lifting ring seat, and the lower end is connected with the hanging rings on the reinforcing ring.

[0016] The working principle of the suspension type large mass comparator in detecting the weight is as follows: first, the standard weight is hoisted for measurement; after the standard weight is removed, the detected weight is hoisted for measurement, and after the measurement is completed, the detected weight is removed, and the standard weight is hoisted again for measurement. The measurement value of the detected weight minus the average value of the measurement values of the standard weight before and after the measurement to obtain the difference between the detected weight and the standard weight.

[0017] The method and advantages are as follows: when the suspension type large mass comparator detects the weight, the suspension type large mass comparator is hung on the lifting hook of the crane, the servo cylinder is first started, the screw rod of the servo cylinder is lifted to drive the spherical lifting head of the pull rod and the pull rod to rise, and then the clutch assembly pressure head of the pull rod is lifted to separate from the clutch assembly saddle. In this state, the crane is started again to suspend the weight on the lifting ring at the lower end of the pull rod of the mass comparator. Since the clutch assembly pressure head of the pull rod is in a separated state from the clutch assembly saddle, the pull rod connected to the clutch assembly saddle through the connecting rod is in a separated state from the connecting rod at this time, and the weight suspended below the pull rod cannot transmit the tension applied to the pull rod to the connecting rod, nor can it convert the tension into pressure through the connecting rod pull head on the connecting rod to apply to the sensor cover plate. At this time, the sensor is in a state of not bearing the pressure formed by the weight. Therefore, the impact force generated by the crane lifting speed uncontrollability at the moment of lifting is borne by the servo cylinder connected to the pull rod through the screw rod of the servo cylinder, and will not be borne by the measurement system for detecting the weight of the weight; the lateral force formed by the swing of the weight at the moment of lifting and after the crane moves will also be borne by the servo cylinder, and will not act on the measurement system for detecting the weight of the weight.

[0018] After the crane moves the weight to the measurement position, the detection personnel can apply external force intervention to make the suspension type large mass comparator stop swinging as soon as possible (small amplitude swing is inevitable), at this time, the measurement stage is entered, the servo cylinder is started, the screw rod of the servo cylinder is retracted to make the spherical lifting head of the pull rod and the pull rod descend, and then the clutch assembly pressure head of the pull rod is lowered to connect with the clutch assembly saddle. The connection between the clutch assembly pressure head and the clutch assembly saddle makes the pull rod and the connecting rod in a connected state, the weight suspended below the pull rod transmits the tension applied to the pull rod to the connecting rod through the clutch assembly saddle, the tension transmitted to the connecting rod is converted into pressure through the connecting rod pull head to apply to the sensor cover plate, the sensor bears the pressure applied by the sensor cover plate through the connecting rod pull head, and the weight is measured by measuring the pressure applied thereto. In the measurement stage, the weight swings slightly, and since the sensor is not arranged on the pull rod for hoisting the weight and the connecting rod connected to the pull rod, the sensor will not swing with the weight.

[0019] The suspension type large mass comparator of the present application isolates the hoisting and moving stage of the weight and the measuring stage of the weight, the sensor does not measure in the hoisting and moving stage, the impact force generated in the hoisting and moving stage does not act on the sensor, and the swing of the weight does not affect the sensor. In the measuring stage, the sensor does not swing with the weight, and the swing of the weight does not generate lateral force on the sensor. The suspension type large mass comparator of the present application overcomes the influence of impact and swing in the hoisting, moving and measuring process on the sensor, reduces the bias error of the measurement, ensures the repeatability condition of the measurement, and improves the accuracy of the weight detection, and is suitable for the detection of large mass weights with high precision requirements. Compared with the platform type mass comparator, the suspension type large mass comparator of the present application can complete a measurement after hoisting, and the process of placing the weight on the platform is omitted, the detection process is simple and efficient, the degree of personnel participation is reduced, human measurement error can be avoided, and the phenomenon of loading too hard to damage the mass comparator does not occur.

[0020] The suspension type large mass comparator has five sufficient conditions for accurate measurement: (1) The three-jaw lifting appliance designed in the present application can pre-adjust the suspension type large mass comparator to be in a horizontal state, the three contact points of the three-jaw lifting appliance are uniformly distributed on the circumference, and the gravity point is at the center of the circle, so that the horizontal state repeatability condition during use can be ensured. (2) When the crane moves after hoisting the weight and lifting the weight, the clutch assembly of the suspension type large mass comparator is in a separated state, the uncontrolled impact force during hoisting and the lateral force caused by the swing of the weight during the movement of the trolley will not act on the measurement system, and the extension and retraction speed of the servo cylinder controlling the clutch assembly is the same and slow each time, effectively controlling the impact of the loaded weight on the measurement system, and providing the repeatability condition of the loading force. (3) The spherical lifting head of the pull rod will automatically reset under the action of the weight gravity, the taper hole cooperation of the guide positioning block and the guide positioning seat, and the cooperation of the pull rod clutch assembly pressure head and the clutch assembly saddle can ensure that the position of the pull rod lifting and falling remains consistent, and the repeatability condition of the contact point position is ensured. (4) The sensor is installed on a larger circumference, and the tension point is at the center of the circle, which can maximize the elimination of the bias load, and ensure the repeatability condition of the bias load. (5) The spherical pull head of the connecting rod can swing in the concave spherical saddle of the cover plate, and can eliminate the lateral force caused by the small swing of the weight during measurement (the small swing during measurement is inevitable). The entire design ensures the repeatability condition of the comparison measurement according to the use condition characteristics, and can ensure that the suspension type large mass comparator has the same measurement accuracy as the platform type comparator, and meets the needs of M grade large mass weight transmission. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without any creative effort.

[0022] Figure 1 is the external structure diagram of the suspension type large mass comparator of the present application;

[0023] Figure 2 is the sectional view of the suspension type large mass comparator of the present application, and the clutch assembly is in the separated state;

[0024] Figure 3 is the sectional view of the suspension type large mass comparator of the present application, and the clutch assembly is in the adhered state;

[0025] Figure 4 is the schematic diagram of the internal structure of the suspension type large mass comparator of the present application;

[0026] Figure 5 is the 3 / 4 sectional view of the suspension type large mass comparator of the present application;

[0027] Figure 6 is the schematic diagram of the sensor cover plate of the suspension type large mass comparator of the present application;

[0028] Main marks and labels:

[0029] Cylinder: 1; cylinder wall: 11; cylinder cover: 12; cylinder bottom plate: 13;

[0030] Sensor: 2; sensor support plate: 21; sensor cover plate: 22; cover plate concave spherical saddle: 221;

[0031] Servo electric cylinder: 3; cylinder body: 31; lead screw: 32; power unit: 33; servo electric cylinder top plate 321; top plate sinking barrel: 322; lifting concave spherical saddle: 3221;

[0032] Connecting rod: 4; connecting rod spherical pull head: 41;

[0033] Pull rod: 5; pull rod spherical lifting head: 51; guide positioning block: 52; lifting ring: 53;

[0034] Clutch assembly saddle: 61; clutch assembly pressing head: 62;

[0035] Guide positioning seat: 7;

[0036] PLC controller: 81; display instrument: 82;

[0037] Hanging ring base: 91; Closed flower basket: 92; Hanging ring: 93; Handle: 94; Positioning pin: 95; Reinforcing ring: 96; Rotating hanging ring: 97. Detailed Implementation

[0038] To make the objectives, technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0039] Example

[0040] Figures 1-6 This is a structural diagram of a suspended large-mass comparator according to this embodiment, as shown below. Figure 1 As shown, the suspended large mass comparator includes a cylindrical body 1, which is cylindrical in shape, such as... Figures 2-5 As shown, a sensor support plate 21 is fixedly installed on the upper middle part of the inner wall of the cylinder 1. A sensor 2 is fixedly installed on the sensor support plate 21. In this embodiment, the sensor 2 is a pressure S-shaped sensor, such as a C6 grade pressure sensor. A sensor cover plate 22 is provided above the sensor 2, pressing on the sensor 2. The cylinder body 31 of the servo cylinder 3 is installed below the sensor support plate 21. The servo cylinder 3 is a servo cylinder, including a cylinder body 31 and a lead screw 32. The bottom of the cylinder body 31 is fixed on the bottom plate 13 of the cylinder. The bottom plate 13 is fixedly installed on the inner wall of the cylinder 1, located in the middle of the inner wall of the cylinder 1. A lead screw 32 is provided at the upper end of the cylinder body 31. The upper end of the lead screw 32 passes through the sensor support plate 21 and is fixed to the bottom of the servo cylinder top plate 321. The servo cylinder top plate 321 is located between the sensor cover plate 22 and the sensor support plate 21. A lifting concave spherical saddle 3221 is fixedly installed in the sinker 322 under the top plate of the servo cylinder top plate 321. The extension and retraction of the lead screw 32 realizes the lifting and lowering action of the concave spherical saddle 3221. A pull rod 5 is inserted through the center of the servo cylinder top plate 321. The upper end of the pull rod 5 is fixedly connected to the clutch assembly pressure head 62, and the lower end is connected to the lifting ring 53 for lifting weights. A pull rod spherical lifting head 51 that can press against the concave spherical saddle 3221 of the sinker 322 under the top plate is fixedly installed below the clutch assembly pressure head 62. A connecting rod 4 is inserted through the sensor cover plate 22. The upper end of the connecting rod 4 is fixedly connected to a connecting rod spherical pull head 41 that presses against the sensor cover plate 22. The connecting rod spherical pull head 41 can apply a pulling force to the sensor cover plate 22 through the cover plate concave spherical saddle 221 fixedly installed on the sensor cover plate 22. The lower end of the connecting rod 4 is fixedly installed with a clutch assembly saddle 61. The clutch assembly pressure head 62 of the pull rod 5 can connect or separate from the clutch assembly saddle 61, thereby connecting or separating the pull rod 5 from the connecting rod 4. In this embodiment, the clutch assembly pressure head 62 and the clutch assembly saddle 61 together constitute the clutch assembly.

[0041] When the screw rod 32 of the servo cylinder 3 is lifted, the pull rod spherical lifting head 51 and the pull rod 5 are pushed up, and then the clutch assembly pressure head 62 of the pull rod 5 is lifted to separate from the clutch assembly saddle 61, at this time, the pull rod 5 and the connecting rod 4 are in a separated state, the tension applied to the pull rod 5 by the weight hung on the lifting ring 53 cannot be transmitted to the connecting rod 4 through the clutch assembly saddle 61, and then the tension cannot be converted into pressure by the connecting rod spherical pull head 41 to be transmitted to the sensor cover plate 22, the sensor 2 does not bear the pressure applied by the sensor cover plate 22 through the connecting rod spherical pull head 41, so the sensor 2 is in a state of not bearing tension. When the screw rod 32 of the servo cylinder 3 is retracted, the lifting concave spherical saddle 3221 is lowered, the pull rod spherical lifting head 51 and the pull rod 5 lose the lifting and are lowered under the action of their own gravity and the weight of the weight, and then the clutch assembly pressure head 62 of the pull rod 5 is lowered to be connected with the clutch assembly saddle 61, at this time, the pull rod 5 and the connecting rod 4 are in a connected state, the tension applied to the pull rod 5 by the weight hung on the lifting ring 53 is transmitted to the connecting rod 4 through the clutch assembly, and then the tension is converted into pressure by the connecting rod spherical pull head 41 to be transmitted to the sensor cover plate 22, the sensor 2 bears the pressure applied by the sensor cover plate 22 through the connecting rod spherical pull head 41, this state is a complete measurement state, and the mass of the weight can be measured.

[0042] When the weight is detected, the suspension large mass comparator is hung on the lifting hook of the crane, the servo cylinder 3 is started before lifting the weight, the screw rod 32 of the servo cylinder 3 is lifted to push the pull rod spherical lifting head 51 and the pull rod 5 up, and then the clutch assembly pressure head 62 of the pull rod 5 is lifted to separate from the clutch assembly saddle 61, in this state, the crane is started again to hang the weight on the lifting ring 53 at the lower end of the pull rod 5 of the mass comparator, because the clutch assembly pressure head 62 of the pull rod 5 is in a separated state from the clutch assembly saddle 61, the weight hung below the pull rod 5 cannot transmit the tension applied to the pull rod 5 to the connecting rod 4, and the tension cannot be converted into pressure by the connecting rod spherical pull head 41 to be applied to the sensor cover plate 22, the sensor 2 does not bear the pressure applied by the sensor cover plate 22 through the connecting rod spherical pull head 41, at this time, the sensor 2 is in a state of not bearing the tension of the weight. Therefore, the impact force generated by the uncontrolled lifting speed of the crane at the moment of lifting is borne by the servo cylinder 3 connected with the pull rod 5 through the screw rod 32 of the servo cylinder 3, and will not be borne by the sensor 2 for detecting the mass of the weight; the lateral force formed by the swing of the weight at the moment of lifting and after lifting will also be borne by the servo cylinder 3, and will not act on the sensor 2 for detecting the mass of the weight.

[0043] After the crane moves the weight to the measuring position, in order to speed up the measurement, the weight can be manually intervened to make it stationary, at this time the measurement stage is entered, the servo cylinder 3 is started, the lead screw 32 of the servo cylinder 3 is retracted, driving the lifting concave spherical saddle 3221 to descend, the pull rod spherical lifting head 51 and the pull rod 5 lose lifting, the pull rod 5 descends under the action of its own and the weight of the weight, the clutch assembly pressure head 62 of the pull rod 5 descends and is connected with the clutch assembly saddle 61, through the connection between the clutch assembly pressure head 62 and the clutch assembly saddle 61 of the pull rod 5, the pull rod 5 and the connecting rod 4 are in a connected state, the weight suspended below the pull rod 5 will transmit the tension on the pull rod 5 to the connecting rod 4 through the clutch assembly saddle 61, the tension transmitted to the connecting rod 4 is converted into pressure by the connecting rod spherical pull head 41 and applied to the sensor cover plate 22, the sensor 2 bears the pressure applied by the sensor cover plate 22 through the connecting rod spherical pull head 41, and the weight is measured by measuring the pressure applied thereto. If the weight swings slightly during the measurement stage, because the connecting rod spherical pull head 41 can rotate freely in the cover plate concave spherical saddle 221, the lateral force of the weight swing will not be transmitted to the sensor 2, and the measurement system is not affected by the lateral force (the measurement system of the embodiment includes the sensor 2, the sensor cover plate 22, the cover plate concave spherical saddle 221, the connecting rod 4, and the connecting rod spherical pull head 41). The sensor 2 is indirectly connected with the weight and can bear the entire weight of the weight, but will not swing with the weight, thereby increasing the stability of the measurement system.

[0044] For the structure of the barrel 1, further, as shown in Figure 1 The barrel 1 includes a barrel wall 11 and a barrel cover 12 capable of being covered on the barrel wall 11. Further, the barrel cover 12 is detachably fixedly installed on the barrel wall 11 by bolts. As shown in Figures 2-5 The sensor support plate 21 is fixedly installed on the inner wall of the barrel wall 11. For the sensor cover plate 22, further, a sensor pressure head groove is arranged at a position corresponding to the sensor 2 below the sensor cover plate 22, so as to press the sensor cover plate 22 on the pressure head of the sensor 2, and the position is unchanged.

[0045] In order to load the weight on the center of the mass comparator to ensure the accuracy of the measurement result, further, three sensors 2 are arranged on the sensor support plate 21 at equal intervals in the circumferential direction, three servo cylinders 3 are arranged at equal intervals on the larger circumference of the barrel bottom plate 13, and the three servo cylinders 3 and the three sensors 2 are arranged alternately; the central angle between adjacent servo cylinders 3 and sensors 2 is 60°, and the central angle between adjacent sensors 2 and sensors 2 is 120°; the shapes of the servo cylinder top plate 321 and the sensor cover plate 22 are designed as a triangular star, and the shape of the sensor support plate 21 is designed as a circular ring, which can reduce the weight of the device, reduce the weight of the device, facilitate carrying to the scene, and facilitate the installation and maintenance of each part. The circular design of the sensor support plate 21 also facilitates the passage of the sinking barrel 61 from the ring.

[0046] In order to eliminate the influence of the eccentric load on the measurement result, further, the sensor support plate 211 is taken as the center, and three sensors 2 are arranged at equal intervals in the circumferential direction in the embodiment, and one sensor 2 is installed every 120 degrees. Since the pull rod 5 passes through the center of the sensor support plate 21, the tension point formed by the weight is located on the center of the circumference of the three sensors 2, and the gravity line of the hoisted weight passes through the center and is perpendicular to the plane of the three sensors 2, which can well eliminate the influence of the eccentric load on the measurement result and ensure the repeatability condition. In order to further eliminate the influence of the eccentric load, further, the sensitivities of the three sensors 2 are the same.

[0047] As for the specific structure of the servo cylinder 3, the servo cylinder 3 in the embodiment adopts the existing servo cylinder. In order to drive the servo cylinder 3 to act, further, a power unit 33 for driving the screw 32 of the servo cylinder 3 to act is installed on the outer wall of the cylinder body 31 of the servo cylinder 3, and the power unit 33 is a servo motor in the embodiment. The servo cylinder 3 in the embodiment can load the hoisted weight onto the sensor 2 at a constant speed, and the loading speed is controllable and consistent each time, which ensures the consistent repeatability condition of the impact force on the sensor 2 each time, and further eliminates the impact of the impact on the sensor 2.

[0048] In order to further eliminate the influence of the swing of the weight on the sensor 2, further, as shown in Figures 2-5As shown, the center of the top plate 321 of the servo cylinder is integrally provided with a top plate sinking barrel 322, and the lower center of the top plate sinking barrel 322 is fixedly installed with a lifting concave spherical saddle 3221. The pull rod spherical lifting head 51 is in a spherical shape matching the lifting concave spherical saddle 3221, and can be pressed on the lifting concave spherical saddle 3221. The lifting concave spherical saddle 3221 is below the clutch assembly saddle 61, and the clutch assembly saddle 61 is in the top plate sinking barrel 322 on the servo cylinder top plate 321 and does not contact. The lifting concave spherical saddle 3221 is provided with a through hole for the pull rod 5, and the top plate sinking barrel 322 is integrally provided with the servo cylinder top plate 321. The design of the top plate sinking barrel 322 can better utilize the internal space of the cylinder body 1, and the pull rod spherical lifting head 51 is pressed on the lead screw 32 of the servo cylinder 3 by pressing on the lifting concave spherical saddle 3221. Further, the pull rod spherical lifting head 51 in a spherical shape has the same curvature as the lifting concave spherical saddle 3221, and can be embedded in the lifting concave spherical saddle 3221 and can swing in the lifting concave spherical saddle 3221. During lifting and moving, the cooperation of the pull rod spherical lifting head 51 in a spherical shape and the lifting concave spherical saddle 3221 ensures consistent loading position under the action of gravity.

[0049] Further, in order to eliminate the influence of the swing of the weight on the sensor 2 during measurement, as shown in the drawings, Figures 2-5 As shown, the sensor cover plate 22 is fixedly installed with a cover plate concave spherical saddle 221, and the connecting rod spherical pull head 41 is in a spherical shape matching the cover plate concave spherical saddle 221, and can be pressed on the cover plate concave spherical saddle 221. The connecting rod spherical pull head 41 is pressed on the sensor cover plate 22 by pressing on the cover plate concave spherical saddle 221. Further, the connecting rod spherical pull head 41 in a spherical shape has the same curvature as the cover plate concave spherical saddle 221, and can be embedded in the cover plate concave spherical saddle 221 and can swing in the cover plate concave spherical saddle 221. Further, the cover plate concave spherical saddle 221 is fixedly installed at the center of the sensor cover plate 22. During measurement, the cooperation of the connecting rod spherical pull head 41 in a spherical shape and the cover plate concave spherical saddle 221 ensures consistent loading position under the action of gravity of the weight, and can effectively overcome the lateral force formed by the small swing of the weight during measurement, avoiding the transmission of the lateral force to the sensor 2. The structure design of the connecting rod spherical pull head 41 in a spherical shape and the cover plate concave spherical saddle 221 can eliminate the influence of the lateral force of the small swing of the weight on the sensor 2 in 360-degree direction.

[0050] Further, the connecting rod 4 and the clutch assembly saddle 61 are connected by threads and can be removed for maintenance. The cover plate concave spherical saddle 221 is provided with a through hole for the connecting rod 4, which facilitates the removal and maintenance of the connecting rod 4 and the clutch assembly saddle 61.

[0051] To achieve the connection and disengagement between the clutch assembly pressure head 62 of the pull rod 5 and the clutch assembly saddle 61, further, such as Figures 2-5 As shown, the clutch assembly saddle 61 is a hollow cavity. The upper end of the pull rod 5 passes through the hollow part of the clutch assembly saddle 61, and the clutch assembly pressure head 62 of the pull rod 5 is located inside the hollow part of the clutch assembly saddle 61 and can press against the bottom of the hollow part of the clutch assembly saddle 61. The clutch assembly pressure head 62 of the pull rod 5 can apply pressure to the clutch assembly saddle 61 by pressing against the bottom of the clutch assembly saddle 61. Furthermore, the lower end of the connecting rod 4 is fixedly connected to the solid part of the upper end of the clutch assembly saddle 61. When the lead screw 32 of the servo electric cylinder 3 rises, driving the clutch assembly pressure head 62 of the pull rod 5 to rise, the clutch assembly pressure head 62 separates from the bottom of the clutch assembly saddle 61, causing the pull rod 5 to separate from the connecting rod 4. When the lead screw 32 of the servo cylinder 3 retracts, causing the clutch assembly pressure head 62 of the pull rod 5 to descend, the clutch assembly pressure head 62 presses against the bottom of the clutch assembly saddle 61, thus connecting the pull rod 5 to the connecting rod 4. Furthermore, to ensure that the clutch assembly pressure head 62 remains in the same position after each rise and fall, the lower end of the clutch assembly pressure head 62 is shaped like an inverted cone, and the part of the clutch assembly saddle 61 connected to it is configured as a tapered hole; the clutch assembly pressure head 62 and the pull rod 5 are detachably fixedly connected by threads.

[0052] To further eliminate the influence of weight swaying, a guide positioning seat 7 is fixedly installed at the center of the bottom plate 13. The guide positioning seat 7 has a conical hole. A guide positioning block 52, which matches and can be inserted into the conical hole of the guide positioning seat 7, is fixedly installed on the pull rod 5 above the lifting ring 53. During the lifting and moving phase, the lead screw 32 of the servo cylinder 3 rises, driving the lifting concave spherical saddle 3221 to rise, which in turn drives the spherical lifting head 51 and the pull rod 5 to rise. The rise of the pull rod 5 allows the guide positioning block 52 installed on the pull rod 5 to be inserted into the conical hole of the guide positioning seat 7. In this state, the crane is then started to lift the weight and move it to the measurement position. The lateral force generated by the weight swaying during lifting and moving is borne by the guide positioning seat 7. Through the design of the guide positioning seat 7 and the guide positioning block 52, it is ensured that the violent swaying during lifting and moving of the weight will not cause a change in the position of the pull rod 5, thus ensuring the repeatability of the measurement.

[0053] To facilitate the intuitive reading of the weight mass measured by the suspended large mass comparator of this embodiment by the staff, a display instrument 82 and a PLC controller 81 connected to the sensor 2 are further fixedly installed on the cylinder cover 12 of the cylinder body 1, and the weight mass value is displayed on the display instrument 82.

[0054] Further, the PLC controller 81 controls the lifting distance of the screw rod 32 and controls the start and stop of the servo cylinder 3, so as to realize the connection and separation between the pull rod 5 and the connecting rod 4.

[0055] Further, the PLC controller 81 is externally connected with a power supply interface, which is responsible for supplying power to the PLC controller 81, the display instrument 82 and the servo cylinder 3.

[0056] Further, in order to facilitate the crane to lift the suspended large mass comparator and make the suspended large mass comparator in a horizontal state, a reinforcing ring 96 is welded on the top outer edge of the barrel 1, three hanging rings 93 are installed on the reinforcing ring 96 at equal intervals, and three uniformly arranged handles 94 are installed outside the barrel 1. The handles facilitate the user to move the comparator and prevent the comparator from swinging during the measurement. The three handles 94 correspond to and are connected with the three hanging rings 93.

[0057] The three hanging rings 93 on the barrel 1 are connected with a three-jaw lifting tool. The three-jaw lifting tool comprises a rotating lifting ring 97, a lifting ring seat 91 and a closed body basket 92. The rotating lifting ring 97 is installed on the lifting ring seat 91. Three uniformly arranged positioning pins 95 are installed on the lifting ring seat 91. Three closed body baskets 92 are provided, and the length of the closed body basket 92 can be adjusted. The upper end of the closed body basket 92 is connected with the positioning pin 95 on the lifting ring seat 91, and the lower end is connected with the hanging ring 93 on the reinforcing ring 13. The length of each closed body basket 92 can be adjusted to adjust the comparator to be in a horizontal state, and the rotating lifting ring 97 is hung on the crane.

[0058] When the suspended large mass comparator of the embodiment is used to detect the weight, in the lifting and moving stage, the suspended large mass comparator is hung on the crane hook, the servo cylinder 3 is started, the screw rod 32 of the servo cylinder 3 is lifted to drive the lifting concave spherical saddle 3221 to rise, and then drive the pull rod spherical lifting head 51 and the pull rod 5 to rise, so as to drive the clutch assembly pressure head 62 of the pull rod 5 to rise and separate from the clutch assembly saddle 61. In this state, the crane is started again to suspend the weight on the hanging ring 53 at the lower end of the pull rod 5 of the mass comparator, and then the weight is moved to the measurement position. Since the clutch assembly pressure head 62 of the pull rod 5 is in a separated state from the clutch assembly saddle 61, the pull rod 5 connected with the connecting rod 4 through the clutch assembly saddle 61 is in a separated state from the connecting rod 4. The weight suspended below the pull rod 5 cannot transmit the tension applied to the pull rod 5 to the connecting rod 4, and cannot convert the tension through the connecting rod spherical pull head 41 on the connecting rod 4 into pressure to apply to the sensor cover plate 22. The sensor 2 does not bear the pressure applied by the sensor cover plate 22 through the connecting rod spherical pull head 41. At this time, the sensor 2 is in a force-free state.

[0059] After the crane moves the weight to the measuring position, the measurement phase is entered, the servo cylinder 3 is started, the screw rod 32 of the servo cylinder 3 is retracted to make the pull rod spherical lifting head 51 and the pull rod 5 descend, and then drive the clutch assembly pressure head 62 of the pull rod 5 to descend and connect with the clutch assembly saddle 61, through the connection between the clutch assembly pressure head 62 and the clutch assembly saddle 61, the pull rod 5 and the connecting rod 4 are in a connected state, the weight suspended below the pull rod 5 will transmit the tension on the pull rod 5 to the connecting rod 4 through the clutch assembly saddle 61, the tension transmitted to the connecting rod 4 is converted into pressure by the connecting rod spherical pull head 41 and applied to the cover plate concave spherical saddle 221, and then to the sensor cover plate 22, the sensor 2 bears the pressure applied by the sensor cover plate 22 through the connecting rod spherical pull head 41, the sensor 2 is in a force state, and the weight is measured by measuring the pressure applied thereto. If the weight swings during the measurement phase, the sensor 2 will not swing with the weight because the sensor 2 is not arranged on the pull rod 5 and the connecting rod 4 connected with the pull rod 5.

[0060] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A suspended mass comparator characterized in that: The utility model provides a kind of servo cylinder lifting device, including cylinder (1), sensor support plate (21) is fixedly installed on the inner wall of cylinder (1), sensor (2) is fixedly installed on sensor support plate (21), sensor cover plate (22) capable of being pressed on sensor (2) is arranged above sensor (2), the cylinder body (31) of servo cylinder (3) is installed below sensor support plate (21), cylinder body (31) bottom is fixed on cylinder bottom plate (13), cylinder bottom plate (13) is fixedly installed on the inner wall of cylinder (1), screw rod (32) is arranged on the upper end of cylinder body (31), screw rod (32) upper end passes through sensor support plate (21) and is fixed in servo cylinder top plate (321) bottom, servo cylinder top plate (321) is between sensor cover plate (22) and sensor support plate (21), servo cylinder top plate (321) center is provided with top plate subsidence bucket (322), pull rod (5) is penetrated in the center of top plate subsidence bucket (322), the upper end of pull rod (5) is fixedly connected with clutch assembly pressure head (62), the lower end is connected with the lifting ring (53) for hoisting weight, pull rod (5) is fixedly installed in the position below clutch assembly pressure head (62) and can be pressed on servo cylinder top plate (321) pull rod spherical lifting head (51); Sensor cover plate (22) center is penetrated with connecting rod (4), the upper end of connecting rod (4) is fixedly connected with the connecting rod spherical pull head (41) pressed on sensor cover plate (22), and the lower end is fixedly installed with clutch assembly saddle (61), and pull rod (5) and connecting rod (4) can be separated and connected by clutch assembly saddle (61) matched with clutch assembly pressure head (62); When screw rod (32) of servo cylinder (3) rises, pull rod spherical lifting head (51) and pull rod (5) can be pushed to rise, in turn drive clutch assembly pressure head (62) of pull rod (5) to rise and separate from clutch assembly saddle (61);When screw rod (32) of servo cylinder (3) retracts, pull rod spherical lifting head (51) and pull rod (5) lose lifting, and under the action of gravity of itself and weight, in turn, clutch assembly pressure head (62) of pull rod (5) is lowered and connected with clutch assembly saddle (61).

2. The suspended mass comparators of claim 1, wherein: The clutch assembly saddle (61) is a hollow cavity with a bottom hole, the upper end of the pull rod (5) is inserted into the hollow part of the clutch assembly saddle (61) from the bottom hole of the clutch assembly saddle (61), and the clutch assembly pressure head (62) of the pull rod (5) can be pressed in the bottom of the hollow part of the clutch assembly saddle (61);The shape of the lower end of the clutch assembly pressure head (62) is inverted cone, and the part connected with the clutch assembly saddle (61) is set as taper hole;The clutch assembly pressure head (62) and pull rod (5) are fixedly connected by thread.

3. The suspended mass comparators of claim 1, wherein: The servo cylinder top plate (321) is fixedly installed with a lifting concave spherical saddle (3221) in the top plate sinking barrel (322), the pull rod spherical lifting head (51) is in a spherical shape matched with the lifting concave spherical saddle (3221), and the pull rod spherical lifting head (51) can be pressed on the lifting concave spherical saddle (3221); the lifting concave spherical saddle (3221) is below the clutch assembly saddle (61), the clutch assembly saddle (61) is in the top plate sinking barrel (322) provided on the servo cylinder top plate (321), and does not contact, and the lifting concave spherical saddle (3221) is provided with a through hole penetrating the pull rod (5) in the middle.

4. The suspended mass comparators of claim 1, wherein: The sensor cover plate (22) is fixedly installed with a cover plate concave spherical saddle (221), the connecting rod spherical pull head (41) is in a spherical shape matched with the cover plate concave spherical saddle (221), and the connecting rod spherical pull head (41) can be pressed on the cover plate concave spherical saddle (221); the connecting rod (4) and the clutch assembly saddle (61) are detachably fixedly connected through threads, and the cover plate concave spherical saddle (221) is provided with a through hole penetrating the connecting rod (4) in the middle.

5. The suspended mass comparators of claim 1, wherein: The center of the barrel bottom plate (13) is fixedly installed with a guide positioning seat (7), a tapered hole is formed in the guide positioning seat (7), and a guide positioning block (52) is fixedly installed on the pull rod (5) above the lifting ring (53) and matched with and embedded in the tapered hole of the guide positioning seat (7).

6. The suspended mass comparators of claim 1, wherein: Three sensors (2) are equidistantly arranged on the sensor support plate (21) in the circumferential direction, three servo cylinders (3) are equidistantly arranged on the barrel bottom plate (13) in the circumferential direction, and the three servo cylinders (3) and the three sensors (2) are alternately arranged; the central angle between adjacent servo cylinders (3) and sensors (2) is 60°, and the central angle between adjacent sensors (2) and sensors (2) is 120°; the servo cylinder top plate (321) and the sensor cover plate (22) are designed in a triangular star shape, and the sensor support plate (21) is designed in a circular ring shape, which can reduce the weight of the device, reduce the weight of the overall device, facilitate carrying to the site, and facilitate installation and maintenance of each part.

7. The suspended mass comparators of claim 1, wherein: A power unit (33) driving a lead screw (32) of each servo cylinder (3) is installed on the servo cylinder (3).

8. The suspended mass comparators of claim 3, wherein: A display instrument (82) connected with the sensor (2) and a PLC controller (81) connected with the power unit (33) are fixedly installed on the barrel (1).

9. The suspended mass comparators of claim 1, wherein: A reinforcing ring (96) is welded on the outer edge of the top of the barrel (1), three hanging rings (93) are equidistantly installed on the reinforcing ring (96), and three handles (94) are arranged uniformly outside the barrel (1), and the three handles (94) and the three hanging rings (93) are connected one by one.

10. The suspended mass comparators of claim 9, wherein: Three hanging rings (93) on the barrel (1) are connected with a three-jaw lifting device, the three-jaw lifting device comprises a rotating lifting ring (97), a lifting ring seat (91) and a closed body basket (92), the rotating lifting ring (97) is installed on the lifting ring seat (91), three positioning pins (95) are uniformly arranged on the lifting ring seat (91), and three closed body baskets (92) are arranged, the length of the closed body basket (92) can be adjusted, the upper end of the closed body basket (92) is connected with the positioning pin (95) on the lifting ring seat (91), and the lower end is connected with the hanging ring (93) on the reinforcing ring (96).

Images