A high-precision dual-channel slide automatic sampling and oil dripping device

Abstract

The present invention discloses a high-precision dual-channel slide automatic sampling and oil dripping device, wherein the slide is clamped by a mechanical claw, the gear stepper motor is connected to the mechanical claw, the stepper screw motor is connected to the gear stepper motor, the stepper motor mechanism converts the rotational motion of the motor screw into linear motion, thereby controlling the opening and closing of the mechanical claw, and then clamping the slide, and judging whether the slide is clamped by the change in the resistance value of the photoresistor, and controlling the movement steps of the gear stepper motor by forming a closed loop through the pressure sensor, and the stepper screw motor and the moving auxiliary guide rail drive the mechanical claw to rise and fall, thereby improving the sampling speed of the automatic film reader, increasing the turnover frequency of the instrument, and improving the detection efficiency.

Description

Technical Field

[0001] The invention relates to the medical equipment hygiene field, in particular to a high-precision dual-channel slide glass automatic sampling and oil dripping device. Background Art

[0002] At present, medical equipment is constantly improving the basic conditions of medical examinations and is also an important indicator of the degree of modernization. Medical equipment has become an important field of modern medicine, and the development of medical equipment has largely restricted the development of the medical industry.

[0003] The microscopic examination of peripheral blood cell morphology is the last step in clinical testing and is known as the "gold standard of clinical testing". In most cases, the microscopic examination of peripheral blood cell morphology mainly relies on clinical testers to observe blood smears with a microscope and count peripheral blood cells, which not only causes a high workload for clinical testers, but also requires strong work experience.

[0004] The emergence of automatic film readers has fully overcome the above shortcomings, freeing the hands of clinical laboratory staff and releasing them from boring work. However, the existing automatic film readers have a low turnover frequency and slow detection speed, resulting in low timeliness of detection. Summary of the invention

[0005] The purpose of the present invention is to provide a high-precision dual-channel slide automatic sampling and oil dripping device, aiming to solve the technical problems of low turnover frequency and slow detection speed of existing automatic slide readers in the prior art, resulting in poor timeliness of detection.

[0006] To achieve the above-mentioned purpose, the present invention adopts a high-precision dual-channel glass slide automatic sampling and oil dripping device, including a mechanical claw, a glass slide, a stepper motor mechanism, a dual-channel flip platform and a photoresistor, the mechanical claw clamps the glass slide, the glass slide is located at the bottom of the mechanical claw, the stepper motor mechanism is fixedly connected to the mechanical claw and is located on the side of the mechanical claw away from the glass slide, the dual-channel flip platform abuts against the glass slide and is located below the mechanical claw, the photoresistor is fixedly connected to the mechanical claw and is close to the glass slide, and is located between the glass slide and the mechanical claw; the stepper motor mechanism includes a gear stepper motor and a lifting drive assembly, the gear stepper motor is rotatably connected to the mechanical claw and is located on the side of the mechanical claw away from the glass slide, and the lifting drive assembly is slidably connected to the mechanical claw and is located on the side of the gear stepper motor away from the mechanical claw.

[0007] Among them, the lifting drive assembly includes a stepper screw motor and a movable sub-guide rail, the stepper screw motor is rotationally connected to the mechanical claw and is located on the side of the gear stepper motor away from the slide; the movable sub-guide rail is slidingly connected to the mechanical claw, and is fixedly connected to the stepper screw motor, and is located on the side of the stepper screw motor.

[0008] Wherein, the stepper motor mechanism also includes a pressure sensor, which is installed on the mechanical claw, receives the pressure signal of clamping the glass slide, and reversely controls the movement steps of the gear stepper motor.

[0009] Among them, the dual-channel flipping platform includes a reading and writing board and a flipping assembly, the reading and writing board is in contact with the glass slide and is located below the glass slide away from the mechanical claw; the flipping assembly is rotatably connected to the reading and writing board and is located on the side of the reading and writing board away from the glass slide.

[0010] Among them, the flipping assembly includes a transmission component and a flipping stepping motor, the transmission component is connected to the read-write board and drives the read-write board to rotate; the flipping stepping motor is connected to the transmission component and drives the transmission component to rotate, and is located at one end of the transmission component away from the read-write board.

[0011] Among them, the transmission component includes a synchronous wheel and a synchronous belt, the synchronous wheel is connected to the read-write board and drives the read-write board to rotate; the synchronous belt is connected to the synchronous wheel and connected to the flip stepping motor, and connects the synchronous wheel and the flip stepping motor.

[0012] The dual-channel flip platform further includes a radio frequency reader / writer, which is installed on the reader / writer board and reads and writes information on the glass slide.

[0013] Among them, the high-precision dual-channel glass slide automatic sampling and oil dripping device also includes an oil dripping mechanism and an oil dripping detection mechanism. The oil dripping mechanism is connected to the dual-channel flipping platform and is located on the side of the dual-channel flipping platform away from the mechanical claw and facing the glass slide; the oil dripping detection mechanism is connected to the oil dripping mechanism and faces the glass slide.

[0014] Wherein, the oil dripping mechanism includes an oil dripping component mounting plate and an oil dripping needle, the oil dripping component mounting plate is connected to the dual-channel flip platform and is located on the side of the dual-channel flip platform away from the mechanical claw; the oil dripping needle is fixedly connected to the oil dripping component mounting plate and faces the glass slide.

[0015] Among them, the oil drop detection mechanism includes a detection optical coupler and a controller, the detection optical coupler is located on the side of the oil drop component mounting plate close to the oil drop needle and facing the glass slide; the controller is connected to the detection optical coupler and to the oil drop needle, and controls the oil drop needle to drop oil.

[0016] The present invention discloses a high-precision dual-channel slide automatic sampling and oil dripping device, wherein the slide is clamped by the mechanical claw, the gear stepper motor is connected to the mechanical claw, the stepper screw motor is connected to the gear stepper motor, the stepper motor mechanism converts the rotational motion of the motor screw into linear motion, thereby controlling the opening and closing of the mechanical claw, and then clamping the slide, and judging whether the slide is clamped by the change in the resistance value of the photoresistor, and controlling the movement steps of the gear stepper motor by forming a closed loop through the pressure sensor, and the stepper screw motor and the moving auxiliary guide rail drive the mechanical claw to move up and down, thereby improving the sampling speed of the automatic film reader, increasing the turnover frequency of the instrument, and improving the detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is the general assembly diagram of the dual-channel automatic sampling and oil dripping device of the present invention.

[0019] Figure 2 It is an assembly diagram of the slide clamping component of the present invention.

[0020] Figure 3 It is an assembly diagram of the mechanical claw lifting mechanism of the present invention.

[0021] Figure 4 It is an assembly diagram of the dual-channel turnover platform of the present invention.

[0022] Figure 5 It is a diagram of the oil dripping component of the present invention.

[0023] Figure 6 It is a control logic schematic diagram of the oil dripping component of the present invention.

[0024] In the figure: 1-mechanical claw, 2-glass slide, 3-stepping motor mechanism, 4-dual-channel flip platform, 5-photoresistor, 6-oil dripping mechanism, 7-oil dripping detection mechanism, 31-gear stepping motor, 32-lifting drive assembly, 33-pressure sensor, 41-reading and writing board, 42-flipping assembly, 43-radio frequency reader, 61-oil dripping component mounting plate, 62-oil dripping needle, 71-detection optical coupler, 72-controller, 100-high-precision dual-channel glass slide automatic sampling and oil dripping device, 321-stepping screw motor, 322-moving auxiliary guide rail, 421-transmission component, 422-flipping stepping motor, 4211-synchronous wheel, 4212-synchronous belt. DETAILED DESCRIPTION

[0025] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0026] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, in the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0027] Embodiment 1:

[0028] See also Figure 1 , Figure 2 and Figure 3The present invention provides a high-precision dual-channel glass slide automatic sampling and oil dripping device 100, comprising a mechanical claw 1, a glass slide 2, a stepper motor mechanism 3, a dual-channel flip platform 4 and a photoresistor 5, wherein the mechanical claw 1 clamps the glass slide 2, and the glass slide 2 is located at the bottom of the mechanical claw 1, the stepper motor mechanism 3 is fixedly connected to the mechanical claw 1 and is located on the side of the mechanical claw 1 away from the glass slide 2, the dual-channel flip platform 4 abuts against the glass slide 2 and is located below the mechanical claw 1, the photoresistor 5 is fixedly connected to the mechanical claw 1 and is close to the glass slide 2, and is located between the glass slide 2 and the mechanical claw 1; the stepper motor mechanism 3 comprises a gear stepper motor 31 and a lifting drive assembly 32, the gear stepper motor 31 is rotationally connected to the mechanical claw 1 and is located on the side of the mechanical claw 1 away from the glass slide 2, and the lifting drive assembly 32 is slidingly connected to the mechanical claw 1 and is located on the side of the gear stepper motor 31 away from the mechanical claw 1.

[0029] Furthermore, the lifting drive assembly 32 includes a stepper screw motor 321 and a movable sub-guide rail 322, the stepper screw motor 321 is rotationally connected to the mechanical claw 1, and is located on the side of the gear stepper motor 31 away from the glass slide 2; the movable sub-guide rail 322 is slidingly connected to the mechanical claw 1, and is fixedly connected to the stepper screw motor 321, and is located on the side of the stepper screw motor 321.

[0030] Furthermore, the stepper motor mechanism 3 further includes a pressure sensor 33 , which is mounted on the mechanical claw 1 , receives a pressure signal for clamping the glass slide 2 , and reversely controls the movement steps of the gear stepper motor 31 .

[0031] In this embodiment, the mechanical claw 1, the stepper motor mechanism 3 and the dual-channel flip platform 4 are connected to a power supply and controlled by a controller 72. The opening and closing of the mechanical claw 1 are controlled by the gear stepper motor 31. A gear or a worm gear is installed in the gear stepper motor 31 for transmission, thereby changing the motion trajectory of the mechanical claw 1. When the blood smear to be tested is manually loaded, the glass slide 2 is automatically introduced to the bottom of the mechanical claw 1, and the mechanical claw 1 is gradually opened to clamp the glass slide 2. There is a huge difference between the movement mode and the transmission motor. The traditional motor adopts a screw or a synchronous wheel 4211 for transmission and can only perform rotational movement. The gear stepper motor 31 that drives the mechanical claw 1 to open and close uses a gear or a worm gear to change its movement direction, thereby realizing the function of clamping the slide 2. The mechanical claw 1 can realize the up and down lifting function, so as to realize the transfer of the slide 2 from the slide basket to the double channel. The lifting of the mechanical claw 1 can be achieved through the stepping screw motor 321 and the moving auxiliary guide. The stepping screw motor 321 is installed on the screw stepping motor mounting plate, the screw is connected to the lifting mechanical claw 1 mounting block installed on the moving secondary guide rail 322, and the lifting of the mechanical claw 1 is realized by the rotation of the screw. When the glass slide 2 coated with a blood film and stained is clamped by the mechanical claw 1, the clamping force is generally ensured by controlling the number of steps of the gear stepping motor 31, so as to ensure that the mechanical claw 1 does not crush the glass slide 2. Accordingly, a stepping screw motor 321 is installed on the mechanical claw 1. The pressure sensor 33 is installed, and the clamping force of the mechanical claw 1 on the glass slide 2 is received through the pressure sensor 33, and the pressure signal is transmitted to the controller 72, and the number of movement steps of the gear stepping motor 31 is reversely controlled by the controller 72, so as to ensure the integrity of the glass slide 2. In order to prevent the mechanical claw 1 from misoperating and failing to clamp the glass slide 2, the photoresistor 5 is installed on the mechanical claw 1 to judge whether the glass slide 2 exists. The photoresistor 5 is based on the internal photoelectric effect. When the light is stronger, its resistance value is lower;As the light intensity decreases, the resistance value will increase rapidly. After special treatment, the glass slide 2 cannot pass light. The photoresistors 5 installed on both sides of the mechanical claw 1 will gradually decrease in resistance as the mechanical claw 1 opens. When the mechanical claw 1 clamps the glass slide 2, the photoresistors 5 can no longer sense light and increase resistance, thereby judging whether the mechanical claw 1 has clamped the glass slide 2. In this way, the stepper motor converts the rotational motion of the motor screw into linear motion, thereby controlling the opening and closing of the mechanical claw 1, and then clamping the glass slide 2. The change in the resistance value of the photoresistor 5 is used to judge whether the glass slide 2 is clamped. The pressure sensor 33 forms a closed loop to control the number of movement steps of the gear stepper motor 31. The stepper screw motor 321 and the moving auxiliary guide rail 322 drive the mechanical claw 1 up and down, thereby increasing the feeding speed of the automatic film reader, increasing the turnover frequency of the instrument, and improving the detection efficiency. ;

[0032] Embodiment 2:

[0033] See also Figures 1 to 4 The present invention provides a high-precision dual-channel glass slide automatic sampling and oil dripping device 100, comprising a mechanical claw 1, a glass slide 2, a stepper motor mechanism 3, a dual-channel flip platform 4 and a photoresistor 5, wherein the mechanical claw 1 clamps the glass slide 2, and the glass slide 2 is located at the bottom of the mechanical claw 1, the stepper motor mechanism 3 is fixedly connected to the mechanical claw 1 and is located on the side of the mechanical claw 1 away from the glass slide 2, the dual-channel flip platform 4 abuts against the glass slide 2 and is located below the mechanical claw 1, the photoresistor 5 is fixedly connected to the mechanical claw 1 and is close to the glass slide 2, and is located between the glass slide 2 and the mechanical claw 1; the stepper motor mechanism 3 comprises a gear stepper motor 31 and a lifting drive assembly 32, the gear stepper motor 31 is rotationally connected to the mechanical claw 1 and is located on the side of the mechanical claw 1 away from the glass slide 2, and the lifting drive assembly 32 is slidingly connected to the mechanical claw 1 and is located on the side of the gear stepper motor 31 away from the mechanical claw 1.

[0034] Furthermore, the dual-channel flipping platform 4 includes a read-write board 41 and a flipping assembly 42, the read-write board 41 abuts against the glass slide 2 and is located below the glass slide 2 away from the mechanical claw 1; the flipping assembly 42 is rotationally connected to the read-write board 41 and is located on the side of the read-write board 41 away from the glass slide 2.

[0035] Furthermore, the flip assembly 42 includes a transmission component 421 and a flip stepper motor 422. The transmission component 421 is connected to the read-write board 41 and drives the read-write board 41 to rotate; the flip stepper motor 422 is connected to the transmission component 421 and drives the transmission component 421 to rotate, and is located at one end of the transmission component 421 away from the read-write board 41.

[0036] Furthermore, the transmission component 421 includes a synchronous wheel 4211 and a synchronous belt 4212, the synchronous wheel 4211 is connected to the read-write board 41, and drives the read-write board 41 to rotate; the synchronous belt 4212 is connected to the synchronous wheel 4211, and is connected to the flip stepping motor 422, and connects the synchronous wheel 4211 and the flip stepping motor 422.

[0037] Furthermore, the dual-channel flip platform 4 also includes a radio frequency reader 43 , which is installed on the reader-writer board 41 and reads and writes information of the glass slide 2 .

[0038] In this embodiment, when the mechanical claw 1 transfers the glass slide 2 to the read-write board 41 on the dual-channel flip platform 4, the glass slide 2 and the patient information can be read and written by the radio frequency reader 43 installed on the read-write board 41. The dual-channel flip platform 4 is flipped by the cooperation of the flip stepping motor 422, the synchronous belt 4212, the synchronous wheel 4211, etc. The flip stepping motor 422 drives the synchronous belt 4212 to rotate, thereby driving the synchronous wheel 42 11 rotates, the synchronous wheel 4211 is connected with the reading and writing board 41 through the shaft rod, thereby driving the reading and writing board 41 to flip over. When the mechanical claw 1 clamps the glass slide 2 over, the reading and writing board 41 of the dual-channel flipping platform 4 is in an upright state. When the glass slide 2 enters any channel of the dual channels, the reading and writing board 41 will flip over. In this way, the dual-channel sampling mechanism is used to queue and turn over blood smears, which can quickly increase the throughput of the automatic film reader, improve the detection speed, and ensure the timeliness of the detection.

[0039] Embodiment 3:

[0040] See also Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 6The present invention provides a high-precision dual-channel glass slide automatic sampling and oil dripping device 100, comprising a mechanical claw 1, a glass slide 2, a stepper motor mechanism 3, a dual-channel flip platform 4 and a photoresistor 5, wherein the mechanical claw 1 clamps the glass slide 2, and the glass slide 2 is located at the bottom of the mechanical claw 1, the stepper motor mechanism 3 is fixedly connected to the mechanical claw 1 and is located on the side of the mechanical claw 1 away from the glass slide 2, the dual-channel flip platform 4 abuts against the glass slide 2 and is located below the mechanical claw 1, the photoresistor 5 is fixedly connected to the mechanical claw 1 and is close to the glass slide 2, and is located between the glass slide 2 and the mechanical claw 1; the stepper motor mechanism 3 comprises a gear stepper motor 31 and a lifting drive assembly 32, the gear stepper motor 31 is rotationally connected to the mechanical claw 1 and is located on the side of the mechanical claw 1 away from the glass slide 2, and the lifting drive assembly 32 is slidingly connected to the mechanical claw 1 and is located on the side of the gear stepper motor 31 away from the mechanical claw 1.

[0041] Furthermore, the high-precision dual-channel glass slide automatic sampling and oil dripping device 100 also includes an oil dripping mechanism 6 and an oil dripping detection mechanism 7, the oil dripping mechanism 6 is connected to the dual-channel flipping platform 4, and is located on the side of the dual-channel flipping platform 4 away from the mechanical claw 1 and facing the glass slide 2; the oil dripping detection mechanism 7 is connected to the oil dripping mechanism 6 and faces the glass slide 2.

[0042] Furthermore, the oil dripping mechanism 6 includes an oil dripping component mounting plate 61 and an oil dripping needle 62, the oil dripping component mounting plate 61 is connected to the dual-channel flip platform 4 and is located on the side of the dual-channel flip platform 4 away from the mechanical claw 1; the oil dripping needle 62 is fixedly connected to the oil dripping component mounting plate 61 and faces the glass slide 2.

[0043] Furthermore, the oil drop detection mechanism 7 includes a detection optical coupler 71 and a controller 72, the detection optical coupler 71 is located on the side of the oil drop component mounting plate 61 close to the oil drop needle 62 and facing the glass slide 2; the controller 72 is connected to the detection optical coupler 71 and to the oil drop needle 62, and controls the oil drop needle 62 to drop oil.

[0044] In this embodiment, after the read-write board 41 is flipped 90°, it can be clamped away by the grabbing claw on the XY platform, and the oil dripping component mounting plate 61 is installed on the side of the dual-channel flipping platform 4, and the oil dripping needle 62 is located at the end of the oil dripping component mounting plate 61, facing the glass slide 2. At this time, the glass slide 2 can be treated with oil dripping. When dripping oil, open the valve to open the oil dripping liquid path, and use a pump to pump oil. Under the pressure of the pump, the oil is dripped out of the oil dripping needle 62, and the detection optical coupler 71 receives a signal to indicate whether the oil droplets are pumped out, and transmits it to the controller 72. If so, stop pumping oil; if not, continue pumping oil. In this way, the detection optical coupler 71 is used to judge whether there are oil droplets, realize the oil dripping function, and monitor the amount of oil dripping, thereby improving the efficiency of the oil dripping process and thus improving the detection speed.

[0045] What is disclosed above is only a preferred embodiment of the present invention, and it certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A high-precision dual-channel slide automatic sampling and oil dripping device, characterized in that: It includes a mechanical claw, a glass slide, a stepper motor mechanism, a dual-channel flip platform and a photoresistor. The mechanical claw clamps the glass slide, the glass slide is located at the bottom of the mechanical claw, the stepper motor mechanism is fixedly connected to the mechanical claw and is located on a side of the mechanical claw away from the glass slide, the dual-channel flip platform abuts against the glass slide and is located below the mechanical claw, and the photoresistor is fixedly connected to the mechanical claw and is close to the glass slide and is located between the glass slide and the mechanical claw; The stepper motor mechanism includes a gear stepper motor and a lifting drive assembly, wherein the gear stepper motor is rotationally connected to the mechanical claw and is located on a side of the mechanical claw away from the slide, and the lifting drive assembly is slidably connected to the mechanical claw and is located on a side of the gear stepper motor away from the mechanical claw; The stepper motor mechanism further includes a pressure sensor, which is mounted on the mechanical claw, receives a pressure signal of clamping the glass slide, and reversely controls the movement steps of the gear stepper motor; The dual-channel flip platform includes a read-write board and a flip assembly. The read-write board abuts against the glass slide and is located below the glass slide away from the mechanical claw; the flip assembly is rotationally connected to the read-write board and is located on the side of the read-write board away from the glass slide.

2. The high-precision dual-channel slide automatic sampling and oil dripping device according to claim 1, characterized in that: The lifting drive assembly includes a stepper screw motor and a movable sub-guide rail. The stepper screw motor is rotationally connected to the mechanical claw and is located on the side of the gear stepper motor away from the slide. The movable sub-guide rail is slidingly connected to the mechanical claw and fixedly connected to the stepper screw motor and is located on the side of the stepper screw motor.

3. The high-precision dual-channel slide automatic sampling and oil dripping device according to claim 1, characterized in that: The flip assembly includes a transmission component and a flip stepper motor. The transmission component is connected to the read-write board and drives the read-write board to rotate. The flip stepper motor is connected to the transmission component and drives the transmission component to rotate, and is located at one end of the transmission component away from the read-write board.

4. The high-precision dual-channel slide automatic sampling and oil dripping device as claimed in claim 3, characterized in that: The transmission component includes a synchronous wheel and a synchronous belt. The synchronous wheel is connected to the read-write board and drives the read-write board to rotate; the synchronous belt is connected to the synchronous wheel and to the flip stepping motor, and connects the synchronous wheel and the flip stepping motor.

5. The high-precision dual-channel slide automatic sampling and oil dripping device according to claim 4, characterized in that: The dual-channel flip platform also includes a radio frequency reader / writer, which is installed on the reader / writer board and reads and writes information on the glass slide.

6. The high-precision dual-channel slide automatic sampling and oil dripping device according to claim 1, characterized in that: The high-precision dual-channel glass slide automatic sampling and oil dripping device also includes an oil dripping mechanism and an oil dripping detection mechanism. The oil dripping mechanism is connected to the dual-channel flipping platform and is located on the side of the dual-channel flipping platform away from the mechanical claw and facing the glass slide; the oil dripping detection mechanism is connected to the oil dripping mechanism and faces the glass slide.

7. The high-precision dual-channel slide automatic sampling and oil dripping device according to claim 6, characterized in that: The oil dripping mechanism includes an oil dripping component mounting plate and an oil dripping needle. The oil dripping component mounting plate is connected to the dual-channel flip platform and is located on the side of the dual-channel flip platform away from the mechanical claw; the oil dripping needle is fixedly connected to the oil dripping component mounting plate and faces the glass slide.

8. The high-precision dual-channel slide automatic sampling and oil dripping device according to claim 7, characterized in that: The oil drop detection mechanism includes a detection optical coupler and a controller. The detection optical coupler is located on a side of the oil drop component mounting plate close to the oil drop needle and facing the glass slide. The controller is connected to the detection optical coupler and to the oil drop needle, and controls the oil drop needle to drop oil.

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