Oil injection pump

Abstract

The utility model discloses an oil injection pump, and relates to the technical field of oil injection equipment. The oil injection pump comprises an oil pump shell, a ball screw is arranged in the oil pump shell, the ball screw is in threaded connection with a lead screw nut, and the lead screw nut is in sliding connection with the inner bottom face of the oil pump shell; the two ends of the oil pump shell are provided with openings and connected with an oil pump cylinder body and a servo motor respectively, the oil pump cylinder body is provided with an oil cylinder cavity communicated with the oil pump shell, the oil cylinder cavity is provided with a ceramic core in sliding connection, the ceramic core is fixedly connected with the lead screw nut, the upper end of the oil pump cylinder body is provided with an oil outlet connector communicated with the oil cylinder cavity, and an oil outlet one-way valve is arranged in the oil outlet connector. An oil inlet joint communicated with the oil cylinder cavity is arranged at the lower end of the oil pump cylinder body; an oil inlet one-way valve is arranged in the oil inlet joint; and an output shaft of the servo motor is fixedly connected with the ball screw. The oil injection pump can automatically adjust the oil injection amount and is high in precision, good in stability and low in noise.

Description

Technical Field

[0001] The utility model relates to the technical field of oil injection equipment, in particular to an oil injection pump. Background Art

[0002] An automatic e-liquid refilling machine is an automated device that can quickly refill e-liquid bottles and electronic atomizer e-liquid containers. It is usually composed of a e-liquid tank, a refilling pump, and a e-liquid refill port. The refilling pump is the core component of the e-liquid refilling machine. When the e-liquid refilling machine is working, the refilling pump will draw the e-liquid from the e-liquid tank into the oil storage chamber of the pump body, and then inject the e-liquid from the oil storage chamber into the e-liquid bottle or electronic atomizer e-liquid container.

[0003] In the prior art, Chinese patent document CN216674683U discloses an electronic cigarette refueling pump with adjustable refueling volume. The pump comprises a drive mechanism, a support member, and a refueling mechanism. The drive mechanism and the refueling mechanism are respectively connected to the support member, which is provided with an oil inlet, an oil outlet, and an oil storage chamber. The drive mechanism comprises a cylinder, and the refueling mechanism comprises a refueling member and a connecting rod. The movement of the cylinder is used to drive the connecting rod and the refueling member. The refueling pump has an adjustment mechanism provided on the support member. The adjustment mechanism comprises an adjustment rod. Whenever the refueling volume of the refueling pump needs to be adjusted, the user must manually rotate the adjustment rod to change the length of the adjustment rod extending into the oil storage chamber, thereby changing the movement stroke of the refueling member within the oil storage chamber to adjust the refueling volume, which reduces production efficiency. In addition, the drive mechanism is a cylinder. Due to the influence of factors such as friction and air pressure fluctuations, the operating accuracy and stability of the cylinder are relatively low. In addition, cylinder-type refueling pumps generate a lot of noise during operation. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide an oil injection pump which can automatically adjust the oil injection amount, has high precision, good stability and low noise.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] An oil injection pump comprises an oil pump housing, a ball screw is provided in the oil pump housing, a screw nut is threadedly connected to the ball screw, and the screw nut is slidably connected to the bottom surface of the oil pump housing; openings are provided at both ends of the oil pump housing and are respectively connected to an oil pump cylinder body and a servo motor, the oil pump cylinder body is provided with an oil cylinder cavity connected to the oil pump housing, the oil cylinder cavity is provided with a slidingly connected ceramic core, the ceramic core is fixedly connected to the screw nut, an oil outlet joint connected to the oil cylinder cavity is provided at the upper end of the oil pump cylinder body, an oil outlet check valve is provided in the oil outlet joint, an oil inlet joint is provided at the lower end of the oil pump cylinder body, an oil inlet check valve is provided in the oil inlet joint; the output shaft of the servo motor is fixedly connected to the ball screw.

[0007] In some embodiments, an oil outlet cylinder cover is provided between the oil outlet joint and the oil pump cylinder body, the oil outlet cylinder cover is provided with an oil outlet, and the oil outlet is provided with an oil outlet sealing assembly; an oil outlet sealing sleeve is coaxially provided in the inner cavity of the oil outlet joint, the oil outlet sealing sleeve abuts against the top of the oil outlet sealing assembly, a first spring is coaxially provided in the oil outlet sealing sleeve, and the upper end of the first spring is fixedly connected to the upper end of the inner cavity of the oil outlet joint; a first shaft ring is provided on the oil outlet one-way valve, the oil outlet one-way valve passes through the first spring, and the upper end of the first shaft ring abuts against the lower end of the first spring, and the lower end abuts against the oil outlet sealing assembly.

[0008] In some embodiments, an oil inlet cylinder cover is provided between the oil inlet joint and the oil pump cylinder body, and an oil inlet port is provided on the oil inlet cylinder cover; an oil inlet sealing assembly and an oil inlet sealing sleeve are coaxially provided in the oil inlet joint, the oil inlet sealing assembly is provided at the lower end of the inner cavity of the oil inlet joint, the oil inlet sealing sleeve abuts against the top of the oil inlet sealing assembly, a second spring is coaxially provided in the oil inlet sealing sleeve, and the upper end of the second spring is fixedly connected to the oil inlet port; a second shaft ring is provided on the oil inlet one-way valve, the oil inlet one-way valve passes through the second spring, and the upper end of the second shaft ring abuts against the lower end of the second spring, and the lower end abuts against the oil inlet sealing assembly.

[0009] Compared with the prior art, the present invention achieves at least the following beneficial effects:

[0010] The driving mechanism of the utility model adopts a servo motor, a ball screw and a screw nut. The servo motor drives the ball screw to rotate, and the screw nut can move back and forth along the bottom surface of the oil pump housing, thereby driving the ceramic core to move back and forth along the oil cylinder cavity, forming a positive pressure or negative pressure environment inside the oil pump cylinder body, thereby completing the oil filling and oil extraction actions. When extracting oil, the smoke oil is drawn from the smoke oil box of the oil filling machine into the oil cylinder cavity, and when filling oil, the smoke oil in the oil cylinder cavity is injected into the smoke cartridge through the oil filling pipe; the utility model can control the rotation angle and rotation direction of the servo motor through the servo driver, thereby automatically adjusting the position of the screw nut, changing the position of the ceramic core in the oil cylinder cavity, so that the movement stroke of the ceramic core in the oil cylinder cavity changes. The shorter the length of the ceramic core extending into the oil cylinder cavity, the greater the oil storage capacity of the oil cylinder cavity, and different capacities of oil filling actions can be completed; and the ceramic core can achieve high-precision displacement and speed control through ball screw transmission and servo motor control. Compared with the cylinder drive method, the utility model runs more smoothly and has less noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] One or more embodiments of the present invention will now be described, by way of example only, with reference to the accompanying drawings, in which:

[0012] Figure 1 This is a schematic structural diagram of one embodiment of the present utility model;

[0013] Figure 2 for Figure 1 a cross-sectional view of an embodiment;

[0014] Figure 3 for Figure 1 An exploded view of an embodiment;

[0015] Figure 4 for Figure 1 Cross-sectional view of the oil outlet connector and the oil inlet connector of the embodiment.

[0016] The numbers in the figure are: 1, oil pump housing; 11, cylinder connecting plate; 2, ball screw; 3, screw nut; 4, oil pump cylinder; 41, oil cylinder chamber; 42, cylinder sealing cover; 5, servo motor; 6, ceramic core; 7, oil outlet joint; 71, oil outlet sealing sleeve; 8, oil outlet check valve; 81, first shaft ring; 9, oil inlet joint; 91, oil inlet sealing sleeve; 10, oil inlet check valve; 101, second shaft ring; 20, oil outlet cylinder cover; 30, oil outlet seal Seal assembly; 40, first spring; 50, oil inlet cylinder cover; 60, oil inlet seal assembly; 70, second spring; 80, nut mounting seat; 801, connecting shaft; 90, linear guide; 901, slider; 100, photoelectric proximity switch; 200, acrylic sheet; 300, sensor block; 400, bearing seat; 500, coupling; 600, limit block; 700, ceramic core seal assembly; 710, second sealing ring; 720, spring oil seal. DETAILED DESCRIPTION

[0017] The present invention will be described in detail below with reference to the exemplary embodiments in the accompanying drawings. However, it should be understood that the present invention can be implemented in a variety of different forms and should not be construed as being limited to the embodiments described herein. These embodiments are provided herein to make the disclosure of the present application more complete and to fully convey the concepts of the present application to those skilled in the art.

[0018] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting this application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, "several" and "multiple" mean two or more, unless otherwise clearly and specifically defined. In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they can refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. A person skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances. In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them. Furthermore, "above," "above," and "above" a first feature may include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher level than the second feature. "Below," "below," and "below" a first feature may include the first feature being directly below or diagonally below the second feature, or simply indicate that the first feature is at a lower level than the second feature.

[0019] like Figures 1 to 4As shown, in one embodiment of the present invention, the oil injection pump includes an oil pump housing 1, a ball screw 2 is provided in the oil pump housing 1, a screw nut 3 is threadedly connected to the ball screw 2, and the screw nut 3 is slidably connected to the bottom surface of the oil pump housing 1; openings are provided at both ends of the oil pump housing 1 and are respectively connected to an oil pump cylinder 4 and a servo motor 5, the oil pump cylinder 4 is provided with an oil cylinder cavity 41 communicating with the oil pump housing 1, and the oil cylinder cavity 41 is provided with a slidingly connected ceramic core 6. Compared with pump cores made of other materials, the ceramic core 6 has better durability and service life and can resist chemicals The ceramic core 6 is fixedly connected to the screw nut 3, and the upper end of the oil pump cylinder body 4 is provided with an oil outlet joint 7 connected to the oil cylinder cavity 41. The oil outlet joint 7 is provided with an oil outlet check valve 8. The lower end of the oil pump cylinder body 4 is provided with an oil inlet joint 9 connected to the oil cylinder cavity 41, and the oil inlet joint 9 is provided with an oil inlet check valve 10. The output shaft of the servo motor 5 is fixedly connected to the ball screw 2. The servo motor 5 can be controlled by the servo driver, so as to accurately adjust the rotation angle, rotation direction and other parameters of the servo motor 5.

[0020] An oil outlet cylinder cover 20 is provided between the oil outlet joint 7 and the oil pump cylinder body 4. The oil outlet cylinder cover 20 is provided with an oil outlet, and the oil outlet is provided with an oil outlet sealing assembly 30; an oil outlet sealing sleeve 71 is coaxially provided in the inner cavity of the oil outlet joint 7, and the oil outlet sealing sleeve 71 abuts against the top of the oil outlet sealing assembly 30. A first spring 40 is coaxially provided in the oil outlet sealing sleeve 71, and the upper end of the first spring 40 is fixedly connected to the upper end of the inner cavity of the oil outlet joint 7; a first shaft ring 81 is provided on the oil outlet one-way valve 8, and the oil outlet one-way valve 8 passes through the first spring 40, and the upper end of the first shaft ring 81 abuts against the lower end of the first spring 40, and the lower end abuts against the oil outlet sealing assembly 30, thereby realizing the closure of the oil outlet joint 7.

[0021] An oil inlet cylinder cover 50 is provided between the oil inlet joint 9 and the oil pump cylinder body 4, and an oil inlet port is provided on the oil inlet cylinder cover 50; an oil inlet sealing assembly 60 and an oil inlet sealing sleeve 91 are coaxially provided in the oil inlet joint 9, the oil inlet sealing assembly 60 is provided at the lower end of the inner cavity of the oil inlet joint 9, the oil inlet sealing sleeve 91 abuts against the top of the oil inlet sealing assembly 60, a second spring 70 is coaxially provided in the oil inlet sealing sleeve 91, and the upper end of the second spring 70 is fixedly connected to the oil inlet port; a second shaft ring 101 is provided on the oil inlet one-way valve 10, the oil inlet one-way valve 10 passes through the second spring 70, and the upper end of the second shaft ring 101 abuts against the lower end of the second spring 70, and the lower end abuts against the oil inlet sealing assembly 60, thereby realizing the closure of the oil inlet joint 9.

[0022] Optionally, a nut mounting seat 80 is sleeved on the lead screw nut 3 and fixedly connected to the lead screw nut 3. A connecting shaft 801 is provided on the nut mounting seat 80 and fixedly connected to the ceramic core 6. A linear guide 90 is provided on the inner bottom surface of the oil pump housing 1, and a slider 901 of the linear guide 90 is fixedly connected to the nut mounting seat 80. The connecting shaft 801 is fixedly connected to the ceramic core 6 via a connecting nut, and a connecting ring is provided between the ceramic core 6 and the connecting nut.

[0023] Optionally, a cylinder connection plate 11 is provided at one end of the oil pump housing 1 near the oil pump cylinder 4. A photoelectric proximity switch 100 is located on top of the cylinder connection plate 11, and an acrylic sheet 200 is provided on the outer side of the photoelectric proximity switch 100. A sensor block 300 that matches the photoelectric proximity switch 100 is located on top of the nut mounting base 80. The sensor block 300 and the photoelectric proximity switch 100 work together to locate the zero point of the nut mounting base 80's travel and prevent the servo motor 5 from overshooting in unexpected situations.

[0024] Optionally, a bearing seat 400 and a coupling 500 are provided between the ball screw 2 and the output shaft of the servo motor 5. The ball screw 2 passes through the bearing seat 400, and the exit end is connected to the output shaft of the servo motor 5 via the coupling 500. Furthermore, a stop block 600 is provided below the bearing seat 400. The stop block 600 is fixedly connected to the inner bottom surface of the oil pump housing 1 and is used to limit the rear position of the screw nut 3.

[0025] Optionally, the oil outlet sealing assembly 30 and the oil inlet sealing assembly 60 both include a first sealing ring, and a sealing ring is provided between the first sealing ring and the inner cavity side wall of the oil outlet joint 7 or the oil inlet joint 9; the oil outlet one-way valve 8 and the oil inlet one-way valve 10 respectively pass downward through the oil outlet sealing assembly 30 and the oil inlet sealing assembly 60, and a sealing ring is provided between the oil outlet one-way valve 8 and the inner wall of the oil outlet sealing assembly 30, and a sealing ring is also provided between the oil inlet one-way valve 10 and the inner wall of the oil inlet sealing assembly 60, thereby improving the sealing performance of the oil outlet joint 7 and the oil inlet joint 9.

[0026] Optionally, a cylinder sealing cover 42 is provided at one end of the oil pump cylinder 4, adjacent to the oil pump housing 1. The ceramic core 6 passes through the cylinder sealing cover 42, and a ceramic core sealing assembly 700 is provided between the ceramic core 6, the oil cylinder cavity 41, and the cylinder sealing cover 42. Furthermore, the ceramic core sealing assembly 700 includes a second sealing ring 710 and a spring oil seal 720. The second sealing ring 710 and the spring oil seal 720 are coaxially sleeved on the ceramic core 6, with the spring oil seal 720 located at both ends of the second sealing ring 710. Seal rings are provided between the second sealing ring 710, the oil cylinder cavity 41, and the cylinder sealing cover 42, thereby improving the sealing performance of the oil pump cylinder 4.

[0027] Optionally, an oil outlet nut is provided at the outer end of the oil outlet joint 7. When the oil filling pipe is connected to the oil outlet joint 7, the oil outlet nut is used to fix the oil filling pipe to prevent the oil filling pipe from accidentally falling off during the oil filling process.

[0028] The method of using the oil injection pump is:

[0029] When pumping oil, the servo motor 5 rotates forward to drive the ball screw 2 to rotate, and the screw nut 3 moves backward. The nut mounting seat 80, connecting nut, connecting ring, and connecting shaft 801 connected to the screw nut 3 drive the ceramic core 6 to move backward along the cylinder cavity 41, and then a negative pressure environment is formed inside the oil pump cylinder body 4, so that the oil outlet check valve 8 and the oil inlet check valve 10 both move toward the oil pump cylinder body 4. The oil outlet check valve 8 fits tightly with the oil outlet sealing assembly 30, sealing the oil outlet at the oil outlet cylinder cover 20, and the oil inlet check valve 10 moves away from the oil inlet sealing assembly 60 and presses the second spring 70 upward. A gap appears between the oil inlet check valve 10 and the oil inlet sealing assembly 60, so that oil can flow into the oil pump cylinder body 4 from the lower oil inlet joint 9 and the oil inlet check valve 10. When the oil volume reaches the set amount, the servo motor 5 stops rotating;

[0030] When filling oil, the servo motor 5 reverses to drive the ball screw 2 to rotate, and the screw nut 3 moves forward. The nut mounting seat 80, connecting nut, connecting ring, and connecting shaft 801 connected to the screw nut 3 drive the ceramic core 6 to move forward along the cylinder cavity 41, and then a positive pressure environment is formed inside the oil pump cylinder body 4, so that the oil outlet check valve 8 and the oil inlet check valve 10 are both moved away from the oil pump cylinder body 4. On the contrary, the oil inlet check valve 10 and the oil inlet sealing assembly 60 fit tightly, and the oil outlet check valve 8 moves away from the oil outlet sealing assembly 30 and squeezes the first spring 40. A gap appears between the oil outlet check valve 8 and the oil outlet sealing assembly 30, and the ceramic core 6 squeezes the oil inside the oil pump cylinder body 4. The oil can flow from the oil outlet joint 7 and thus flow into the oil filling pipeline.

[0031] Repeat the above two steps to achieve oil filling operations of different capacities.

[0032] It should be understood that all the above embodiments are illustrative rather than restrictive. Any modifications, equivalent changes and modifications made by those skilled in the art to the specific embodiments described above under the concept of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An oil injection pump, characterized in that: The invention comprises an oil pump housing (1), wherein a ball screw (2) is provided in the oil pump housing (1), a screw nut (3) is threadedly connected to the ball screw (2), and the screw nut (3) is slidably connected to the inner bottom surface of the oil pump housing (1); openings are provided at both ends of the oil pump housing (1) and are respectively connected to an oil pump cylinder (4) and a servo motor (5); the oil pump cylinder (4) is provided with an oil cylinder cavity (41) communicating with the oil pump housing (1), and the oil cylinder cavity (41) is provided with a ceramic screw nut (3) slidably connected to the inner bottom surface of the oil pump housing (1); The ceramic core (6) is fixedly connected to the screw nut (3); the upper end of the oil pump cylinder body (4) is provided with an oil outlet joint (7) communicating with the oil cylinder cavity (41); an oil outlet check valve (8) is provided in the oil outlet joint (7); the lower end of the oil pump cylinder body (4) is provided with an oil inlet joint (9) communicating with the oil cylinder cavity (41); an oil inlet check valve (10) is provided in the oil inlet joint (9); and the output shaft of the servo motor (5) is fixedly connected to the ball screw (2).

2. The oil injection pump according to claim 1, characterized in that: An oil outlet cylinder cover (20) is provided between the oil outlet joint (7) and the oil pump cylinder body (4), the oil outlet cylinder cover (20) is provided with an oil outlet, and the oil outlet is provided with an oil outlet sealing assembly (30); an oil outlet sealing sleeve (71) is coaxially provided in the inner cavity of the oil outlet joint (7), the oil outlet sealing sleeve (71) abuts against the upper part of the oil outlet sealing assembly (30), a first spring (40) is coaxially provided in the oil outlet sealing sleeve (71), the upper end of the first spring (40) is fixedly connected to the upper end of the inner cavity of the oil outlet joint (7); a first shaft ring (81) is provided on the oil outlet one-way valve (8), the oil outlet one-way valve (8) passes through the first spring (40), and the upper end of the first shaft ring (81) abuts against the lower end of the first spring (40), and the lower end abuts against the oil outlet sealing assembly (30).

3. The oil injection pump according to claim 2, characterized in that: An oil inlet cylinder cover (50) is provided between the oil inlet joint (9) and the oil pump cylinder body (4), and an oil inlet port is provided on the oil inlet cylinder cover (50); an oil inlet sealing assembly (60) and an oil inlet sealing sleeve (91) are coaxially provided in the oil inlet joint (9), the oil inlet sealing assembly (60) is provided at the lower end of the inner cavity of the oil inlet joint (9), the oil inlet sealing sleeve (91) abuts against the upper part of the oil inlet sealing assembly (60), a second spring (70) is coaxially provided in the oil inlet sealing sleeve (91), and the upper end of the second spring (70) is fixedly connected to the oil inlet port; a second shaft ring (101) is provided on the oil inlet check valve (10), the oil inlet check valve (10) passes through the second spring (70), and the upper end of the second shaft ring (101) abuts against the lower end of the second spring (70), and the lower end abuts against the oil inlet sealing assembly (60).

4. The oil injection pump according to claim 1, characterized in that: A nut mounting seat (80) is sleeved on the screw nut (3), the nut mounting seat (80) is fixedly connected to the screw nut (3), and a connecting shaft (801) fixedly connected to the ceramic core (6) is provided on the nut mounting seat (80); a linear guide rail (90) is provided on the inner bottom surface of the oil pump housing (1), and a slider (901) of the linear guide rail (90) is fixedly connected to the nut mounting seat (80).

5. The oil injection pump according to claim 4, characterized in that: A cylinder connecting plate (11) is provided at one end of the oil pump housing (1) close to the oil pump cylinder (4); a photoelectric proximity switch (100) is provided on the top of the cylinder connecting plate (11); an acrylic sheet (200) is provided on the outside of the photoelectric proximity switch (100); and a sensing block (300) matching the photoelectric proximity switch (100) is provided on the top of the nut mounting seat (80).

6. The oil injection pump according to claim 1, characterized in that: A bearing seat (400) and a coupling (500) are provided between the ball screw (2) and the output shaft of the servo motor (5); the ball screw (2) passes through the bearing seat (400), and the protruding end is connected to the output shaft of the servo motor (5) through the coupling (500).

7. The oil injection pump according to claim 6, characterized in that: A limiting block (600) is provided below the bearing seat (400). The limiting block (600) is fixedly connected to the inner bottom surface of the oil pump housing (1) and is used to limit the position of the screw nut (3).

8. The oil injection pump according to claim 2, characterized in that: The oil outlet sealing assembly (30) and the oil inlet sealing assembly (60) both comprise a first sealing ring, wherein a sealing ring is provided between the first sealing ring and the inner cavity of the oil outlet joint (7) or the oil inlet joint (9); a sealing ring is provided between the oil outlet one-way valve (8) and the oil outlet sealing assembly (30), and a sealing ring is provided between the oil inlet one-way valve (10) and the oil inlet sealing assembly (60).

9. The oil injection pump according to claim 1, characterized in that: A cylinder sealing cover (42) is provided at one end of the oil pump cylinder (4) close to the oil pump housing (1); the ceramic core (6) passes through the cylinder sealing cover (42), and a ceramic core sealing assembly (700) is provided between the ceramic core (6), the oil cylinder cavity (41) and the cylinder sealing cover (42).

10. The oil injection pump according to claim 9, characterized in that: The ceramic core sealing assembly (700) comprises a second sealing ring (710) and a spring oil seal (720). The second sealing ring (710) and the spring oil seal (720) are coaxially sleeved on the ceramic core (6), and the spring oil seal (720) is arranged at both ends of the second sealing ring (710). A sealing ring is provided between the second sealing ring (710) and the cylinder cavity (41) and the cylinder body sealing cover (42).

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