Safety protection device for multifunctional work vehicle used in oilfield

Abstract

The present invention discloses a safety protection device for a multi-functional work vehicle used in oil fields. The multi-functional work vehicle includes a vehicle body, a first boom, a first oil cylinder and a second oil cylinder. The first boom is rotatably connected to one side of the upper end of the vehicle body. The first oil cylinder and the second oil cylinder are arranged side by side on one side of the lower end of the first boom. The two ends of the first oil cylinder and the second oil cylinder are respectively rotatably connected to the vehicle body and the first boom. It is characterized in that it includes: a controller installed on the vehicle body, a first sensor installed on the first boom, a second sensor installed on the large and small chambers of the first oil cylinder, and a third sensor installed on the large and small chambers of the second oil cylinder. The first sensor, the second sensor and the third sensor are all connected to the controller in a signal manner. The advantages of the present invention over the prior art are: it can accurately calculate the current load and avoid false alarms caused by the influence of the ground state.

Description

Technical Field

[0001] This invention patent relates to the technical field of multi-functional work vehicles for oil fields, specifically referring to a safety protection device for a multi-functional work vehicle for oil fields. Background Art

[0002] A multi-functional work vehicle for oil fields is a work vehicle capable of performing hoisting operations. The rigging is usually installed on the boom. In a multi-functional work vehicle for oil fields, the load data is a key point affecting the overall working performance and safety of the multi-functional work vehicle for oil fields. During the load-bearing operation of the multi-functional work vehicle for oil fields, if the displacement of the boom is too large, it will cause serious consequences of tipping over. To avoid tipping accidents during the operation of the multi-functional work vehicle for oil fields, a safety protection device needs to be set up.

[0003] The Chinese invention patent application with the publication number CN 105692514A discloses a safety limit device and a tunnel arch support work vehicle for the safety limit of a sliding table on a guide rail, including a vertical plate. The vertical plate is movably installed on the sliding table. An expansion cylinder is arranged above the vertical plate, and the expansion cylinder is fixedly installed on the sliding table. The expansion cylinder is used to control the vertical plate to swing with the connection point between the vertical plate and the sliding table as the fulcrum. An adjustable positioning block is arranged below the vertical plate, and the adjustable positioning block will press tightly on the guide rail when the expansion cylinder extends to a specified length. The invention also provides a tunnel arch support work vehicle, on which the above-mentioned safety limit device is installed. It cannot evaluate the safety of the work vehicle against tipping according to the actual load, and has a low degree of automation. When there is a tipping risk, it cannot automatically give an audible and visual alarm.

[0004] To improve the degree of automation, the work vehicle needs to measure and display the load of the rigging in real time and compare it with the theoretical value. When a multi-functional work vehicle for oil fields is operating, different slight deformations will occur in the front and rear axles. The prior art adopts the axle stress detection method. The rear axle sensor detects the slight deformation of the axle in real time to judge the current force condition of the axle, and then compares and calculates it with the current force condition of the front axle to judge the current state of the vehicle and prevent the whole vehicle from tipping over. The disadvantages of this stress detection method are as follows: 1. It can only roughly estimate the load based on the force on the axle and cannot accurately weigh the load; 2. It cannot display the position of the load; 3. It is easily affected by the ground condition. Different ground conditions may cause deviations in the sensor data, resulting in false alarms during driving. Summary of the Invention

[0005] This invention patent aims to solve the technical problems mentioned in the above background art and provides a safety protection device for a multi-functional work vehicle for oil fields that can accurately calculate the load.

[0006] The technical solution provided by this invention patent is as follows: A safety protection device for a multi-functional work vehicle used in oil fields. The multi-functional work vehicle includes a vehicle body, a first boom, a first oil cylinder, and a second oil cylinder. The first boom is rotatably connected to one side of the upper end of the vehicle body. The first oil cylinder and the second oil cylinder are arranged side by side on one side of the lower end of the first boom. The two ends of the first oil cylinder and the second oil cylinder are respectively rotatably connected to the vehicle body and the first boom. It is characterized in that it includes: a controller installed on the vehicle body, a first sensor installed on the first boom, a second sensor installed on the large and small chambers of the first oil cylinder, a third sensor installed on the large and small chambers of the second oil cylinder. The first sensor, the second sensor, and the third sensor are all connected to the controller by signals.

[0007] Furthermore, it also includes a display. The display is installed in the cab of the vehicle body and is connected to the controller by signals.

[0008] Furthermore, it also includes an audible and visual alarm. The audible and visual alarm is connected to the controller by signals.

[0009] Furthermore, the first sensor is a length and angle sensor, which is used to measure the extended length of the cantilever of the multi-functional work vehicle and the angle relative to the vehicle body plane.

[0010] Furthermore, the first oil cylinder is a pitching oil cylinder, and the second sensor is a pitching pressure sensor, which is used to measure the force on the pitching oil cylinder.

[0011] Furthermore, the second oil cylinder is a balance oil cylinder, and the third sensor is a balance pressure sensor, which is used to measure the force on the balance oil cylinder.

[0012] Furthermore, the controller controls the movement of the vehicle body, the switch of the audible and visual alarm, and the real-time display of the display.

[0013] Furthermore, when Mq≥M1, the controller sends out an alarm signal, where M1 is the stable moment generated by the self-weight of the work vehicle, and Mq is the moment generated by the gravity of the load and the gravity of the boom, and the calculation formula is as follows:

[0014] M q =F1L2cos(α-β)+F2L5cos(α-β)=W(L2+L3+L4)cosα+G2(L2+L4)cosα

[0015] Where: F1 is the pressure on the pitching oil cylinder, F2 is the pressure on the balance oil cylinder, α is the boom inclination angle, β is the inclination angle of the pitching oil cylinder, L2 is the distance from the support point of the pitching oil cylinder to the boom hinge point, L3 is the distance from the boom center of gravity to the support point of the pitching oil cylinder, L4 is the distance from the boom center of gravity to the distance of the boom head, L5 is the distance from the support point of the balance oil cylinder to the boom hinge point, L6 is the distance from the boom center of gravity to the support point of the balance oil cylinder.

[0016] The advantages of this invention patent compared with the prior art are as follows: The load weight at different current positions is measured by pressure sensors and length-angle sensors. The controller calculates and compares it with the load chart to determine the current stability state of the vehicle body, avoiding the vehicle from tipping over due to the change of the center of gravity and also avoiding false alarms caused by the influence of the ground conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of a multi-functional work vehicle and a safety protection device according to an embodiment of this invention patent;

[0018] Figure 2 is Figure 1 the load chart of the multi-functional work vehicle shown in

[0019] Figure 3 is Figure 1 a schematic diagram of the force analysis of the boom of the multi-functional work vehicle shown in

[0020] Figure 4 is Figure 1 a schematic diagram of the force analysis of the whole vehicle of the multi-functional work vehicle shown in

[0021] In the drawings: 1. Vehicle body; 2. First boom section; 3. First oil cylinder; 4. Second oil cylinder; 5. First sensor; 6. Second sensor; 7. Third sensor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below with reference to specific drawings.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0024] Combined with Figures 1-4 shown in

[0025] The balance pressure sensors are respectively installed on the large and small chambers of the balance oil cylinder to measure the force on the balance oil cylinder. The pitching pressure sensors are respectively installed on the large and small chambers of the pitching oil cylinder to measure the force on the pitching oil cylinder. The length and angle sensors are installed on the first boom 2 to measure the extension length of the boom and the inclination angle relative to the chassis 1 of the vehicle body. The controller is installed on the vehicle body 1 to control the switch of the audible and visual alarm, the real-time display of the monitor, and control the safety limit of the operation handle to prevent the driver from misoperation and causing the vehicle body 1 to tip over. The audible and visual alarm and the monitor are installed in the cab to remind the driver.

[0026] In the specific implementation of this invention patent:

[0027] Combined with Figure 1 As shown, when the multi-functional work vehicle for oil fields lifts and extends the load, the pitching oil cylinder and the balance oil cylinder start to work, pushing the boom to lift. The pressure sensors on the large and small chambers of the pitching oil cylinder and the pressure sensors on the large and small chambers of the balance oil cylinder detect the force on the oil cylinder. The length and angle sensors detect the current extension length of the boom and the angle between the boom and the chassis, and then send them to the controller. The controller calculates through the known data of the vehicle body structure and compares with Figure 2 the load chart data in it to obtain the current vehicle condition data, and displays the load center weight detected by the sensor and the boom state in real time on the monitor for the driver to refer to for operation. If there is a risk of tipping over, the audible and visual alarm will give an alarm.

[0028] Combined with Figure 3 、 Figure 4 As shown, Figure 4 is the force analysis model of the multi-functional work vehicle for oil fields when it is in the working state; Figure 3 is the force analysis model of the boom of the multi-functional work vehicle for oil fields when it is in the working state.

[0029] During the working process of the multi-functional work vehicle for oil fields, the moments generated by the forces it receives are as follows:

[0030] (1) The stabilizing moment generated by the self-weight of the multi-functional work vehicle for oil fields is:

[0031] M1 = G(0.5L1 + C)

[0032] Where: G — the self-weight of the multi-functional work vehicle for oil fields;

[0033] L1 — the tire spacing;

[0034] C — the horizontal distance between the hinge point and the center of gravity;

[0035] (2) The moment generated by the lifting load is calculated by using the pressure on the pitching oil cylinder:

[0036] F1L2cosαcosβ + F1L2sinαsinβ + F2L5cosαcosγ + F2L5sinαsinγ - W(L2 + L3 + L4)cosα

[0037] -G2(L2 + L4)cosα = 0

[0038] That is: F1L2cos(α - β) + F2L5cos(α - β) = W(L2 + L3 + L4)cosα + G2(L2 + L4)cosα

[0039] Where: G2 — the gravity of the arm

[0040] W — represents the gravity of the load

[0041] L2 — the distance from the support point of the pitching cylinder to the arm hinge point

[0042] L3 — the distance from the center of gravity of the arm to the support point of the pitching cylinder

[0043] L4 — the distance from the center of gravity of the arm to the head of the arm

[0044] L5 — the distance from the support point of the balance cylinder to the arm hinge point

[0045] L6 — the distance from the center of gravity of the arm to the support point of the balance cylinder

[0046] F1 — the pressure on the pitching cylinder

[0047] F2 — the pressure on the balance cylinder

[0048] After arranging the formula F1L2cos(α - β) + F2L5cos(α - β) = W(L2 + L3 + L4)cosα + G2(L2 + L4)cosα, the moment M generated by the gravity of the load and the gravity of the arm is obtained q :

[0049] M q = F1L2cos(α - β) + F2L5cos(α - β) = W(L2 + L3 + L4)cosα + G2(L2 + L4)cosα

[0050] It can be seen from the above formula that to determine the moment M generated by the gravity of the load and the gravity of the arm q , it is only necessary to measure or determine the pressure F1 on the pitching cylinder, that is, the supporting force of the pitching cylinder, the pressure F2 on the balance cylinder, that is, the supporting force of the balance cylinder, the arm inclination angle α, the inclination angle β of the pitching cylinder, and the inclination angle γ of the balance cylinder. The inclination angle β can be obtained from the function of l2 and α as β = f(L2, α), and the inclination angle γ can be obtained from the function of l5 and α as γ = f(L5, α).

[0051] It is concluded that when Mq < M1, the multi-functional work vehicle for oil fields is in a stable state.

[0052] Although the embodiments of the present invention have been shown and described, demonstrating the basic principles, main features and advantages of the present invention, the scope of patent protection of the present invention is not limited thereby. Those of ordinary skill in the art can understand that the present invention is not limited by the above embodiments. Except for the above embodiments, various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and purposes of the present invention. All technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of protection required by the present invention. The scope of protection required by the present invention is defined by the appended claims and their equivalents. The technical features not described in the present invention can be realized by or adopted from existing technologies and will not be elaborated herein.

Claims

1. A safety protection device for a multi-functional work vehicle used in oil fields. The multi-functional work vehicle includes a vehicle body (1), a first boom (2), a first oil cylinder (3), and a second oil cylinder (4). The first boom (2) is rotatably connected to one side of the upper end of the vehicle body (1). The first oil cylinder (3) and the second oil cylinder (4) are arranged side by side on one side of the lower end of the first boom (2). The two ends of the first oil cylinder (3) and the second oil cylinder (4) are respectively rotatably connected to the vehicle body (1) and the first boom (2). It is characterized in that, Including: A controller installed on the vehicle body (1), a first sensor (5) installed on the first boom (2), a second sensor (6) installed on the large and small chambers of the first oil cylinder (3), and a third sensor (7) installed on the large and small chambers of the second oil cylinder (4). The first sensor (5), the second sensor (6), and the third sensor (7) are all connected to the controller by signal; The first sensor (5) is a length and angle sensor, which is used to measure the extension length of the cantilever of the multi-functional work vehicle and the angle relative to the vehicle body plane; The first oil cylinder (3) is a pitching oil cylinder, and the second sensor (6) is a pitching pressure sensor, which is used to measure the force on the pitching oil cylinder; The second oil cylinder (4) is a balance oil cylinder, and the third sensor (7) is a balance pressure sensor, which is used to measure the force on the balance oil cylinder; When Mq≥M1, the controller issues an alarm signal, where M1 is the stable moment generated by the dead weight of the work vehicle, and Mq is the moment generated by the gravity of the load and the boom, and the calculation formula is as follows: M q = F1L2cos(α - β) + F2L5cos(α - β) = W(L2 + L3 + L4)cosα + G2(L2 + L4)cosα Where: F1 is the pressure on the pitching oil cylinder, F2 is the pressure on the balance oil cylinder, α is the boom inclination angle, β is the inclination angle of the pitching oil cylinder, L2 is the distance from the support point of the pitching oil cylinder to the boom hinge point, L3 is the distance from the boom center of gravity to the support point of the pitching oil cylinder, L4 is the distance from the boom center of gravity to the boom head, L5 is the distance from the support point of the balance oil cylinder to the boom hinge point, and L6 is the distance from the boom center of gravity to the support point of the balance oil cylinder; Measure the load weight at different current positions through the pitching pressure sensor, the balance pressure sensor, and the length and angle sensor, calculate through the controller and compare with the load chart, so as to judge the current vehicle body stability state and avoid the whole vehicle from tipping over due to the change of the center of gravity.

2. The safety protection device of the multi-functional work vehicle for oil fields according to claim 1, characterized in that: It further includes a display, which is installed in the cab of the vehicle body (1) and is connected to the controller by signal.

3. The safety protection device of the multi-functional work vehicle for oil fields according to claim 1, characterized in that: It further includes an audible and visual alarm, which is connected to the controller by signal.

4. The safety protection device of the multi-functional work vehicle for oil fields according to claim 3, characterized in that: The controller controls the movement of the vehicle body, the switch of the audible and visual alarm, and the real-time display of the display.

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