A connection device for a flexible tube and a rigid tube

Abstract

This utility model provides a connection device for flexible hoses and rigid conduits, belonging to the field of conduit connection devices. The device includes a fixing block, with a retaining sleeve fixed to one end and a flexible clamping member connected to the other end. A screw is connected to the other end of the clamping member, and a locking device is threaded onto the screw. The retaining sleeve has an opening for the screw to enter and exit radially. The retaining sleeve includes a large-diameter section and a small-diameter section, with the large-diameter section located at the end of the small-diameter section away from the curved surface. One axial end of the locking device is a limiting end that can extend into the large-diameter section. The width of the opening is smaller than the outer diameter of the limiting end to prevent the limiting end from radially disengaging from the opening. In this utility model, the retaining sleeve provides radial limitation for the limiting end, preventing it from radially disengaging from the retaining sleeve, thereby improving the reliability of the connection device for flexible hoses and rigid conduits.

Description

Technical Field

[0001] This utility model belongs to the field of pipeline connection devices, and in particular relates to a connection device for flexible hoses and rigid pipelines. Background Technology

[0002] Cement is a crucial material in oil well cementing engineering. The pipelines used to transport cement at construction sites include interconnected flexible hoses and rigid pipes. The flexible hoses are fitted over the rigid pipes and secured with clamps. These clamps, fastened with bolts, are inconvenient to install and remove. Cement is transported using compressed air introduced into the pipelines. The high-pressure environment within the pipelines subjects the connection between the flexible hose and the rigid pipe to significant tensile forces. The clamps, however, offer weak fixation and poor reliability, making them prone to cement leakage and even hose detachment.

[0003] To address the aforementioned technical problems, utility model patent CN220435726U discloses a connecting device suitable for hoses used in powder tank trucks. This connecting device includes a fixing block, a chain, and a tightening device. The fixing block has an arc-shaped structure for fitting against the outer surface of the pipeline. One end of the fixing block is fixed with a clamp (i.e., a retainer), and the other end is connected to the chain. The other end of the chain is connected to a lead screw, which passes through the clamp and connects to the tightening device. The tightening device includes a hollow tightening rod, one end of which has a tightening device with a threaded hole that mates with the lead screw. The end of the tightening rod away from the tightening device has a handle for rotating the tightening rod. In use, the chain and fixing block are clamped around the outside of the hose, and then the tightening device is rotated to tighten the lead screw, thereby driving the chain to clamp the hose to the rigid pipeline. This connecting device is easy to operate, and the flexible chain allows for a more reliable connection between the hose and the rigid pipeline, preventing ash leakage and hose detachment.

[0004] The aforementioned connecting device has an opening on one side of the ferrule for the lead screw to enter and exit. During use, because the ferrule cannot radially restrict the lead screw and tightening device, if the tightening device or lead screw is accidentally subjected to radial force, the tightening device and ferrule will slide radially relative to each other. This can easily cause the lead screw to disengage from the opening on the ferrule, resulting in connection failure. Furthermore, during tightening, the torque applied by the operator to the tightening device is uneven, which can easily cause radial displacement of the tightening device and lead screw. Radial displacement of the lead screw can easily collide with the inner surface of the ferrule, damaging the threads of the lead screw and affecting the service life of the connecting device. Utility Model Content

[0005] The purpose of this utility model is to provide a connection device for flexible hoses and rigid hoses, so as to solve the technical problem in the prior art that the locking device is prone to causing the lead screw to come out of the opening on the sleeve when subjected to external force, thus causing the connection device to fail.

[0006] To achieve the above objectives, the technical solution of the connection device between flexible conduit and rigid conduit provided by this utility model is as follows:

[0007] A connection device for connecting a flexible hose to a rigid conduit includes a fixing block. One end of the fixing block is fixed with a ferrule, and the other end is connected to a flexible clamping member. The fixing block also has an arc-shaped surface for fitting against the outer side of the flexible hose. The arc-shaped surface is located between the two ends of the fixing block where the ferrule and the clamping member are located. The other end of the clamping member is connected to a screw, and a locking device is threaded onto the screw. The ferrule has an opening for the screw to enter and exit radially. The ferrule includes a large-diameter section with a larger inner diameter and a small-diameter section with a smaller inner diameter. The large-diameter section is located at the end of the small-diameter section away from the arc-shaped surface. One axial end of the locking device is a limiting end that can extend into the large-diameter section. The width of the opening is smaller than the outer diameter of the limiting end so that the limiting end cannot be dislodged radially from the opening.

[0008] As a further improvement, the difference between the outer diameter of the limiting end and the inner diameter of the large diameter section is smaller than the difference between the outer diameter of the screw and the inner diameter of the small diameter section.

[0009] As a further improvement, the locking device includes a main body, a limiting end located at one axial end of the main body, the outer diameter of the limiting end being smaller than the outer diameter of the main body, a pressing step forming at the junction of the main body and the limiting end, the axial length of the limiting end being less than or equal to the axial length of the large diameter section, and the outer diameter of the main body being larger than the inner diameter of the large diameter section so that the step surface of the pressing step can be axially pressed and fitted with the end face of the large diameter section away from the small diameter section.

[0010] As a further improvement, the locking device has a uniform outer diameter structure, with a stop step formed between the large diameter section and the small diameter section. The end face of the limiting end of the locking device can be axially pressed and engaged with the step surface of the stop step.

[0011] As a further improvement, the width of the opening is equal to the inner diameter of the minor diameter section.

[0012] As a further improvement, a transition slope is provided between the end face of the fixing block and the arc-shaped surface at one end of the retaining sleeve. The transition slope faces the outside of the fixing block and can guide the inside of the clamping member during use.

[0013] As a further improvement, the tangent surface at the intersection of the curved surface and the transition slope is used as the reference tangent surface, and the angle between the transition slope and the reference tangent surface ranges from 40° to 70°.

[0014] As a further improvement, the intersection of the transition slope and the arc surface, as well as the intersection of the transition slope and the end face where the ferrule on the fixing block is located, are all rounded.

[0015] As a further improvement, the axial direction of the arc surface is taken as the width direction of the fixing block, and flanges that protrude along the width direction of the fixing block are provided at the edges of the two end faces in the width direction of the fixing block. The flanges are provided at least at the position of the arc surface of the fixing block to increase the area of ​​the arc surface.

[0016] As a further improvement, flanges are provided at all edges of both ends of the fixing block in the width direction. The flanges at the locations of the arc-shaped surfaces and the flanges at the end faces of the fixing blocks where the ferrules are installed are larger in width than the flanges at other locations.

[0017] The beneficial effects are as follows: The connection device for connecting flexible hoses and rigid conduits provided by this utility model is an improvement on the prior art. In this connection device, the limiting end of the locking device can extend into the large-diameter section of the ferrule. Furthermore, since the opening width on the ferrule is smaller than the outer diameter of the limiting end, the ferrule can provide radial limitation for the limiting end during use, preventing the limiting end from disengaging radially from the ferrule. This improves the reliability of the connection device for connecting flexible hoses and rigid conduits. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the connection device between flexible hose and rigid conduit in this utility model;

[0019] Figure 2 This is a front view of Embodiment 1 of the connection device between flexible hose and rigid conduit in this utility model;

[0020] Figure 3 This is a cross-sectional view of Embodiment 1 of the connection device between flexible hose and rigid conduit in this utility model;

[0021] Figure 4 This is a partial structural diagram of the tightening member in Embodiment 1 of the connection device between the flexible hose and the rigid hose of this utility model;

[0022] Figure 5 This is a partial structural diagram of the ferrule in Embodiment 1 of the connection device between the flexible hose and the rigid hose of this utility model;

[0023] Figure 6 This is a top view of the ferrule in Embodiment 1 of the connection device between the flexible hose and the rigid conduit of this utility model;

[0024] Figure 7 This is a cross-sectional view of the ferrule in Embodiment 1 of the connection device between the flexible hose and the rigid hose of this utility model;

[0025] Figure 8 This is a schematic diagram of the usage state of Embodiment 1 of the connection device between flexible hose and rigid conduit in this utility model.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Fixing block; 11. Arc-shaped surface; 12. Transition slope; 13. Flange; 2. Chain; 3. Tightening component; 31. Locking device; 311. Main body; 312. Limiting end; 313. Top pressure step; 32. Connecting rod; 33. Handle rod; 4. Screw; 5. Sleeve; 51. Opening; 52. Large diameter section; 53. Small diameter section; 54. Stopping step; 6. Flexible hose; 7. Rigid hose; 8. Opening area. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to the embodiments.

[0029] Specific embodiment 1 of the connection device for flexible hoses and rigid hoses provided by this utility model:

[0030] A connection device for connecting flexible conduit and rigid conduit, see attached document. Figure 1 It includes a fixing block 1, a clamping component and a tightening component 3.

[0031] Combined with appendix Figure 2 and attached Figure 3 The fixing block 1 is provided with an arc-shaped surface 11 for fitting against the outer side of the flexible hose. The width direction of the fixing block 1 is in the same direction as the axis of the arc-shaped surface 11. The cross-sectional profile of the fixing block 1 perpendicular to the width direction includes two straight edges that are perpendicular to each other and intersect at their endpoints, and an arc-shaped edge located between the two straight edges. The arc-shaped edge is concave and corresponds to the arc-shaped surface 11. The two straight edges correspond to two flat surfaces that are perpendicular to each other on the fixing block 1.

[0032] The clamping element is specifically a chain 2, and it is a strip-shaped, torsion-resistant roller chain. In other embodiments of this example, the clamping element may also be a steel strip or wire rope capable of elastic deformation.

[0033] One end of the chain 2 is hinged to the fixing block 1 via a pin, and the other end is hinged to a screw 4. The chain 2 is connected to the fixing block 1 at the intersection of one of the flat side surfaces and the arc-shaped surface 11. A retainer 5 is fixedly installed on the other flat side surface. The retainer 5 and the chain 2 can be regarded as being respectively installed at both ends of the fixing block 1. The aforementioned two ends are the two ends of the fixing block 1 in the direction perpendicular to the flat side surface where the retainer 5 is located.

[0034] The tightening component 3 includes a locking device 31, a connecting rod 32, and a handle rod 33. The locking device 31 and the handle rod 33 are respectively fixed to both ends of the connecting rod 32. The locking device 31 is coaxially arranged with the connecting rod 32, and the handle rod 33 is perpendicular to the connecting rod 32. The locking device 31 is provided with a threaded hole that can be threaded into the screw 4. The connecting rod 32 is a hollow round tube, and the inner cavity of the connecting rod 32 communicates with the threaded hole of the locking device 31. The inner cavity size of the connecting rod 32 is larger than the outer diameter size of the screw 4, so that the screw 4 can be axially inserted into the connecting rod 32.

[0035] The ferrule 5 has an opening 51 for the screw 4 to enter and exit radially. During use, the screw 4 is always threadedly engaged with the threaded hole on the locking device 31. When connecting the flexible hose 6 and the rigid hose 7, refer to the attached... Figure 8 First, the flexible hose 6 is placed on the outside of the rigid hose 7. Then, the chain 2 and the fixing block 1 are clamped on the outside of the flexible hose. Next, the screw 4 is radially inserted into the ferrule 5 through the opening 51 on the ferrule 5, and the locking device 31 is positioned at the end of the ferrule 5 away from the arc surface 11. The ferrule 5 can axially limit the locking device 31. By rotating the handle rod 33 to rotate the locking device 31, the screw 4 can be axially tightened, thereby tightening the chain 2 on the flexible hose.

[0036] See appendix Figure 4 The locking device 31 includes a main body 311 and a limiting end 312. The limiting end 312 is located at the end of the main body 311 that is axially away from the connecting rod 32. The outer diameter of the limiting end 312 is smaller than the outer diameter of the main body 311. A pressing step 313 is formed at the junction of the main body 311 and the limiting end 312. The step surface of the pressing step 313 is perpendicular to the axial direction of the locking device 31 and faces away from the connecting rod 32.

[0037] See appendix Figure 5 and in conjunction with the appendix Figure 6 and attached Figure 7 The ferrule 5 includes a large-diameter section 52 with a larger inner diameter and a small-diameter section 53 with a smaller inner diameter. The large-diameter section 52 is located at the end of the small-diameter section 53 away from the arc surface 11. The width of the opening 51 on the ferrule 5 is equal to the inner diameter of the small-diameter section 53. A stop step 54 is formed at the junction of the large-diameter section 52 and the small-diameter section 53. The step surface of the stop step 54 is perpendicular to the axis of the ferrule 5 and faces away from the arc surface 11.

[0038] The limiting end 312 can be inserted into the large diameter section 52, and the limiting end 312 is clearance-fitted with the inner hole of the large diameter section 52 for easy assembly and use. The outer diameter of the limiting end 312 is larger than the inner diameter of the small diameter section 53, that is, the outer diameter of the limiting end 312 is larger than the width of the opening 51 on the sleeve 5. In this way, after the limiting end 312 is installed in the large diameter section 52, it cannot be radially dislodged through the opening 51 on the sleeve 5, ensuring the stability and reliability of the locking device 31 during use and preventing accidental loosening.

[0039] The outer diameter of the limiting end 312 is smaller than the inner diameter of the large diameter section 52, and the outer diameter of the screw 4 is smaller than the inner diameter of the small diameter section 53. Furthermore, the difference between the outer diameter of the limiting end 312 and the inner diameter of the large diameter section 52 is smaller than the difference between the outer diameter of the screw 4 and the inner diameter of the small diameter section 53. In this way, the cooperation between the limiting end 312 and the large diameter section 52 can also play a role in radially limiting the screw 4, preventing the screw 4 from contacting the inner side of the small diameter section 53 during use, thereby preventing the threads on the screw 4 from being damaged or worn by collision, and effectively improving the service life of the connection device between the flexible hose and the rigid pipeline.

[0040] The outer diameter of the main body 311 of the locking device 31 is larger than the inner diameter of the large diameter section 52 of the ferrule 5. The axial length of the limiting end 312 is equal to the axial length of the large diameter section 52. Thus, after the limiting end 312 is inserted into the large diameter section 52, the step surface of the pressing step 313 on the locking device 31 can be axially pressed against the end face of the large diameter section 52 away from the small diameter section 53 of the ferrule 5. At the same time, the end face of the limiting end 312 away from the main body 311 can be pressed against the step surface of the stop step 54 on the ferrule 5. The locking device 31 and the ferrule 5 have a large pressing contact area, which is beneficial for the smooth rotation of the locking device 31 during use.

[0041] Combined with appendix Figure 8 A transition slope 12 is provided between the flat side of the sleeve 5 on the fixing block 1 and the arc-shaped surface 11, with the transition slope 12 facing the outside of the fixing block 1. When tightening the pipeline, the fixing block 1 and the chain 2 can form a ring structure. In this embodiment, the inner and outer sides specifically refer to the inner and outer sides of the ring structure. For the fixing block 1, its arc-shaped surface 11 faces the inner side, and the other sides face the outer side.

[0042] Compared to existing technologies, this connecting device eliminates the original weak end by setting a transition slope 12 on the fixed block 1. The part between the transition slope 12 and the arc surface 11 is thicker than the original weak end, and the corresponding edge angle is also larger. On the one hand, the fixed block 1 is no longer easy to deform, and on the other hand, it is no longer easy to cut the hose and personnel.

[0043] After removing the original weak end, there is a certain gap 8 between the position where the chain 2 contacts the hose 6 and the position where it contacts the fixing block 1, where the hose 6 cannot be directly compressed. Setting the transition slope 12 can effectively reduce the range of the gap 8.

[0044] If simply move the original weak end of the fixing block 1 along... Figure 8 Removing the dotted line would result in right-angled edges on the fixing block 1. Since the inner side of the chain 2 is uneven, it would slide relative to the fixing block 1 during tightening. The right-angled edges would easily get stuck on the uneven structure of the chain 2's inner side, making it difficult to tighten the chain smoothly. By setting the transition slope 12, the transition slope 12 and the corresponding flat side of the fixing block 1 form an obtuse angle, creating a smooth transition. During tightening, the inner side of the chain 2 is guided by the transition slope 12, reducing the likelihood of chain jamming and improving the user experience.

[0045] Furthermore, after removing the original weak end of the fixing block 1, the corresponding edge of the fixing block 1 will be subjected to inward compressive force from the chain 2. If the weak end along... Figure 8 If the dotted line at point A is removed, the thickness of the end face corresponding to that dotted line will be relatively small, making it prone to deformation or even cracking during long-term use; if the weak end is along Figure 8 Removing the dotted line at point B, although the thickness of the end face corresponding to the dotted line is relatively large, will also increase the size of the empty area 8, which may lead to a poorer clamping effect. However, by setting the transition slope 12, both of the above problems can be addressed, ensuring that the fixing block 1 has good strength, while also providing a good clamping effect on the pipeline.

[0046] The cross-section of the arc-shaped surface 11 at the intersection with the transition slope 12 is the reference cross-section. The angle between the transition slope 12 and the reference cross-section ranges from 40° to 70°. This ensures that the edges between the transition slope 12 and the arc-shaped surface 11 are not too sharp, guaranteeing that the part between the transition slope 12 and the arc-shaped surface 11 has high strength, while minimizing the size of the empty area 8 to ensure the clamping effect.

[0047] All edges of both ends of the fixing block 1 in the width direction are provided with flanges 13 that protrude in the width direction of the fixing block 1. The flanges 13 can widen the edges of the fixing block 1, which can enhance the strength of the fixing block 1 while adding little weight to the fixing block 1. Moreover, the flanges 13 on the same side of the fixing block 1 are approximately triangular in structure, which further enhances the load-bearing capacity of the fixing block 1.

[0048] The flange 13 corresponding to the arc-shaped surface 11 increases the area of ​​the arc-shaped surface 11, thereby increasing the clamping area of ​​the fixing block 1 on the hose and preventing the hose from being directly cut off when the narrow fixing block 1 clamps the hose. In other embodiments, the flange 13 can be provided only at the position corresponding to the arc-shaped surface 11, and the flange 13 can be not provided at other positions, which can also achieve the above purpose.

[0049] The main stress-bearing locations on the fixing block 1 are the arc-shaped surface 11 and the flat side where the sleeve 5 is located. Therefore, in this embodiment, the flange 13 corresponding to the arc-shaped surface 11 and the flange 13 corresponding to the flat side of the fixing block 1 where the sleeve 5 is located are wider than the flanges 13 at other locations. This not only ensures sufficient strength for the fixing block 1 but also ensures a relatively low weight for the fixing block 1. In other embodiments of this embodiment, the width of the flanges 13 at each edge of the fixing block 1 can also be equal.

[0050] Specific embodiment 2 of the connection device for flexible hoses and rigid hoses provided by this utility model:

[0051] This embodiment is based on Embodiment 1. The difference between this embodiment and Embodiment 1 is that the intersection of the transition slope and the arc surface in this embodiment is rounded, and the intersection of the transition slope and the flat side where the ferrule on the fixing block is located is also rounded.

[0052] Rounding the corners can further prevent sharp edges from cutting people or hoses, and also reduce the resistance of the chain and the fixing block sliding relative to each other during the tightening process, thus improving ease of use.

[0053] Specific embodiment 3 of the connection device for flexible hoses and rigid hoses provided by this utility model:

[0054] This embodiment is based on Embodiment 1, but differs in that the fixing block in this embodiment does not have a flange. To prevent the flexible hose from being directly cut by the fixing block, the overall width of the fixing block can be widened.

[0055] Specific embodiment 4 of the connection device for flexible hoses and rigid hoses provided by this utility model:

[0056] This embodiment is based on Embodiment 1. The difference between this embodiment and Embodiment 1 is that in this embodiment, the opening width on the sleeve is smaller than the inner diameter of the small diameter section. This also enables the large diameter section to limit the limiting end in the radial direction.

[0057] Specific embodiment 5 of the connection device for flexible hoses and rigid hoses provided by this utility model:

[0058] This embodiment is based on Embodiment 1. The difference between this embodiment and Embodiment 1 is that in this embodiment, the locking device is a uniform diameter structure with a uniform outer diameter, the axial end of the locking device constitutes a limiting end, and the axial end face of the locking device is pressed against the step surface of the stop step on the sleeve in a circumferential manner.

[0059] Compared to Example 1, the contact area between the locking device and the ferrule in this example is smaller, but it can still tighten the chain and limit the radial movement of the ferrule on the locking device.

[0060] Specific embodiment 6 of the connection device for flexible hoses and rigid hoses provided by this utility model:

[0061] This embodiment is based on Embodiment 1. The difference between this embodiment and Embodiment 1 is that the axial length of the limiting end is less than the axial length of the large diameter section of the ferrule. The locking device only presses against the step surface of the step and the end face of the ferrule. The limiting end of the locking device only plays the role of radial limiting by cooperating with the ferrule.

[0062] Compared to Example 1, the contact area between the locking device and the ferrule in this example is smaller, but it can still tighten the chain and limit the radial movement of the ferrule on the locking device.

[0063] Finally, it should be noted that the above description is only a preferred embodiment of this utility model and is not intended to limit this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A connection device for a flexible conduit and a rigid conduit, comprising a fixing block, a retaining sleeve fixed to one end of the fixing block, and a flexible clamping member connected to the other end of the fixing block. The fixing block also has an arc-shaped surface for contacting the outer surface of the flexible conduit, the arc-shaped surface being located between the two ends of the fixing block where the retaining sleeve and the clamping member are located. A screw is connected to the other end of the clamping member, and a locking device is threaded onto the screw. The retaining sleeve has an opening for the screw to radially enter and exit. The device is characterized in that... The ferrule includes a large-diameter section with a larger inner diameter and a small-diameter section with a smaller inner diameter. The large-diameter section is located at the end of the small-diameter section away from the arc surface. The axial end of the locking device is a limiting end that can extend into the large-diameter section. The width of the opening is smaller than the outer diameter of the limiting end so that the limiting end cannot be dislodged radially from the opening.

2. The connection device for flexible hoses and rigid conduits according to claim 1, characterized in that, The difference between the outer diameter of the limiting end and the inner diameter of the large diameter section is less than the difference between the outer diameter of the screw and the inner diameter of the small diameter section.

3. The connection device for flexible conduit and rigid conduit according to claim 1 or 2, characterized in that, The locking device includes a main body and a limiting end located at one axial end of the main body. The outer diameter of the limiting end is smaller than the outer diameter of the main body. A pressing step is formed at the junction of the main body and the limiting end. The axial length of the limiting end is less than or equal to the axial length of the large diameter section. The outer diameter of the main body is larger than the inner diameter of the large diameter section so that the step surface of the pressing step can be axially pressed and fitted with the end face of the large diameter section away from the small diameter section.

4. The connection device for flexible conduit and rigid conduit according to claim 1 or 2, characterized in that, The locking device has a uniform outer diameter structure, with a stop step formed between the large diameter section and the small diameter section. The end face of the limiting end of the locking device can be axially pressed and engaged with the step surface of the stop step.

5. The connection device for flexible conduit and rigid conduit according to claim 1 or 2, characterized in that, The width of the opening is equal to the inner diameter of the minor diameter section.

6. The connection device for flexible conduit and rigid conduit according to claim 1 or 2, characterized in that, A transition slope is provided between the end face of the fixing block and the arc-shaped surface at one end of the clamping sleeve. The transition slope faces the outside of the fixing block and can guide the inside of the clamping part during use.

7. The connection device for flexible hoses and rigid conduits according to claim 6, characterized in that, The tangent surface at the intersection of the curved surface and the transition slope is the reference tangent surface, and the angle between the transition slope and the reference tangent surface ranges from 40° to 70°.

8. The connection device for flexible hose and rigid conduit according to claim 6, characterized in that the transition... The intersections of the inclined plane and the curved surface, as well as the intersections of the transition inclined plane and the end face where the ferrule on the fixing block is located, are all rounded.

9. The connection device for flexible conduit and rigid conduit according to claim 1 or 2, characterized in that, The axial direction of the arc surface is taken as the width direction of the fixing block. Flanges that protrude along the width direction of the fixing block are provided at the edges of the two end faces of the fixing block. The flanges are provided at least at the position of the arc surface of the fixing block to increase the area of ​​the arc surface.

10. The connection device for flexible conduit and rigid conduit according to claim 9, characterized in that, Flanges are provided at all edges of both ends of the fixing block in the width direction. The flanges at the locations of the arc-shaped surfaces and the flanges at the end faces of the fixing blocks where the ferrules are installed are larger in width than the flanges at other locations.

Images