Dynamometric brake

Abstract

The present invention relates to a force-measuring brake, the structure of which includes a base and a brake arm hinged to the base via a brake arm shaft. The axial hole on the base for receiving the brake arm shaft is an oblong hole opened along the length of the brake arm. The base is also provided with a pin hole, in which a pin sensor is connected. A connecting plate is provided in the lower gap of the brake arm. The pin sensor and the brake arm shaft are each connected to a circular through-hole on the connecting plate. The spacing between the two circular through-holes on the connecting plate is such that the axis of the brake arm shaft in a static state is located at the longitudinal center of the through-hole. The present invention can detect the braking friction and braking torque of the brake in real time, and can promptly issue fault warning information to remind supervisors and maintenance personnel to adopt countermeasures to ensure the safe use of the lifting equipment.

Description

Technical Field

[0001] The present invention relates to a drum brake, in particular to a dynamometer brake capable of detecting the braking friction force of the brake. Background Art

[0002] Patent No. CN108373089A, previously filed by the applicant, discloses a hub brake braking torque true value detection sensor and a braking torque true value detection method. The braking torque true value detection sensor comprises a base plate for fixing to the brake base and a tension and compression sensor attached to the base plate. The base plate is divided into a suspended extension portion with a suspended bottom edge and a fixed connection portion fixedly connected to the brake base. The suspended extension portion is provided with a transverse through-hole for passing through the brake arm hinge shaft to convert the vertical force generated by the brake arm during braking into a tension and compression force on the base plate through the brake arm hinge shaft. The tension and compression sensor is attached to the suspended extension portion of the base plate between the transverse through-hole and the fixed connection portion to detect the tension and compression force applied to the base plate. Combined with the geometric dimensions of the brake drum on the lifting equipment on which the drum brake is installed, the true value of the drum brake's braking torque can be calculated.

[0003] This patent provides a new method for real-time detection of brake torque. However, the structure of this braking torque true value detection sensor is somewhat complicated and its installation on the brake is inconvenient. Summary of the Invention

[0004] The purpose of the present invention is to provide a force measuring brake to solve the problems of complex structure and inconvenient installation of the brake torque true value detection sensor.

[0005] The present invention is implemented as follows: a force measuring brake includes a base and a brake arm hinged to the base through a brake arm shaft, the axial hole on the base for passing the brake arm shaft is an oblong hole opened along the length of the brake arm, and a pin shaft hole is also opened on the base, a pin shaft sensor is passed through the pin shaft hole, and a connecting plate is provided in the lower gap of the brake arm, the pin shaft sensor and the brake arm shaft are respectively passed through a circular through hole on the connecting plate, and the spacing between the two circular through holes on the connecting plate is such that the axis center of the brake arm shaft in static state is located at the center position of the length of the axial hole.

[0006] Furthermore, the connecting plate is used to transmit the braking friction force transmitted through the brake arm to the pin sensor, and the pin sensor is used to convert the force information into an electrical signal and send it outward.

[0007] Furthermore, the centers of the two circular through-holes on the connecting plate are located on the longitudinal center line of the connecting plate, and the longitudinal center line of the connecting plate and the longitudinal center line of the axial hole on the connecting ear are on the same vertical plane.

[0008] Furthermore, a sleeve is attached to the brake arm shaft, with its wheel surface resting against the inner edge of the shaft hole in the connecting ear. This converts the sliding friction of the pin sensor in the shaft hole into rolling friction between the sleeve and the inner edge of the shaft hole, significantly reducing the resulting frictional resistance, correspondingly increasing the service life of the component and the accuracy of brake friction force detection.

[0009] Furthermore, a support plate with a through hole is fixed to the connecting ear at the end of the shaft hole. The inner edge of the through hole in the support plate is lined with a wear-resistant strip. A shaft sleeve is connected to the brake arm shaft, and the wheel surface of the shaft sleeve rests on the wear-resistant strip. In this way, the support plate and wear-resistant strip can be used as support for the brake arm shaft during braking, thereby preventing the movement of the brake arm shaft from being stuck at the worn area due to wear on the inner edge of the shaft hole. This not only improves the detection accuracy of the braking friction force, but also correspondingly increases the service life.

[0010] The present invention provides a connecting plate that connects the brake arm shaft and the pin sensor, allowing the brake arm to be stably connected to the base through the brake arm shaft, the connecting plate, and the pin sensor. By forming the axial hole in the base through which the brake arm shaft passes into a vertical oblong hole, the brake arm shaft transmits all the force of slight vertical expansion and contraction to the connecting plate, and then to the pin sensor via the connecting plate. This allows the pin sensor to detect the braking friction force generated by the brake shoe pressing against the brake drum during braking, thereby achieving real-time detection of the brake friction force. The present invention is applicable to both drum brakes and disc brakes.

[0011] The present invention can also be implemented as follows: a force measuring brake, comprising a base and a brake arm hinged to the base through a brake arm shaft, the axial hole on the brake arm for passing the brake arm shaft is an oblong hole opened along the length of the brake arm, and a pin shaft hole is also opened on the brake arm, a pin shaft sensor is passed through the pin shaft hole, and a connecting plate is provided in the lower gap of the brake arm, the pin shaft sensor and the brake arm shaft are respectively passed through a circular through hole on the connecting plate, and the spacing between the two circular through holes on the connecting plate should make the axis center of the brake arm shaft in static state located at the center position of the length of the axial hole.

[0012] Furthermore, the connecting plate is used to transmit the braking friction force transmitted through the brake arm to the pin sensor, and the pin sensor is used to convert the force information into an electrical signal and send it outward.

[0013] Furthermore, the centers of the two circular through-holes on the connecting plate are located on the longitudinal center line of the connecting plate, and the longitudinal center line of the connecting plate and the longitudinal center line of the axial hole on the brake arm are on the same vertical plane.

[0014] Furthermore, a shaft sleeve is connected to the brake arm shaft, and a wheel surface of the shaft sleeve is pressed against the inner edge of the shaft hole on the brake arm.

[0015] Furthermore, a support plate with a through hole is fixed on the brake arm at the shaft hole end, a wear-resistant strip is lined on the inner edge of the through hole of the support plate, a shaft sleeve is connected to the brake arm shaft, and the wheel surface of the shaft sleeve is in contact with the wear-resistant strip.

[0016] The present invention can also be implemented as follows: a force measuring brake, comprising a brake arm and a brake shoe hinged to the brake arm through a brake shoe shaft, the axial hole on the brake arm for passing the brake shoe shaft is an oblong hole opened along the length of the brake arm, a pin shaft hole is opened on the brake arm, a pin shaft sensor is passed through the pin shaft hole, a connecting plate is provided in the gap in the brake arm, the pin shaft sensor and the brake shoe shaft are respectively passed through a circular through hole on the connecting plate, and the spacing between the two circular through holes on the connecting plate makes the axis center of the brake shoe shaft in static state located at the center position of the length of the axial hole.

[0017] Furthermore, the connecting plate is used to transmit the braking friction force transmitted through the brake shoe shaft to the pin shaft sensor, and the pin shaft sensor is used to convert the force information into an electrical signal and send it outward.

[0018] Furthermore, the centers of the two circular through-holes on the connecting plate are located on the longitudinal center line of the connecting plate, and the longitudinal center line of the connecting plate and the longitudinal center line of the axial hole on the brake arm are on the same vertical plane.

[0019] Furthermore, a shaft sleeve is connected to the brake shoe shaft, and a wheel surface of the shaft sleeve is in contact with the inner edge of the shaft hole on the brake arm.

[0020] Furthermore, a support plate with a through hole is fixed on the brake arm at the shaft hole end, a wear-resistant strip is lined on the inner edge of the through hole of the support plate, a shaft sleeve is connected to the brake shoe shaft, and the shaft sleeve is abutted against the wear-resistant strip.

[0021] The above-mentioned implementation method of the present invention is to provide a connecting plate that passes through the brake shoe shaft and the pin shaft sensor, so that the brake shoe shaft can be stably connected to the brake arm through the connecting plate and the pin shaft sensor; the axial hole on the brake arm that passes through the brake shoe shaft is opened into a vertical oblong hole, so that when the brake shoe shaft changes position in the vertical direction, the force that produces this change will be transmitted to the connecting plate, and then to the pin shaft sensor through the connecting plate. In this way, the pin shaft sensor can be used to detect the braking friction force generated by the brake shoe exerting pressure on the brake drum when the brake is applied, thereby realizing real-time detection of the braking friction force of the brake.

[0022] The present invention multiplies the detected braking friction force by the brake drum's radius (i.e., the braking friction force's action arm) to determine the magnitude of the brake torque. If the detected braking torque falls short of design specifications, a fault alarm or warning message is issued, prompting supervisory and maintenance personnel to implement countermeasures, promptly resolving brake failures and potential safety hazards, and ensuring the safe operation of the lifting equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural diagram of Example 1.

[0024] Figure 2 yes Figure 1 side view.

[0025] Figure 3 It is a structural diagram of Example 2.

[0026] Figure 4 yes Figure 2 side view.

[0027] Figure 5 It is a structural diagram of Example 3.

[0028] Figure 6 yes Figure 5 side view.

[0029] Figure 7 It is a structural diagram of Example 4.

[0030] Figure 8 yes Figure 7 side view.

[0031] Figure 9 It is a structural diagram of the connecting plate.

[0032] Figure 10 It is a schematic diagram of the local structure with support plates and wear strips installed at the shaft hole.

[0033] Figure 11 It is a schematic diagram of the matching structure of the shaft sleeve and the wear-resistant strip.

[0034] In the figure: 1. brake arm, 2. brake arm shaft, 3. shaft hole, 4. connecting plate, 5. brake shoe, 6. brake shoe shaft, 7. pin shaft sensor, 8. base, 9. connecting ear, 10. brake drum, 11. brake electromagnet, 12. brake spring, 13. brake rod, 14. connecting shaft, 15. frame, 16. hole, 17. limit ring, 18. bushing, 19. wear strip, 20. support plate. DETAILED DESCRIPTION

[0035] Example 1:

[0036] like Figure 1 、 Figure 2 As shown, a set of upwardly extending connecting ears 9 are provided at both ends of the brake base 8. The two brake arms 1 are respectively hinged to the connecting ears 9 at both ends of the base 8 through the brake arm shaft 2. The upper end of the brake arm 1 is hinged to the frame 15 through the connecting shaft 14. The hole 16 on the frame for the connecting shaft 14 is a horizontal oblong hole ( Figure 1 ) is used to absorb the lateral micro-displacement component generated by the brake arm during braking, ensuring that the vertical micro-displacement component generated by the brake arm during braking can be detected. This vertical micro-displacement component is the direction of the braking friction force generated by the brake shoe at the level of the brake shoe axis, reflecting the actual braking friction force exerted by the brake shoe against the brake drum. Common components such as the brake electromagnet 11, brake rod 13, and brake spring 12 are also connected to the frame 15. Brake shoes 5 are connected to the center of each brake arm 1. The two brake shoes 5 are positioned opposite each other, clamping the brake drum 10 on the lifting equipment between them.

[0037] There are three main improvements in this embodiment based on the above drum brake. First, the shaft hole 3 on the base connecting ear 9 through which the brake arm shaft 2 is connected is made into a vertical oblong hole ( Figure 1 ); Second, a connecting plate 4 is provided between the middle gap of the brake arm 1 and the base 8 ( Figure 2 ), and the upper end of the connecting plate 4 is positioned by passing through the brake arm shaft 2; thirdly, a pin hole is also opened on the base connecting ear 9, and the pin sensor 7 is passed through the hole ( Figure 2 ), to position the lower end of the connecting plate 4.

[0038] like Figure 9 As shown, the connecting plate 4 is a rectangular plate with two circular perforations on its surface, the centers of the two circular perforations are located on the long center line of the connecting plate 4, and the long center line of the connecting plate and the long center line of the axial hole 3 are on the same vertical plane to ensure the detection accuracy of the braking friction force. Figure 2In the figure, connecting plate 4 is vertically positioned between the middle gap at the lower end of brake arm 1 and the two connecting ears 9 on base 8. The circular perforation on its upper portion connects to brake arm shaft 2, while the circular perforation on its lower portion connects to pin sensor 7. Both ends of pin sensor 7 connect to connecting ears 9. The two circular perforations on connecting plate 4 are spaced such that the axis of brake arm shaft 2 is located at the longitudinal center of shaft hole 3 in the static state, leaving space for upward or downward movement of brake arm shaft 2. A limit ring 17 is connected to the end of the pin sensor.

[0039] like Figure 10 、 Figure 11 As shown, a support plate 20 is fixed to the outer surface of the connecting lug 9 at the end of the shaft hole 3. A rectangular through-hole is formed in the surface of the support plate 20, and the oblong shaft hole 3 in the connecting lug 9 is located within the rectangular through-hole. A wear strip 19 is placed on one side of the inner edge of the through-hole of the support plate 20, i.e., the side where the brake arm shaft applies braking pressure. The width of the wear strip 19 is no greater than the thickness of the connecting lug 9, and the outer edge of the wear strip 19 is flush with the end face of the connecting lug 9, with the length of the wear strip 19 aligned with the length of the shaft hole 3. If a support plate is not provided, the wear strip 19 can be directly installed on one side of the inner edge of the shaft hole 3.

[0040] A sleeve 18 is sleeved onto the brake arm shaft 2. The axial length of sleeve 18 is no greater than the width of wear strips 19, creating a sliding fit between sleeve 18 and brake arm shaft 2. The sheath of sleeve 18 rests against the wear strips 19 on support plate 20. If no support plate is provided, the sheath of sleeve 19 rests against the inner edge of shaft hole 3 in connecting lug 9 or against the wear strips within shaft hole 3. This transforms the sliding fit of brake arm shaft 2 in shaft hole 3 into a rolling fit, thereby preventing wear on brake arm shaft 2 or shaft hole 3.

[0041] When the brake is applied, the brake shoe 8 drives the brake arm 1 via the brake shoe shaft 6 to produce a slight displacement. This slight displacement of the brake arm 1 can be decomposed into a lateral slight displacement component and a vertical slight displacement component. The lateral slight displacement component of the brake arm 1 is absorbed and dissolved by the lateral oblong hole on the frame, while the vertical slight displacement component of the brake arm 1 drives the brake arm shaft 2 to pass unimpeded through the axial hole 3 of the base 8 and is completely transferred to the pin sensor 7 via the connecting plate 4. The pin sensor 7 sends the above force information in the form of an electrical signal or a digital signal. This force information can be regarded as the braking friction force generated by the brake. The product of this braking friction force and the radius of the brake drum is the numerical value of the braking torque of this drum brake during each braking.

[0042] Example 2:

[0043] like Figure 3 、 Figure 4As shown, the overall structure of this embodiment is essentially the same as that of Example 1. The differences are that: 1. the axial hole 3 on the brake arm 1 for receiving the brake arm shaft 2 is formed as an oblong hole extending along the length of the brake arm, while the axial hole on the base connecting ear 9 for receiving the brake arm shaft 2 remains a circular hole; 2. a pin hole is also formed on the brake arm 1, and the brake arm shaft 2 is received through the lower circular hole of the connecting plate 4. The pin sensor 7 is received through the pin hole in the brake arm 1 and the upper circular hole of the connecting plate 4. The operating process and principle of this embodiment are the same as those of Example 1.

[0044] Example 3:

[0045] like Figure 5 、 Figure 6 As shown, this embodiment is also a drum brake with a structure basically the same as that of embodiment 1. The lower end of the brake arm 1 is hinged to the connecting ear 9 of the base 8 in a conventional manner. The upper end of the brake arm 1 is hinged to the frame 15 through the connecting shaft 14 and the transverse oblong hole in the same manner as embodiment 1. The shaft hole 3 on the brake arm 1 for receiving the brake shoe shaft 6 is a vertical oblong hole ( Figure 6 ), the connection hole in the brake shoe 8 is a circular hole. A pin hole is provided in the brake arm 1, into which a pin sensor 7 is inserted. A connecting plate 4, identical in structure to that of Example 1, is located in the central gap of the brake arm 1. The pin sensor 7 is inserted into the upper circular hole of the connecting plate 4, and the brake shoe shaft 6 is inserted into the lower circular hole of the connecting plate 4. The spacing between the two circular holes in the connecting plate 4 is such that the axis of the brake shoe shaft 6 is located at the longitudinal center of the shaft hole 3 in the static state.

[0046] See Figure 10 、 Figure 11 The axial hole 3 in the brake arm 1 is a vertical oblong hole. A support plate 20 is fixed to the outer surface of the brake arm 1 at the end of the axial hole 3. A rectangular through-hole is formed on the surface of the support plate 20, and the oblong axial hole 3 in the brake arm 1 is located within the rectangular through-hole. A wear strip 19 is placed on one side of the inner edge of the through-hole in the support plate 20, i.e., the side where the brake shoe shaft is subjected to braking pressure. The width of the wear strip 19 is no greater than the thickness of the brake arm 1, and the outer edge of the wear strip 19 is flush with the end face of the brake arm 1. The length of the wear strip 19 is aligned with the length of the axial hole 3. If a support plate is not provided, the wear strip 19 can be directly installed on one side of the inner edge of the axial hole 3.

[0047] A sleeve 18 is sleeved onto the brake shoe arm shaft 6. The axial length of the sleeve 18 is no greater than the width of the wear strips 19, creating a sliding fit between the sleeve 18 and the brake shoe arm shaft 6. The sheath of the sleeve 18 rests against the wear strips 19 on the support plate 20. If no support plate is provided, the sheath of the sleeve 19 rests against the inner edge of the shaft hole 3 in the connecting lug 9 or against the wear strips within the shaft hole 3. This transforms the sliding fit of the brake shoe arm shaft 6 in the shaft hole 3 into a rolling fit, thereby preventing wear on the brake arm shaft 2 or the shaft hole 3.

[0048] When the brake is applied, the brake shoe 8 causes the brake shoe shaft 6 to produce a slight displacement. This slight displacement of the brake shoe shaft 6 can be decomposed into a lateral slight displacement component and a vertical slight displacement component. The lateral slight displacement component of the brake shoe shaft 6 passes through the brake arm 1 and is absorbed and dissolved by the lateral oblong hole 16 on the frame 15. The vertical slight displacement component of the brake shoe shaft 6 passes unimpeded through the axial hole 3 of the brake arm 1 and is completely transferred to the pin sensor 7 through the connecting plate 4. The pin sensor 7 sends the above force information in the form of an electrical signal or a digital signal. This force information can be regarded as the braking friction force generated by the brake. The product of this braking friction force and the radius of the brake drum is the numerical value of the braking torque of this drum brake during each braking.

[0049] Example 4:

[0050] like Figure 7 、 Figure 8 As shown, the overall structure of this embodiment is essentially the same as that of Embodiment 3, except that the pin hole for mounting the pin sensor is located above the brake shoe shaft hole in brake arm 1, the brake shoe shaft 6 is inserted into the lower circular through-hole of connecting plate 4, and the pin sensor 7 is inserted into both the pin hole in brake arm 1 and the upper circular through-hole in connecting plate 4. The operating process and principle of this embodiment are the same as those of Embodiment 3.

Claims

1. A force-measuring brake, wherein a pair of upwardly extending connecting ears are provided at each end of the brake base, wherein the connecting ears have an axial hole for receiving the brake arm shaft, and the brake arm and the connecting ears are hingedly connected via the brake arm shaft, wherein: The upper end of the brake arm is hinged to the frame through a connecting shaft, and the hole on the frame through which the connecting shaft is passed is a transverse oblong hole, which is used to absorb the transverse micro-displacement component generated by the brake arm during braking; the axial hole on the connecting ear of the base for passing the brake arm shaft is an oblong hole opened along the length of the brake arm, and a pin shaft hole is also opened on the base, and a pin shaft sensor is passed through the pin shaft hole, and a connecting plate is provided in the lower gap of the brake arm, and the pin shaft sensor and the brake arm shaft are respectively passed through a circular through hole on the connecting plate, and the spacing between the two circular through holes on the connecting plate should make the axis center of the brake arm shaft in the static state located at the center position of the length of the through hole.

2. The dynamometric brake according to claim 1, wherein: The connecting plate is used to transmit the braking friction force transmitted through the brake arm to the pin sensor, and the pin sensor is used to convert the force information into an electrical signal and send it outward.

3. The dynamometric brake according to claim 1, wherein: The centers of the two circular through-holes on the connecting plate are located on the longitudinal center line of the connecting plate, and the longitudinal center line of the connecting plate and the longitudinal center line of the axial hole on the connecting ear are on the same vertical plane.

4. The dynamometric brake according to claim 1, 2 or 3, wherein A shaft sleeve is connected to the brake arm shaft, and a wheel surface of the shaft sleeve is pressed against the inner edge of the shaft hole on the connecting ear.

5. The dynamometric brake according to claim 1, 2 or 3, characterized in that: A support plate with a through hole is fixed on the connecting ear at the end of the shaft hole, a wear-resistant strip is lined on the inner edge of the through hole of the support plate, a shaft sleeve is connected to the brake arm shaft, and the wheel surface of the shaft sleeve is in contact with the wear-resistant strip.

6. A force-measuring brake comprising a base and a brake arm hingedly connected to the base via a brake arm shaft, characterized in that: The upper end of the brake arm is hinged to the frame through a connecting shaft, and the hole on the frame through which the connecting shaft is passed is a transverse oblong hole, which is used to absorb the transverse micro-displacement component generated by the brake arm during braking; the axial hole on the brake arm through which the brake arm shaft is passed is an oblong hole opened along the length of the brake arm, and a pin shaft hole is also opened on the brake arm, and a pin shaft sensor is passed through the pin shaft hole, and a connecting plate is provided in the lower gap of the brake arm, and the pin shaft sensor and the brake arm shaft are respectively passed through a circular through hole on the connecting plate, and the spacing between the two circular through holes on the connecting plate should make the axis center of the brake arm shaft in the static state located at the center position of the length of the through hole.

7. The dynamometric brake according to claim 6, characterized in that: The connecting plate is used to transmit the braking friction force transmitted through the brake arm to the pin sensor, and the pin sensor is used to convert the force information into an electrical signal and send it outward.

8. The dynamometric brake according to claim 6, wherein: The centers of the two circular through-holes on the connecting plate are located on the longitudinal center line of the connecting plate, and the longitudinal center line of the connecting plate and the longitudinal center line of the axial hole on the brake arm are on the same vertical plane.

9. The dynamometric brake according to claim 6, 7 or 8, wherein A shaft sleeve is connected to the brake arm shaft, and a wheel surface of the shaft sleeve is pressed against the inner edge of the shaft hole on the brake arm.

10. The dynamometric brake according to claim 6, 7 or 8, characterized in that: A support plate with a through hole is fixed on the brake arm at the shaft hole end, a wear-resistant strip is padded on the inner edge of the through hole of the support plate, a shaft sleeve is connected to the brake arm shaft, and the wheel surface of the shaft sleeve is in contact with the wear-resistant strip.

11. A dynamometric brake comprising a brake arm and a brake shoe hingedly connected to the brake arm via a brake shoe shaft, wherein: The upper end of the brake arm is hinged to the frame through a connecting shaft, and the hole on the frame through which the connecting shaft is passed is a transverse oblong hole, which is used to absorb the transverse micro-displacement component generated by the brake arm during braking; the axial hole on the brake arm through which the brake shoe shaft is passed is an oblong hole opened along the length of the brake arm, and a pin shaft hole is also opened on the brake arm, in which a pin shaft sensor is passed, and a connecting plate is provided in the gap of the brake arm, and the pin shaft sensor and the brake shoe shaft are respectively passed through a circular through hole on the connecting plate, and the spacing between the two circular through holes on the connecting plate should make the axis center of the brake shoe shaft in the static state located at the center position of the length of the axial hole.

12. The dynamometric brake according to claim 11, characterized in that: The connecting plate is used to transmit the braking friction force transmitted through the brake shoe shaft to the pin shaft sensor, and the pin shaft sensor is used to convert the force information into an electrical signal and send it outward.

13. The dynamometric brake according to claim 11, wherein: The centers of the two circular through-holes on the connecting plate are located on the longitudinal center line of the connecting plate, and the longitudinal center line of the connecting plate and the longitudinal center line of the axial hole on the brake arm are on the same vertical plane.

14. The dynamometric brake according to claim 11, 12 or 13, characterized in that: A shaft sleeve is connected to the brake shoe shaft, and a wheel surface of the shaft sleeve is pressed against the inner edge of the shaft hole on the brake arm.

15. The dynamometric brake according to claim 11, 12 or 13, characterized in that: A support plate with a through hole is fixed on the brake arm at the shaft hole end, a wear-resistant strip is padded on the inner edge of the through hole of the support plate, a shaft sleeve is connected to the brake shoe shaft, and the wheel surface of the shaft sleeve is in contact with the wear-resistant strip.

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