A high oleic peanut oil pressing device

Abstract

The utility model relates to the technical field of peanut oil production, and disclose a kind of high oleic acid peanut oil squeezing device, including rack, press bore, receiving frame, the receiving frame is fixedly connected with rack, the inner wall of press bore is rotatably connected with press screw, the side of rack is provided with notch, the side of rack is fixedly connected with the support plate of L shape, the end of press screw extends out rack and is rotatably connected with support plate by passing through notch, the outer circumferential surface of press bore one end is rotatably connected with adjusting frame. This kind of high oleic acid peanut oil squeezing device, by setting adjusting assembly can control the dosage of peanut into press bore, it is convenient according to the characteristics of different batches of peanuts and the required squeezing effect, flexibly adjust feed quantity, to meet the diversified squeezing production demand, set post-processing component can filter after squeezing peanut oil, improve the purity of peanut oil, and peanut residue can be dried, facilitate subsequent feed production, effectively improve the comprehensive utilization of resources.

Description

Technical Field

[0001] This utility model relates to the field of peanut oil production technology, specifically to a high oleic acid peanut oil pressing device. Background Technology

[0002] Peanut oil production refers to the entire process of extracting oil from peanuts using a series of physical and chemical methods, followed by refining and processing to finally produce peanut oil products that meet edible standards.

[0003] An existing patent (publication number: CN220973452U) discloses a continuous peanut oil press, which includes a base plate. The top of the base plate is fixedly connected to the oil press body, and an L-shaped block is fixedly connected to the top of the base plate. A feeding bin is fixedly connected to the side wall of the L-shaped block. A first motor is fixedly connected to the rear side wall of the feeding bin. The output shaft of the first motor passes through the side wall of the feeding bin and is movably connected to the inner wall of the feeding bin. A material-blocking roller is fixedly connected to the output shaft of the first motor. A material-collecting groove is formed on the material-blocking roller. A discharge port is formed at the bottom of the feeding bin. A vertical block is fixedly connected to the top of the L-shaped block. A storage bin is fixedly connected to the top of the vertical block. A feeding pipe is fixedly connected to the top of the storage bin, and a discharge pipe is fixedly connected to the bottom of the storage bin. With this structure, material can be continuously added to the oil press body, thereby improving the ease of use of the oil press.

[0004] The aforementioned pressing device can continuously add material to the oil press body during use, thereby improving the ease of use of the oil press. However, since the size of the material collection trough on the material blocking roller is fixed, the metering of peanuts fed into the device is also fixed and difficult to adjust flexibly. It is impossible to accurately control the amount of material fed each time according to different production needs or peanut variety characteristics. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a high-oleic peanut oil pressing device, which has the advantages of flexible adjustment of feed rate and cooling of the screw press, thus solving the problems mentioned in the background technology.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a high oleic acid peanut oil pressing device, comprising a frame, a pressing chamber, and a receiving frame. The receiving frame is fixedly connected to the frame. A pressing screw is rotatably connected to the inner wall of the pressing chamber. A slot is opened on one side of the frame. An L-shaped support plate is fixedly connected to one side of the frame. One end of the pressing screw extends through the slot and out of the frame, rotatably connected to the support plate. An adjusting frame is rotatably connected to the outer circumferential surface of one end of the pressing chamber. The adjusting frame is fixedly connected to the pressing screw. A feeding groove is opened on the surface of the pressing chamber. Multiple feeding grooves are circumferentially distributed on the outer circumferential surface of the adjusting frame. The feeding grooves correspond to the positions of adjacent feeding grooves. A feeding cylinder with a conical bottom is fixedly installed on the inner wall of the frame. The feeding cylinder contacts the outer circumferential surface of the adjusting frame, and the bottom of the feeding cylinder is designed to fit the outer surface of the adjusting frame. The adjustment box contains adjustment components. The rack is equipped with post-processing components; The screw press has a cavity formed along its axial direction, and a cooling component is installed inside the cavity.

[0007] Furthermore, the adjustment component includes multiple sliding grooves formed on the outer circumferential surface of the adjustment frame, and an adjustment plate is slidably connected inside each sliding groove via a self-locking slide rail. Each adjustment plate has a connecting hole on its outer surface.

[0008] The above scheme includes an adjustment plate that works in conjunction with the connecting holes on its surface. When the adjustment plate is slid, the relative position of the connecting holes and the feed trough and feeding trough can be changed, thereby adjusting the amount of peanuts entering the pressing chamber from the feed trough to meet different pressing needs.

[0009] Furthermore, the post-processing assembly includes two processing cylinders fixedly connected to the inner wall of the frame. The inner walls of the two processing cylinders are rotatably connected to rotating rods, and the outer surfaces of the two rotating rods are fixedly connected to feeding augers. A resistance heating plate is fixedly installed on the outer surface of one processing cylinder, and a discharge frame is fixedly connected to the outer surface of the other processing cylinder. The discharge frame passes through the frame, and a filter screen is installed on the inner wall of the discharge frame. The filter screen contacts the adjacent feeding auger.

[0010] The above scheme allows for the separate processing of pressed peanut oil and impurities using two different processing cylinders. One cylinder filters the peanut oil through a screen, thereby improving its purity, while the other cylinder dries the pressed peanut impurities for subsequent feed production.

[0011] Furthermore, the adjacent ends of the two rotating rods are connected to a belt drive via pulleys, one end of one of the rotating rods is fixedly connected to the output end of an external motor, and the bottom end of the receiving frame is fixedly connected to the adjacent processing cylinder via a pipe.

[0012] The above-mentioned method enables the belt-connected transmission to achieve synchronous rotation of the two rotating rods, ensuring the stable operation of the post-processing components. At the same time, the receiving frame is connected to the processing cylinder, facilitating the direct transport of pressed peanut oil and impurities to the processing cylinder for processing.

[0013] Furthermore, an inclined plate is installed on the inner wall of the frame, a vibration motor is fixedly installed on the inner wall of the frame, the output end of the vibration motor is fixedly connected to the inclined plate, a collection frame is fixedly installed on the upper surface of the frame, the bottom end of the collection frame is located inside the frame, and an inlet groove is opened on the surface of the processing cylinder adjacent to the inclined plate.

[0014] The above scheme uses a vibrating motor to drive the inclined plate to vibrate, which can cause peanut impurities falling on the inclined plate to enter the adjacent processing cylinder through vibration, making it easier to collect and process the impurities.

[0015] Furthermore, the cooling component includes a connecting rod, one end of which is threaded to the inner wall of the cavity. A flow guide auger is fixedly connected to the circumferential surface of the connecting rod. A concave groove is formed on the outer circumferential surface of the screw press near the feed cylinder. Multiple flow holes communicating with the cavity are opened on the inner wall of the concave groove. A sealing ring is rotatably connected to the inner wall of the concave groove through a sealing bearing. A return pipe is fixedly connected to the outer circumferential surface of the sealing ring. The return pipe is fixedly connected to an external liquid storage device. An L-shaped water inlet groove is opened at one end of the connecting rod. One end of the water inlet groove is connected to the cavity, and the other end of the water inlet groove is connected to an external water supply pipe through a rotating connector.

[0016] The above solution enables the cooling components to cool the screw press in a timely manner through the flow of water, preventing the screw press from deforming or being damaged due to excessive temperature, ensuring the normal operation of the pressing device, and extending the service life of the equipment.

[0017] Furthermore, a drive motor is installed on the inner wall of the frame, and the output end of the drive motor is fixedly connected to one end of the screw press.

[0018] The above solution provides power for the rotation of the screw press, enabling it to rotate normally within the pressing chamber and thus achieving the peanut pressing process.

[0019] Compared with the prior art, the technical solution of this utility model has the following beneficial effects: This high-oleic peanut oil pressing device features an adjustable component that controls the amount of peanuts entering the pressing chamber. This allows for flexible adjustment of the feed rate based on the characteristics of different batches of peanuts and the desired pressing effect, thus meeting diverse pressing production needs. The post-processing component filters the pressed peanut oil, improving its purity, and dries the peanut residue for subsequent feed production, effectively increasing resource utilization and reducing waste generation. It also ensures the quality of the peanut oil and the reuse value of the peanut residue. Finally, a cooling component cools the screw press during the pressing process, preventing thermal fatigue and decreased hardness caused by prolonged high-temperature operation. This ensures the screw press maintains optimal operating conditions, reduces equipment failure rates, extends the overall equipment lifespan, and lowers maintenance and replacement costs for businesses. Attached Figure Description

[0020] Figure 1 This is a cross-sectional view of the overall structure of this application; Figure 2 For this application Figure 1 Enlarged schematic diagram of the structure at point A; Figure 3 For this application Figure 1 Enlarged schematic diagram of the structure at point B; Figure 4 For this application Figure 1 Enlarged schematic diagram of the structure at point C; Figure 5 This is a separate structural diagram of the adjustment frame and adjustment plate in this application; Figure 6 This is a schematic diagram of the groove structure in this application; Figure 7 This is a schematic diagram of the overall structure of this application. Figure 1 ; Figure 8 This is a schematic diagram of the overall structure of this application. Figure 2 .

[0021] In the picture: 1. Frame; 2. Pressing chamber; 3. Receiving frame; 4. Screw press; 5. Groove; 6. Support plate; 7. Adjusting frame; 8. Feed chute; 9. Feeding chute; 10. Feeding cylinder; 11. Adjustment components; 1101. Slide groove; 1102. Adjusting plate; 1103. Connecting hole; 12. Post-processing components; 1201. Processing cylinder; 1202. Rotating rod; 1203. Feeding auger; 1204. Resistance heating plate; 1205. Discharge frame; 1206. Filter screen; 13. Cavity; 14. Cooling components; 1401. Connecting rod; 1402. Flow guide auger; 1403. Concave groove; 1404. Flow hole; 1405. Sealing ring; 1406. Return pipe; 1407. Water inlet tank; 15. Inclined plate; 16. Vibration motor; 17. Collection frame; 18. Inlet trough; 19. Drive motor. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] Please see Figures 1-8 This embodiment of a high-oleic peanut oil pressing device includes a frame 1, a pressing chamber 2, and a receiving frame 3. The receiving frame 3 is fixedly connected to the frame 1. A screw press 4 is rotatably connected to the inner wall of the pressing chamber 2. A slot 5 is opened on one side of the frame 1, and an L-shaped support plate 6 is fixedly connected to one side of the frame 1. One end of the screw press 4 extends through the slot 5 and out of the frame 1, rotatably connected to the support plate 6. An adjusting frame 7 is rotatably connected to the outer circumference of one end of the pressing chamber 2. The adjusting frame 7 is fixedly connected to the screw press 4. A feeding groove 8 is opened on the surface of the pressing chamber 2. Multiple feeding troughs 9 are provided on the outer circumferential surface of the machine frame 1. The feeding trough 8 is positioned corresponding to the adjacent feeding trough 9. A feeding cylinder 10 with a conical bottom is fixedly installed on the inner wall of the frame 1. The feeding cylinder 10 contacts the outer circumferential surface of the adjusting frame 7, and the bottom end of the feeding cylinder 10 is designed to fit the outer surface of the adjusting frame 7. The design of the bottom end of the feeding cylinder 10 fitting the outer surface of the adjusting frame 7 ensures that the feeding cylinder 10 and the adjusting frame 7 fit tightly, preventing peanut leakage during feeding and ensuring the stability and accuracy of feeding.

[0024] The adjusting frame 7 is equipped with an adjusting component 11, which is used to adjust the amount of peanuts entering from the feed trough 8.

[0025] The frame 1 is equipped with a post-processing component 12, which is used to improve the purity of peanut oil after pressing and to dry peanut impurities after pressing.

[0026] The screw press 4 has a cavity 13 formed along its axial direction. A cooling component 14 is installed inside the cavity 13 to cool the screw press 4 and extend its service life.

[0027] The adjustment assembly 11 includes multiple grooves 1101 formed on the outer circumference of the adjustment frame 7. Each groove 1101 is slidably connected to an adjustment plate 1102 via a self-locking slide rail. Each adjustment plate 1102 has a connecting hole 1103 on its outer surface. The self-locking slide rail is a sliding track device with an automatic locking function, which can automatically fix itself in a specific position, such as when fully extended or closed, to prevent accidental sliding or movement. The adjustment plate 1102 is used in conjunction with the connecting hole 1103 formed on its surface. When the adjustment plate 1102 is slid, the relative position of the connecting hole 1103 with the feed trough 8 and the feeding trough 9 can be changed, thereby adjusting the amount of peanuts entering the pressing chamber 2 from the feed trough 8 to meet different pressing requirements.

[0028] The post-processing assembly 12 includes two processing cylinders 1201 fixedly connected to the inner wall of the frame 1. Rotating rods 1202 are rotatably connected to the inner walls of both processing cylinders 1201. Feeding augers 1203 are fixedly connected to the outer surfaces of both rotating rods 1202. A resistance heating plate 1204 is fixedly mounted on the outer surface of one processing cylinder 1201. The resistance heating plate 1204 is a heating device that generates heat by passing current through a resistive material. It is widely used in industrial, commercial, and civilian fields; that is, when current passes through the resistor, electrical energy is converted into heat energy. A discharge frame 1205 is fixedly connected to the outer surface of the other processing cylinder 1201. A filter screen 1206 is installed on the inner wall of the discharge frame 1205, passing through the frame 1. The filter screen 1206 contacts the adjacent feeding auger 1203. The contact between the feeding auger 1203 and the filter screen 1206 can clean the filter screen 1206 during rotation, preventing the filter screen 1206 from clogging and ensuring the filtration effect. Two processing cylinders 1201 are set up to process the pressed peanut oil and impurities in different ways. One processing cylinder 1201 can filter the peanut oil through the filter screen 1206, thereby improving the purity of the peanut oil. The other processing cylinder 1201 can dry the peanut impurities after pressing, which is convenient for subsequent feed production.

[0029] The two rotating rods 1202 are connected to the belt drive via pulleys at one end. One end of one of the rotating rods 1202 is fixedly connected to the output end of an external motor. The bottom end of the receiving frame 3 is fixedly connected to the adjacent processing cylinder 1201 via a pipe. The belt drive can realize the synchronous rotation of the two rotating rods 1202, ensuring the stable operation of the post-processing component 12. At the same time, the receiving frame 3 is connected to the processing cylinder 1201, which facilitates the direct transport of pressed peanut oil and impurities to the processing cylinder 1201 for processing. An inclined plate 15 is installed on the inner wall of the frame 1, and a vibration motor 16 is fixedly installed on the inner wall of the frame 1. The output end of the vibration motor 16 is fixedly connected to the inclined plate 15. A collection frame 17 is fixedly installed on the upper surface of the frame 1. The bottom end of the collection frame 17 is located inside the frame 1. An inlet groove 18 is opened on the surface of the processing cylinder 1201 adjacent to the inclined plate 15. The vibration motor 16 drives the inclined plate 15 to vibrate, which can make the peanut impurities falling on the inclined plate 15 enter the adjacent processing cylinder 1201 through vibration, so as to facilitate the collection and processing of impurities.

[0030] The cooling component 14 includes a connecting rod 1401. One end of the connecting rod 1401 is threaded to the inner wall of the cavity 13. A flow guide auger 1402 is fixedly connected to the circumferential surface of the connecting rod 1401. The flow guide auger 1402 can guide the coolant to flow in the cavity 13, increase the contact area between the coolant and the screw press 4, and enhance the cooling effect. A concave groove 1403 is formed on the outer circumferential surface of the screw press 4 near the feed cylinder 10. Multiple flow holes 1404 communicating with the cavity 13 are opened on the inner wall of the concave groove 1403. A sealing ring 1405 is rotatably connected to the inner wall of the concave groove 1403 through a sealing bearing. A return pipe 1406 is fixedly connected to the outer circumferential surface of the sealing ring 1405. The return pipe 1406 is fixedly connected to an external liquid storage device. One end of the connecting rod 1401 has an L-shaped opening. The water inlet trough 1407 has one end connected to the cavity 13, and the other end connected to the external water supply pipe through a rotary connector. The rotary connector is a device that allows fluid liquid or gas to be continuously transferred between rotating and stationary parts while maintaining a seal to prevent leakage. The cooling component 14 can cool the screw 4 in time through the flow of water, preventing the screw 4 from deforming or being damaged due to excessive temperature, ensuring the normal operation of the pressing device, and extending the service life of the equipment. The inner wall of the frame 1 is equipped with a drive motor 19, and the output end of the drive motor 19 is fixedly connected to one end of the screw 4. The drive motor 19 provides power for the rotation of the screw 4, enabling the screw 4 to rotate normally in the pressing chamber 2 to realize the peanut pressing process.

[0031] The working principle of the above embodiment is as follows: First, when pressing peanuts for oil, the adjusting plate 1102 inside the sliding chute 1101 is limited by the self-locking slide rail. When the adjusting plate 1102 slides, the connecting hole 1103 can be blocked. By adjusting the degree of blocking of the connecting hole 1103, the effective communication area between the connecting hole 1103 and the feeding chute 8 and the feeding chute 9 can be changed, thereby controlling the feed amount of peanuts. When the drive motor 19 drives the screw 4 to rotate, the screw 4 can drive the adjusting frame 7 to rotate. Through the rotation of the adjusting frame 7, indirect feeding is achieved, thereby meeting the diverse pressing production needs.

[0032] During the pressing of peanuts by the screw press 4, the external pump delivers water to the rotary connector through the water supply pipe, which then enters the water inlet tank 1407 and flows into the cavity 13. The guide auger 1402 contacts the inner wall of the cavity 13. The guide auger 1402 guides the coolant to flow in a spiral shape within the cavity 13, allowing the coolant to flow fully along the axial and circumferential directions of the screw press 4. This greatly increases the contact area between the coolant and the screw press 4, enhancing the heat exchange effect and achieving efficient cooling of the screw press 4. Subsequently, the water flows through the flow hole 1404 into the concave groove 1403 and returns to the external water storage device through the return ring.

[0033] During the pressing process, peanut oil flows through the pressing chamber 2 into the receiving frame 3 and then enters the corresponding processing cylinder 1201 through the pipe. At this time, an external motor drives one of the rotating rods 1202 to rotate. Through the transmission of the belt, the two rotating rods 1202 can rotate synchronously. During the rotation of one of the rotating rods 1202, the peanut oil can be pushed to flow in the adjacent processing cylinder 1201. When the peanut oil passes through the filter screen 1206, it will be filtered by the filter screen 1206 and flow into the discharge frame 1205 and discharged through the discharge frame 1205. The impurities retained on the filter screen 1206 will be pushed out by the feeding auger 1203.

[0034] After pressing, peanut impurities fall through the trough 5 into the collection frame 17, and then through the collection frame 17 onto the inclined plate 15 inside the frame 1. At this time, the vibration motor 16 starts and transmits vibration to the inclined plate 15, causing the residue on the inclined plate 15 to enter the corresponding processing cylinder 1201 due to the vibration. At this time, the resistance heating plate 1204 is energized and generates heat. During the rotation of the rotating rod 1202, the peanut residue will drive the corresponding feeding auger 1203 to transport the peanut residue. Under the action of gravity, the peanut residue will contact the bottom of the processing cylinder 1201, and under the push of the feeding auger 1203, it will be evenly heated, which will facilitate its subsequent processing into feed.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0036] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-oleic peanut oil pressing device, comprising a frame (1), a pressing chamber (2), and a receiving frame (3), characterized in that: The receiving frame (3) is fixedly connected to the frame (1). The inner wall of the pressing chamber (2) is rotatably connected to the screw (4). A slot (5) is opened on one side of the frame (1). An L-shaped support plate (6) is fixedly connected to one side of the frame (1). One end of the screw (4) extends through the slot (5) and out of the frame (1) and is rotatably connected to the support plate (6). An adjusting frame (7) is rotatably connected to the outer circumference of one end of the pressing chamber (2). The adjusting frame (7) is fixedly connected to the screw (4). The pressing chamber (2) is connected to the feed trough (8) on its surface. The outer circumferential surface of the adjusting frame (7) is provided with multiple feed troughs (9) distributed in a circular pattern. The feed trough (8) is positioned in relation to the adjacent feed trough (9). The inner wall of the frame (1) is fixedly installed with a feed cylinder (10) with a conical bottom end. The feed cylinder (10) contacts the outer circumferential surface of the adjusting frame (7), and the bottom end of the feed cylinder (10) is set to a shape that matches the outer surface of the adjusting frame (7). The adjustment frame (7) is equipped with an adjustment component (11); The rack (1) is equipped with a post-processing component (12); The screw press (4) has a cavity (13) formed along its axial direction inside, and a cooling component (14) is provided inside the cavity (13).

2. The high oleic acid peanut oil pressing device according to claim 1, characterized in that: The adjustment component (11) includes multiple slide grooves (1101) on the outer circumferential surface of the adjustment frame (7). Each slide groove (1101) is slidably connected to an adjustment plate (1102) via a self-locking slide rail. Each adjustment plate (1102) has a connecting hole (1103) on its outer surface.

3. The high oleic acid peanut oil pressing device according to claim 1, characterized in that: The post-processing assembly (12) includes two processing cylinders (1201) fixedly connected to the inner wall of the frame (1). The inner walls of the two processing cylinders (1201) are rotatably connected to rotating rods (1202). The outer surfaces of the two rotating rods (1202) are fixedly connected to feeding augers (1203). A resistance heating plate (1204) is fixedly installed on the outer surface of one processing cylinder (1201), and a discharge frame (1205) is fixedly connected to the outer surface of the other processing cylinder (1201). The discharge frame (1205) passes through the frame (1), and a filter screen (1206) is installed on the inner wall of the discharge frame (1205). The filter screen (1206) contacts the adjacent feeding auger (1203).

4. The high oleic acid peanut oil pressing device according to claim 3, characterized in that: The two rotating rods (1202) are connected to the belt drive at one end of adjacent parts via pulleys. One end of one of the rotating rods (1202) is fixedly connected to the output end of an external motor. The bottom end of the receiving frame (3) is fixedly connected to the adjacent processing cylinder (1201) via a pipe.

5. The high oleic acid peanut oil pressing device according to claim 3, characterized in that: An inclined plate (15) is installed on the inner wall of the frame (1). A vibration motor (16) is fixedly installed on the inner wall of the frame (1). The output end of the vibration motor (16) is fixedly connected to the inclined plate (15). A collection frame (17) is fixedly installed on the upper surface of the frame (1). The bottom end of the collection frame (17) is located inside the frame (1). An inlet groove (18) is opened on the surface of the processing cylinder (1201) adjacent to the inclined plate (15).

6. The high oleic acid peanut oil pressing device according to claim 1, characterized in that: The cooling component (14) includes a connecting rod (1401), one end of which is threaded to the inner wall of the cavity (13). A flow guide auger (1402) is fixedly connected to the circumferential surface of the connecting rod (1401). A concave groove (1403) is formed on the outer circumferential surface of the screw press (4) near the feed cylinder (10). The inner wall of the concave groove (1403) is provided with multiple flow holes (1404) communicating with the cavity (13). The inner wall is rotatably connected to a sealing ring (1405) via a sealing bearing. The outer circumference of the sealing ring (1405) is fixedly connected to a return pipe (1406). The return pipe (1406) is fixedly connected to an external liquid storage device. One end of the connecting rod (1401) is provided with an L-shaped water inlet groove (1407). One end of the water inlet groove (1407) is connected to the cavity (13), and the other end of the water inlet groove (1407) is connected to an external water supply pipe via a rotating connector.

7. The high oleic acid peanut oil pressing device according to claim 1, characterized in that: The inner wall of the frame (1) is equipped with a drive motor (19), and the output end of the drive motor (19) is fixedly connected to one end of the screw press (4).

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